April 2014 - BNC-all - ecn.purdue.edu

BNC e-news for the week of April 28th
by Anthrop, Heather L 25 Apr '14

25 Apr '14

Graduation Party Lab Reminder Preliminary Exam Survey Feedback Graduation Party Please join us in celebrating the accomplishments of our Spring 2014 graduating class. Friday, May 2nd at 3:30 pm Birck Atrium Cake will be served. If you are graduating and have not yet told Heather (hanthrop(a)purdue.edu<mailto:hanthrop@purdue.edu>) please do so as soon as possible. Lab Reminder Lab Users, With summer and warmer weather please remember long pants/ skirt and closed toed shoes are required in labs. This is for your safety and those around you. Just a reminder. Stephen Safety Manager Preliminary Exam Mohammad Abu Khater Thursday, May 1st at 10:30 am Birck 2001 Monitoring and Control of Evanescent-Mode Cavity Filters For more information please visit: https://engineering.purdue.edu/Intranet/Groups/Schools/ECE/Admin/Publicitem… Survey Feedback A special thank-you to all users who have provided feedback on the surveys we recently implemented. These surveys are proving to be extremely valuable to help us improve the operations and engineering here at Birck. We plan to regularly answer a subset of the inquiries and suggestions in the Friday newsletter. Nikon Microscope Calibrations: Bill Rowe and Mike Courtney checked the calibrations on the Nikon microscopes this week. In the programs they have labeled the calibrations 5x Calib 2/21/14, 10x Calib 2/21/14, etc. They have verified the calibrations for each lens on each system, and they will check calibrations each Monday and record the results. If a lens needs recalibration they will then change the calibration data in the log they're keeping. Also, the Nomarski filters are all located at the microscopes. Please be careful with the Nomarski filters and make sure you store them in the plastic box when not in use. Resist Thickness Control: Mike posted the spin speed curves for AZ 1518 and AZ 9260 in the spinner solvent hoods. Aligner Optics: We're obtaining quotes to upgrade the optics and tune-up the MJB aligners. One consideration is to eliminate the split field on the MJB3_1 . . . we would certainly like input from the user group on this idea. Thanks again for the feedback, keep the suggestions coming. Ron

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Reminder: Leica demo tomorrow TIME CORRECTION
by Anthrop, Heather L 24 Apr '14

24 Apr '14

Leica is demoing their new industrial confocal microscope DCM8 (http://www.leica-microsystems.com/products/light-microscopes/industrial-mat…) . The system boasts a low vertical resolution of 2nm and is capable of interferometer measurements. Please bring samples for measurement. For questions please contact Andrew Kovacs (andrew.s.kovacs(a)gmail.com) Venue : BRK 2233 Time : 8:30 am to 1:00 pm Date: 4/25/2014

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Reminder: Leica demo tomorrow
by Anthrop, Heather L 24 Apr '14

24 Apr '14

Leica is demoing their new industrial confocal microscope DCM8 (http://www.leica-microsystems.com/products/light-microscopes/industrial-mat…) . The system boasts a low vertical resolution of 2nm and is capable of interferometer measurements. Please bring samples for measurement. For questions please contact Andrew Kovacs. Venue : BRK 2233 Time : 10 am onwards Date: 4/25/2014

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NSAC/NCN/EDS Spring Picnic + NSAC elections --- Friday 4/25 at 5pm
by NSAC 23 Apr '14

23 Apr '14

Dear Birck Community, Join us *this Friday* for the annual Spring Picnic, co-hosted by NSAC/NCN/EDS. We'll have a lot of delicious food, fun activities, and an awards ceremony for active members and coffee hour poster presenters. When: Friday, April 25, 2014, @ 5:00PM Where: Purdue Village Community Center / Squirrel Park [map<https://goo.gl/maps/YCtlB> ] Who: All Birck and NCN/EDS students, faculty, and staff Cost: None. *NSAC will also be holding elections for officers at that time.* *Information about the officer positions and their duties *is available at the sign-up form https://docs.google.com/forms/d/1b0t5NmmzaI8xYumywIshF1b89dUAFMtGDrbtHLjjhQ…. If you would like to get more involved in the Nanotechnology community here at Purdue or have ideas about how to improve student life here at Birck, consider joining one of our committees! NSAC committees help organize events such as Game Night, Hot Cocoa Breaks, and National Lab Visits, among other activities that help enrich life at Birck. More *information about the committees* is available at the sign-up form https://docs.google.com/forms/d/1b0t5Nmmz . *About NSAC:* NSAC is an organization of graduate students at Purdue University who are interested in nanotechnology research. Our membership includes all Birck Nanotechnology Center (BNC) graduate student residents, but we encourage others to join. Our goal is to promote collaboration, enhance research awareness, and facilitate communication among faculty, staff, and students. To meet this goal, we plan regular social events, host lab open houses, and collaborate with the staff to organize the Equipment & Process Expert (Super-User) Program. We also have student volunteers that serve on the Policies and Procedures Committee for BNC. See you there! NSAC Officers

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Sexual Harassment Reporting
by Peroulis, Dimitrios 23 Apr '14

23 Apr '14

Dear all, The following email from the Associate Dean of the Graduate School has been shared with several academic units. We thought that the BNC community should also be aware of this. Best Dimitri ________________________________________________________________________________ Dimitrios Peroulis Professor, School of Electrical and Computer Engineering Deputy Director, Birck Nanotechnology Center Purdue University 1205 West State Street West Lafayette, IN 47907-2057 tel: (765) 494-3491, fax: (765) 494-4731 email: dperouli(a)purdue.edu<mailto:dperouli@purdue.edu> http://sites.google.com/site/peroulisteam/ ________________________________________________________________________________ From: Bridgham, Jeff E. Sent: Tuesday, April 22, 2014 12:08 PM To: Bridgham, Jeff E. Subject: Sexual Harassment Reporting The Graduate School wants to make sure that all graduate students are aware of ways to report concerns related to sexual harassment. Purdue's Office of Institutional Equity, located in Young Hall (10th Floor) is best positioned to receive and explore allegations regarding sexual harassment as well as other forms of harassment, discrimination, and unfair treatment. The Office of Institutional Equity suggests two electronic ways for you to share your concerns: 1. First, the Sexual Assault Report Form, which may also be used to share concerns of sexual harassment, may be accessed at https://publicdocs.maxient.com/reportingform.php?PurdueUniv&layout_id=15. Information on the form also provides contact information for the Purdue University Police Department should a student be in need of emergency assistance. When submitted, this report is received by the Office of Institutional Equity and the Office of Student Rights and Responsibilities. 2. Second, the Incident Reporting Form, a way to report a wider range of conduct concerns, may be accessed at https://publicdocs.maxient.com/incidentreport.php?PurdueUniv. When submitted, this report is received by the Office of the Dean of Students. When appropriate or needed, the report is shared with the Office of Institutional Equity. Likewise, staff in the Office of Institutional Equity are available to meet with graduate students and others in the campus community to discuss concerns connected to harassment or discrimination. You may make an appointment via email at equity(a)purdue.edu<mailto:equity@purdue.edu> or by calling 494-7253. Finally, the University's complete policies and procedures relating to harassment are available online through the Office of Institutional Equity<http://www.purdue.edu/ethics/oie/equal-access.html>. Best wishes for the remainder of the semester, Tom Atkinson Associate Dean of the Graduate School

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Buddy Policy 18Apr14.docx
by Weaver, John R 21 Apr '14

21 Apr '14

There were some questions regarding the Buddy Policy, especially regarding the use of solvent hoods after hours. Please see this new release that explains that it is recommended - but not required - that you have a buddy present when working after hours in the cleanroom or laboratories if you are not using an acid hood. If you are using an acid hood, it is required that a buddy be present. John John R. Weaver Facility Manager Birck Nanotechnology Center 1205 West State Street West Lafayette IN 47907 (765) 494-5494 jrweaver(a)purdue.edu<mailto:jrweaver@purdue.edu> nano.purdue.edu

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BNC E-news for the week of April 21st
by Anthrop, Heather L 18 Apr '14

18 Apr '14

Graduating Students Intern Position NSAC Coffee Hour Parking Purchasing Reminder Seminar Shut Down Notice Signage Graduating Students If you have had travel expenses that you have not yet been reimbursed for, please make sure you get your expenses turned in as soon as possible! Once you are no longer employed or a student here it is very difficult to get those expenses reimbursed. Please see a secretary or the business office if you have any questions. Intern Position The Birck Nanotechnology Center (BNC) would like to temporarily employ an intern student to work for up to 20h per week in a variety of exciting communications/publicity projects. The student will interact with the leadership team, faculty, staff, and students working in the center as well as other parts of the campus. Analytical skills to collect and interpret data from a variety of resources such as on-line publication records, proposal records from the Sponsored Programs Office, and others are required. The student should also be able to work and effectively/efficiently interact with the BNC leadership team, faculty, graduate students, and others to gather information, design, and create communication materials for web, print, social media, and video dissemination. Strong skills with Illustrator-Photoshop-like products, PowerPoint, Word, webpage software, and social media software. Excellent communication skills are a plus. The student will be employed on a per-hour/bi-weekly basis at a rate of $10/hour and the position is available immediately. For any questions and to apply for this position, please send your resume and a cover letter to Ms. Jaime Turner, jjturner(a)purdue.edu<mailto:jjturner@purdue.edu>, tel: 765-494-3509 NSAC Coffee Hour Urcan Guler High Temperature Plasmonics Friday, April 25th at 3:30 pm Birck Atrium Parking There will be 20 parking spaces reserved on the West lot on Monday April 21st for CTSI. There will be 20 parking spaces reserved in the West lot on Friday, April 25th from noon to 5pm. Purchasing To All Staff and Students who purchase with Ariba or a Credit Card: Please make sure that you are completing a purchasing request form (attached). This is very important for audit purposes that we have this form completed. This needs to include a brief explanation about the purpose of the purchase, and the specific project or research it benefits. If you are using a credit card for food we need to also have all attendees for the meal and business purpose. Please let the business office know if you have any questions. For the latest purchasing for please visit: https://nanohub.org/groups/bnc/File:DP_Purchase_Request.xlsx Reminder The business office is closed for lunch every day from 12:00 pm to 1:00 pm. Seminar C.K. Shih Quantum Photonics Faculty Candidate Seminar Monday, April 21st at 9:30 am in Birck 2001 For more information please visit: https://nanohub.org/groups/bnc/calendar/details/984 Christopher Woodward Wright Patterson Air Force Base Molecular-Dynamics Simulations of Molten Ni-based Superalloys Monday, April 21st at 3:45 pm ARMS 1010 David R. Gaskell Memorial Lecture Memorial Union West Faculty Lounge Friday, May 9th at 1:00 pm For more information please visit: https://engineering.purdue.edu/MSE/AboutUs/News/Events/david-r-gaskell-memo… Shut Down Notice Preventive Maintenance Shut Down Notice May 5 - May 9 The Birck Nanotechnology Center will be undergoing a semi-annual preventive maintenance and service shutdown May 5 through May 9, 2014. Air handling systems, exhaust systems, hazardous gas delivery, and monitoring systems will be down beginning at 7 a.m. Monday, May 5 through 4 p.m. Friday, May 9. The BNC staff will be performing appropriate preventive maintenance on the process equipment at this time as well. All CLEANROOM research work will be suspended until the maintenance activities are completed and all systems are returned to normal. No one will be allowed to enter the cleanroom during this time period. In addition, the laboratory areas will also be affected by this systems maintenance. As such, all LABORATORY activities that involve exhausted hoods, vacuum systems, and/or toxic gas systems will be down beginning 7 a.m. Monday, May 5 through 4 p.m. Friday, May 9. No chemical work will be allowed during this period. At the same time Physical Facilities electrical department will be completing major modification to the isolation grounding system in all general laboratories. Outlets in the laboratory with a label starting with "N" will be powered down 8 a.m. Monday, May 5 through 4 p.m. Friday, May 9. Please move any tools requiring power from the "N" outlets to the outlets starting with "S" during the previous week. It is anticipated that the building and most process tool maintenance will be completed by the end of the day on Friday, May 9. Please check Coral for equipment status and availability. For long term research planning please refer the following future dates for our future preventive maintenance shutdowns. ? Week of October 13, 2014 ? Week of May 4, 2015 ? Week of October 12, 2015 ? Week of May 2, 2016 Thank you for your cooperation and understanding during these important preventive maintenance shutdowns. BNC Management [cid:image005.png@01CF5B1D.68DD0C50][cid:image006.png@01CF5B1D.68DD0C50] Signage Dear All Birck Faculty, Staff, and Users, In an effort to provide more uniformity and to give a more professional appearance for our visitors and guests we are implementing a standard sign template to be used for all signs posted around the facility. This will include any signs used in the cleanroom, labs, galleys, subfab, restrooms, or any general gathering places around Birck. Below is the link to the template to use as well as general sign guidelines. From today forward, if you want to post a sign anywhere within Birck please use the attached template and electronically submit your sign to Ron Reger (rreger(a)purdue.edu<mailto:rreger@purdue.edu>) for approval prior to posting. Adopting this approach will give us a more coordinated and professional appearance for the many visitors who come to Birck. https://nanohub.org/groups/bnc/File:Sign_Template.pptx Thank you for your cooperation. Dimitri Peroulis Deputy Director Birck Nanotechnology Center

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Buddy Policy 18Mar14.docx
by Weaver, John R 18 Apr '14

18 Apr '14

Please read and follow the attached Buddy Policy when working in the Birck Nanotechnology Center. Since we no longer have Lab Attendants working in the facility, it is critical that you follow the attached policy to ensure your safety. John John R. Weaver Facility Manager Birck Nanotechnology Center 1205 West State Street West Lafayette IN 47907 (765) 494-5494 jrweaver(a)purdue.edu<mailto:jrweaver@purdue.edu> nano.purdue.edu

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Call for Poster Entries: 32nd International Thermal Conductivity Conference and 20th International Thermal Expansion Symposium
by Anthrop, Heather L 15 Apr '14

15 Apr '14

[Invitation Top Banner] Call For Poster Entries Attention Students: The conference registration price has been discounted by 50% for student poster presenters 32nd International Thermal Conductivity Conference and 20th International Thermal Expansion Symposium Conference Timing and Location April 27 - May 1, 2014 Purdue University West Lafayette, Indiana Poster Session Timing and Location Posters on display: April 29 - April 30 at 8:00am - 5:30pm Authors are present at their posters: April 29 at 3:30pm - 5:30pm and April 30 at 4:45pm - 5:30pm Stewart Center Room 310 Poster Submission 1. Register for the conference at the following link: Conference Website<http://www.cvent.com/events/32nd-international-thermal-conductivity-confere…> 2. Submit your poster to the following email address. **Please state the author names and poster title in the message ThermalConductivity2014(a)gmail.com<mailto:thermalconductivity2014@gmail.com> Additional Details Submit your poster by April 23 Preferred poster dimensions: 48" by 36" landscape Please hang your poster in Stewart 310 on April 29 by 8:30am Please be present at your poster during the designated times For questions regarding the poster session, contact ksaviers(a)purdue.edu<mailto:ksaviers@purdue.edu> [http://custom.cvent.com/737F604CADA14E7282FD1FA2BBCC383C/pix/2086d710ce2245…] [Invitation Bottom Banner] Having trouble with the link? Simply copy and paste the entire address listed below into your web browser: http://www.cvent.com/d/YXBarjSok0yYH5-OwBkCig/qmf1/P1/1Q? If you no longer want to receive emails from Nick Bonora please click the link below. Opt-Out<http://www.cvent.com/d/MxEuAynCEEmMeG6VR_uNPw/qmf1/E1/8D> ________________________________ [Cvent - Web-based Software Solutions]<HTTP://www.cvent.com>

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Reminder of Solar Seminar by Ana Kanevce (NREL), Tuesday, April 15th, 10:30 AM - 11:30 AM, BNC 1001
by Johnson, Vicki L. 14 Apr '14

14 Apr '14

>> I would like to cordially invite you all to the following seminar hosted by Network of Photovoltaic Technology (NPT) at Purdue. >> >> Date: Tuesday, April 15th, 2014 >> Time: 10:30 AM - 11:30 AM >> Location: Birck Nanotechnology Center (BNC) room 1001 >> >> Seminar by Dr. Ana Kanevce of the National Renewable Energy Laboratory (NREL). >> >> Title: "Insight into time-resolved photoluminescence measurements on thin-film solar cells using numerical simulations " >> >> Abstract >> Increased efficiency in thin-film solar cells requires higher degree of understanding of the recombination mechanisms, and separating the various types of recombination involved. Time resolved photoluminescence (TRPL) measurement is a contactless and quick measurement method, and therefore one of the key metrics available to determine the minority-carrier lifetime in the absorber layer of photovoltaic devices. However, when a measurement is performed on a device, in addition to carrier lifetime, the TRPL signal is affected by multiple factors including drift, diffusion and interface recombination. Deconvolution of these factors and interpretation of results is often difficult.Numerical simulations are used to analyze carrier dynamics after a sample is illuminated with a short light pulse. Simulations can determine how material parameters such as doping and defect density at the interface and bulk, as well as experimental conditions such as wavelength, illumination intensity and spatial distribution of photo-generated carriers affect the measured result.A new formalism that enables greater insight into which factors dominate the TRPL decay dynamics was developed. By breaking down the carrier dynamics into drift, diffusion, and recombination terms this formalism can point which physical factors dominate the decay dynamics under various conditions and at different times during the decay. Using this mechanism, it was found that in a typical CdTe device under typical experimental conditions used in our laboratories, the faster part of the decay is dominated by drift and diffusion of carriers, while the slower part is dominated by carrier recombination. >> >> Bio >> Dr. Ana Kanevce received a Ph.D in Physics at Colorado State University doing characterization and modeling on thin-film solar cells. Since 2007 she has been a member of the Electro-Optical Characterization Group at the National Renewable Energy Laboratory. Her research is concentrated on different PV technologies, including silicon heterojunction solar cells, multijunction solar cells based on III-V materials, and thin-film polycrystalline solar cells with Cu(In,Ga)Se2, Cu2(Zn,Sn)Se4 and CdTe absorbers. >>

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Nanodays 2014, education activities
by Shakouri, Ali 12 Apr '14

12 Apr '14

Dear All, We hosted Nanodays last Thursday and Friday, and Girl Scout Night on Wednesday evening. This was a great opportunity to showcase the impact of nanotechnology in the society and to encourage young students to pursue carriers in science and engineering. This would not have been possible without the dedicated work of our staff who have been working with Candiss Vibbert and her office for 4 months planning the nanodays events. Paul Sturm and the Discovery Park Development Intern, Jennifer Hershberger, played a key role by contacting 90 prospect companies and obtaining food and cash contributions from 14 of them. Jaime Turner did an outstanding job in coordinating and supervising the whole event. I would like to particularly thank the following main contributors: o Lisa Reece - Nano Ice Cream, coordinator, training o NSAC (Coordinators, Manny Ochoa; Misha Shalaginov) -ran the mock cleanroom o Geoff Gardner - created activities for mock cleanroom and participated in mock cleanroom the entire time o Heather Anthrop - coordinator, participant, setup and cleanup o Nancy Black - coordinator, participant, setup and cleanup o Maria Longoria Littleton (MRGN) - coordinator, participant o Cindy Ream (MRGN) - participant o Cindy Sanders - nanodays accounts, picked up donated food o Dave Sederberg - coordinator, Spring fest leader (tent 30 on the Purdue Mall near the class of 1950), training o Gale Lockwood -nano treasure hunt Tanya Faltens (NCN) lead the preparation of volunteers and training, and prepared teacher info before the event. We also had quite a few staff who helped to set up the activities and clean up: o Ron Reger - gave tour for school, helped with set up and clean up o Steve Jurss - gave tour for school, helped with cleanup o Guy Telesnicki - supervised an activity o Donna Brown - supervised an activity and picked up donated food o Gilly Anderson - picked up donated food o Christy Daugherty - picked up donated food o Tracy Hudson - supervised an activity both on Girl Scout evening and during Nanodays o Bambrah Miller (MRGN) - participant o Joanna Allen - picked up donated food o Natosha Whisler - helped move tables for clean up o Mary Jo Totten - reserved bus lot and walkie talkies o Lorraine Fox - helped move tables for clean up I was glad to see quite a few graduate students and several faculty who supervised the activities and interacted with our young visitors. This is a great way to fulfill outreach activities for NSF or similar grants. Together with Peter Bermel and Lisa Reece, we are working to prepare material for Research Goes to School. This is an NSF program lead by Gabriela Weaver and Discovery Learning Research Center. During the next two summers, we will have a two-week training for a group of pre-service and in-service high school teachers from rural Indiana to introduce nanotechnology concepts in their classes. We hope this can be the basis of future nanotechnology K-12 and UG education grants. It will be great if other faculty could also take the lead and include nanodays in their upcoming proposals. Thanks to Gabriele Appenzeller and Phillip Fiorini, Journal and Courier was invited and they wrote a nice article about nanodays: http://www.jconline.com/article/20140411/NEWS0501/304110030/At-NanoDays-kid… Thanks again for everybody's outstanding work. Please let me or Jaime know if you have suggestions and comments on how we can improve Nanodays or similar events in the future. Best regards, Ali

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BNC E-news for the week of April 14th
by Anthrop, Heather L 11 Apr '14

11 Apr '14

Intern Position NSAC Coffee Hour Parking Seminar Intern Position The Birck Nanotechnology Center (BNC) would like to temporarily employ an intern student to work for up to 20h per week in a variety of exciting communications/publicity projects. The student will interact with the leadership team, faculty, staff, and students working in the center as well as other parts of the campus. Analytical skills to collect and interpret data from a variety of resources such as on-line publication records, proposal records from the Sponsored Programs Office, and others are required. The student should also be able to work and effectively/efficiently interact with the BNC leadership team, faculty, graduate students, and others to gather information, design, and create communication materials for web, print, social media, and video dissemination. Strong skills with Illustrator-Photoshop-like products, PowerPoint, Word, webpage software, and social media software. Excellent communication skills are a plus. The student will be employed on a per-hour/bi-weekly basis at a rate of $10/hour and the position is available immediately. For any questions and to apply for this position, please send your resume and a cover letter to Ms. Jaime Turner, jjturner(a)purdue.edu<mailto:jjturner@purdue.edu>, tel: 765-494-3509 NSAC Coffee Hour Mikhail Shalaginov Towards Single-Photon Source based on Nitrogen-Vacancy center in Nanodnamic and Hyperbolic Metamaterial Birck Atrium Friday, April 18th at 3:30 pm Parking On April 16th there will be 20 parking places reserved. Seminar Chadler Becker Material Measurement Laboratory National Institute of Standards and Technology Monday, April 14th at Noon in Birck 1001 The NIST Interatomic Potentials Repository - a resource for reproducibility in atomistic simulations For more information please visit: http://www.purdue.edu/discoverypark/prism/events/view.php?id=1584 Ana Kanevce National Renewable Energy Laboratory Insight into time-resolved photoluminescence measurements on thin-film solar cells using numerical simulations Tuesday, April 15th at 10:30 am in Birck 1001 For more information please visit: https://nanohub.org/groups/bnc/calendar/details/979

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Prof. Anton Malko Condensed Matter Seminar - April 11th at 3:30pm in PHYS 203
by Turner, Jaime J 10 Apr '14

10 Apr '14

Professor Anton V. Malko The University of Texas at Dallas, Department of Physics "Efficient Unidirectional Energy Transfer Through Graded Nanocrystal Assemblies Into Silicon Substrates" Friday April 11, 2014 3:30pm PHYS 203 Refreshments are served at 3:00 p.m. in Physics room 242. http://www.utdallas.edu/~avm074000<http://www.utdallas.edu/%7Eavm074000> Hybrid nanostructures attract considerable attention as candidates for practical photovoltaic (PV) devices. A promising approach is offered by non-contact energy transfer-based hybrid nanostructures combining strongly absorbing components, such as inorganic nanocrystal quantum dots (NQDs), with high-mobility semiconductor (SC) layers. In such hybrid systems, the excitonic energy is transferred via non-radiative (NRET) and radiative (RET) energy transfers across the interface with the subsequent separation and transport of charge carriers entirely within the SC-based component. We have prepared hybrid structures consisting of several monolayers (ML) of the colloidal CdSe/ZnS NQDs attached to oxide-free Si surfaces. The bottom NQD ML is directly attached to the Si surface via self-assembled layer of amine-modified carboxy-alkyl chain linkers. Using hydrosilylation, H-terminated Si surfaces are fully functionalized through Si-C bonding (no interface oxide), providing functional headgroups for NQD's attachment. The consequent, size-gradient NQD MLs are grafted via covalent linking by ethylene-diamine molecules. This approach results in the creation of tightly controlled, multilayer NQD structures with well determined distances to the Si surface, ideally suited for energy transfer studies. We have demonstrated that efficient NRET and RET take place from NQD layers into Si substrates of various geometries. NRET, which is characterized by donor/acceptor dipole-dipole interaction, is shown to be an efficient mechanism for energy coupling for proximal NQDs (ENRET~65%) in the visible portion1, while radiative coupling into waveguiding modes of Si substrates2 plays the major role in the near-infrared.3 Overall transfer efficiency of Etotal~90% for a single NQD ML on Si has been obtained. However, to harvest the majority of sunlight, multilayer NQD films of several hundred nm thickness need to be created. We further utilize ET concepts to create graded multilayer NQD films with directed energy flow towards Si substrate via the cascaded interlayer NRET. We demonstrated that for bi-layer and tri-layer NQD structures, more than 80% of excitons originating in the outermost NQD ML are eventually transferred into Si substrate.4 These results are confirmed by theoretical calculations taking into account various rates of NRET between NQD MLs and direct RET into Si substrate and are consistent with the expectation of the defect-free layer grafting. Our spectroscopy studies are further confirmed by the measurements of ET-induced photocurrents in Si substrates. Such data further support the development of the efficient, thin film, ET-based hybrid structures for photovoltaic applications. [1] H. M. Nguyen, et al., Appl. Phys. Lett. 98, 161904 (2011) [2] H. M. Nguyen, et al., ACS Nano 6, 5574 (2012) [3] M. Nimmo, et al., ACS Nano 7, 3236-3245 (2013) [4] W. de Benedetti, et al., submitted. Jaime Turner Birck Nanotechnology Center 1205 West State Street West Lafayette, IN 47907-2057 Email: jjturner(a)purdue.edu<mailto:jjturner@purdue.edu> Phone: 765-494-3509

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Solar Seminar by Ana Kanevce (NREL), Tuesday, April 15th, 10:30 AM - 11:30 AM, BNC 1001
by Xufeng Wang 10 Apr '14

10 Apr '14

Dear all, I would like to cordially invite you all to the following seminar hosted by Network of Photovoltaic Technology (NPT) at Purdue. Date: Tuesday, April 15th, 2014 Time: 10:30 AM - 11:30 AM Location: Birck Nanotechnology Center (BNC) room 1001 Seminar by Dr. Ana Kanevce of the National Renewable Energy Laboratory (NREL). Title: "Insight into time-resolved photoluminescence measurements on thin-film solar cells using numerical simulations " Abstract Increased efficiency in thin-film solar cells requires higher degree of understanding of the recombination mechanisms, and separating the various types of recombination involved. Time resolved photoluminescence (TRPL) measurement is a contactless and quick measurement method, and therefore one of the key metrics available to determine the minority-carrier lifetime in the absorber layer of photovoltaic devices. However, when a measurement is performed on a device, in addition to carrier lifetime, the TRPL signal is affected by multiple factors including drift, diffusion and interface recombination. Deconvolution of these factors and interpretation of results is often difficult.Numerical simulations are used to analyze carrier dynamics after a sample is illuminated with a short light pulse. Simulations can determine how material parameters such as doping and defect density at the interface and bulk, as well as experimental conditions such as wavelength, illumination intensity and spatial distribution of photo-generated carriers affect the measured result.A new formalism that enables greater insight into which factors dominate the TRPL decay dynamics was developed. By breaking down the carrier dynamics into drift, diffusion, and recombination terms this formalism can point which physical factors dominate the decay dynamics under various conditions and at different times during the decay. Using this mechanism, it was found that in a typical CdTe device under typical experimental conditions used in our laboratories, the faster part of the decay is dominated by drift and diffusion of carriers, while the slower part is dominated by carrier recombination. Bio Dr. Ana Kanevce received a Ph.D in Physics at Colorado State University doing characterization and modeling on thin-film solar cells. Since 2007 she has been a member of the Electro-Optical Characterization Group at the National Renewable Energy Laboratory. Her research is concentrated on different PV technologies, including silicon heterojunction solar cells, multijunction solar cells based on III-V materials, and thin-film polycrystalline solar cells with Cu(In,Ga)Se2, Cu2(Zn,Sn)Se4 and CdTe absorbers. Regards, Xufeng

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REMINDER: Mikael Rechtsman Seminar today at 9:30am in BRK 1001
by Turner, Jaime J 07 Apr '14

07 Apr '14

[cid:image001.png@01CF5240.610955A0] Jaime Turner Birck Nanotechnology Center 1205 West State Street West Lafayette, IN 47907-2057 Email: jjturner(a)purdue.edu<mailto:jjturner@purdue.edu> Phone: 765-494-3509

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BNC Distinguished Seminar 4/7, 11am-12noon , MRGN 121
by Shakouri, Ali 06 Apr '14

06 Apr '14

Dear All, We have a special seminar on Monday April 7th 11am-12noon in Burton Morgan 121. Dr. Jo DoBoeck, CTO and Senior Vice President of IMEC (Microelectronic research center in Belgium) will talk about "Ultimate devices for a sustainable society" (see below the abstract). IMEC is one of the most successful research centers/ industry consortia focusing on advancing nanoelectronics and flexible electronics (through Holst Center) enabling new applications in healthcare, energy and wireless sensors/networks. I encourage you to attend this seminar. Best regards, Ali "BNC Distinguished Seminar Series" April 7, 2014 @ 11:00am MRGN, ROOM 121 Jo De Boeck CTO and Senior Vice President, IMEC Corporate Title: Ultimate devices for a sustainable society. Abstract: The global industry is striving to make solutions that will make the world a better, more sustainable place. In life sciences, innovative tools are needed which will transform the way we conduct life science research, diagnose illnesses and treat patients. Tools that will lead to a sustainable healthcare system for everyone, everywhere. In communication, we need solutions that will allow us to cope with the exponential growth in data and required computation. Solutions that will lead to a whole new range of unthinkable applications that increase our well-being and welfare. In every aspect of our life, innovative solutions can lead to a more comfortable, safer and sustainable live. All these solutions have one thing in common: enormous complexity. Complexity that cannot be solved when we stick to our own expertise. Nanoelectronics will be the core of all these future innovations. But it's clear that we need to venture beyond our borders to make true innovation happen. We need to converge disciplines and technologies, a sum of minds. Bio: Jo De Boeck received his engineering degree in 1986 and his PhD degree in 1991 from the University of Leuven. Since 1991 he is a staff member of imec (Leuven). He has been a NATO Science Fellow at Bellcore (USA, 1991-92) and AST-fellow in the Joint Research Center for Atom Technology (Japan, 1998). In his research career, he has been leading activities on integration of novel materials at device level and new functionalities at systems level. In 2003 he became Associate Vice President at IMEC for the Microsystems division and in 2005 started Holst Centre (Eindhoven) and became CEO of IMEC-Netherlands. From 2009 to 2011 he headed imec's unit Smart Systems and Energy Technology as Senior Vice President in the imec group. In 2011 he was appointed CTO of imec corporate. He is part-time professor at the KU Leuven and visiting professor at the TU Delft.

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BNC E-news for the week of April 7th
by Anthrop, Heather L 04 Apr '14

04 Apr '14

Seminar Shut Down Notice Seminar Mikael Rechtsman Quantum Photonics Faculty Candidate Seminar Photonic Topological Insulators and Pseudomagnetism Monday, April 7th at 9:30 am in BRK 1001 For more information, please visit: http://www.purdue.edu/discoverypark/events/view.php?id=1587 Jo De Boeck CTO and Senior Vice President, IMEC Corporate Ultimate devices for a sustainable society Monday, April 7th at 11:00 am in MRGN 121 For more information, please visit: http://www.purdue.edu/discoverypark/nanotechnology/events/view.php?id=1539 Shut Down Notice Preventive Maintenance Shut Down Notice May 5 - May 9 The Birck Nanotechnology Center will be undergoing a semi-annual preventive maintenance and service shutdown May 5 through May 9, 2014. Air handling systems, exhaust systems, hazardous gas delivery, and monitoring systems will be down beginning at 7 a.m. Monday, May 5 through 4 p.m. Friday, May 9. The BNC staff will be performing appropriate preventive maintenance on the process equipment at this time as well. All CLEANROOM research work will be suspended until the maintenance activities are completed and all systems are returned to normal. No one will be allowed to enter the cleanroom during this time period. In addition, the laboratory areas will also be affected by this systems maintenance. As such, all LABORATORY activities that involve exhausted hoods, vacuum systems, and/or toxic gas systems will be down beginning 7 a.m. Monday, May 5 through 4 p.m. Friday, May 9. No chemical work will be allowed during this period. At the same time Physical Facilities electrical department will be completing major modification to the isolation grounding system in all general laboratories. Outlets in the laboratory with a label starting with "N" will be powered down 8 a.m. Monday, May 5 through 4 p.m. Friday, May 9. Please move any tools requiring power from the "N" outlets to the outlets starting with "S" during the previous week. It is anticipated that the building and most process tool maintenance will be completed by the end of the day on Friday, May 9. Please check Coral for equipment status and availability. For long term research planning please refer the following future dates for our future preventive maintenance shutdowns. ? Week of October 13, 2014 ? Week of May 4, 2015 ? Week of October 12, 2015 ? Week of May 2, 2016 Thank you for your cooperation and understanding during these important preventive maintenance shutdowns. BNC Management [cid:image002.png@01CF5013.FB2EE930][cid:image004.png@01CF5013.FB2EE930]

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Physics Colloquia - Prof. Bennett Goldberg - April 3rd at 4pm in PHYS 203
by Turner, Jaime J 02 Apr '14

02 Apr '14

Professor Bennett Goldberg Boston University "Strain Engineering of 2D Crystals" Thursday April 03, 2014 4:00pm PHYS 203 Refreshments are served at 3:30 p.m. in Physics room 242 Two-dimensional materials are flexible, transparent, compatible with living systems, and can enable new devices and physics based on their unique properties. One unique property is the ability of 2D crystals a single atom thick to undergo massive amounts of strain without failure. Since strain also drastically modifies the band structure leading to large changes in transport and optical properties, strain engineering of 2D crystals has the potential to create new devices, explore transport in pseudo-magnetic fields, and tune tunneling or excitonic effects. Graphene is the most well-studied of 2D crystals, and shows a strain-induced pseudo vector potential that can lead, in certain circumstances, to pseudo-magnetic fields. Recent work shows strain allows one to tune the band gap in transition metal dicalchognides, another class of 2D crystals. In this colloquium, we will explore strain by suspending 2D crystal membranes of graphene and hexagonal boron nitride over microchambers, creating a sealed drum. Tuning the strain through pressure deflects the membrane, changing its properties. Remarkably, the assumption of a fixed circumference is wrong, because we observe the 2D crystal sliding across the supported part of the microchamber. We will discuss friction, strain engineering, and future prospects for 2D crystals. Jaime Turner Birck Nanotechnology Center 1205 West State Street West Lafayette, IN 47907-2057 Email: jjturner(a)purdue.edu<mailto:jjturner@purdue.edu> Phone: 765-494-3509

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Dr. Steven Cundiff Seminar - April 4th at 10am in BRK 1001
by Turner, Jaime J 01 Apr '14

01 Apr '14

[cid:image001.png@01CF4DCB.C8EFC3D0] Jaime Turner Birck Nanotechnology Center 1205 West State Street West Lafayette, IN 47907-2057 Email: jjturner(a)purdue.edu<mailto:jjturner@purdue.edu> Phone: 765-494-3509

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HD TV Monitor Found!
by Reger, Ronald K 01 Apr '14

01 Apr '14

Dear Birck Residents and Users, We have located the missing 60" monitor thanks to the efforts of Terry LaOrange. It turns out that the monitor was stored at another location outside of the BNC, and now that it has been located we will proceed with the installation of all three monitors in the near future. Thanks to everyone who helped us search for this. Best regards, Ron

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