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

Professor Warren Chan Seminar - Feb. 13th at 10am in MRGN 121
by Turner, Jaime J 12 Feb '14

12 Feb '14

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Hot Chocolate - today at 2p in BRK kitchen
by NSAC 12 Feb '14

12 Feb '14

Dear Birck grad students, staff, and faculty, The Nanotechnology Student Advisory Council (NSAC) invites you to stop by the BRK kitchen for Hot Chocolate today (and every Wednesday from now until the end of March) at 2PM. Come relax and chat for a few minutes while drinking some delicious hot chocolate. We hope to see you there! NSAC Officers

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Dr. Yunusov and Dr. Akimov Seminars TODAY at 12:00pm in BRK 2001
by Turner, Jaime J 10 Feb '14

10 Feb '14

Seminars - Please find abstracts attached. Dr. Ruslan Yunsov Russian Quantum Center CEO Birck 2001 at 12:00 pm Hosted by Vlad Shalaev Alexey Akimov Russian Quantum Center Senior Scientific Researcher Birck 2001 at 1:00 pm Hosted by Vlad Shalaev Link to the Russian Quantum Center http://www.rqc.ru/

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(Updated) BNC e-news for the week of Feb. 10th
by Anthrop, Heather L 07 Feb '14

07 Feb '14

All User Make-up Session New Equipment NSAC Coffee Presentation Seminars All User Make-up Session Thursday, February, 13th 3 to 4pm Birck 1001 If you cannot attend this session please see Mary Jo Totten in Birck 1220. New Equipment Today we are excited to announce the completion of the installation and acceptance of the Heidelberg DWL66FS laser writer. It is located in the M bay of the cleanroom. The DWL 66FS is a maskless pattern generator made for direct laser writing of structures on any flat material or curved surface that is coated with photoresist. It has an address grid of 100nm, a minimum feature size of 1um and a write speed of 10 mm²/minute. Other features include- · Substrates up to 9 x 9 inches · 8 x 8 inch write area · Backside alignment with an overlay accuracy of 6um · 375nm UV Diode Laser · Accepts the following data formats- o DXF, CIF, GDSII, Gerber Jobs can be submitted through the mask queue just like a normal optically generated mask. Please see Mike Courtney 494-6522 mcourtne(a)purdue.edu<mailto:mcourtne@purdue.edu> or Bill Rowe 496-8389 wrowe(a)purdue.edu<mailto:wrowe@purdue.edu> for more information or a demonstration. [DSCN4845] NSAC Coffee Presentation Andrew Kovacs and Wesley present "Cellular Phones and You" Friday, February 14th at 3:30 pm Atrium Seminar Dr. Ruslan Yunsov Russian Quantum Center CEO Birck 2001 at 12:00 pm Hosted by Vlad Shalaev Alexey Akimov Russian Quantum Center Senior Scientific Researcher Birck 2001 at 1:00 pm Hosted by Vlad Shalaev Dr. Elena Aksel Tokyo Institute of Technology Developing Structure-Property Relationships in Functional Materials Tuesday, Feb. 11th at 9:30 am ARMS 3115 Warren C.W. Chan University of Toronto, Institute of Biomaterials & Biomolecular Research, Donnelly Centre for Cellular and Biomolecular Research The Complexities of Targeting Nanoparticles into Solid Tumors Thursday, February 13th at 10:00 am MRGN 121 For more information: http://www.purdue.edu/discoverypark/nanotechnology/events/view.php?id=1519 Thank you, Heather L Anthrop Purdue University Birck Nanotechnology Center 1205 West State Street West Lafayette, IN 47907 (765) 494-7053

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BNC e-news for the week of Feb. 10th
by Anthrop, Heather L 07 Feb '14

07 Feb '14

All User Make-up Session New Equipment Seminars All User Make-up Session Thursday, February, 13th 3 to 4pm Birck 1001 If you cannot attend this session please see Mary Jo Totten in Birck 1220. New Equipment Today we are excited to announce the completion of the installation and acceptance of the Heidelberg DWL66FS laser writer. It is located in the M bay of the cleanroom. The DWL 66FS is a maskless pattern generator made for direct laser writing of structures on any flat material or curved surface that is coated with photoresist. It has an address grid of 100nm, a minimum feature size of 1um and a write speed of 10 mm²/minute. Other features include- · Substrates up to 9 x 9 inches · 8 x 8 inch write area · Backside alignment with an overlay accuracy of 6um · 375nm UV Diode Laser · Accepts the following data formats- o DXF, CIF, GDSII, Gerber Jobs can be submitted through the mask queue just like a normal optically generated mask. Please see Mike Courtney 494-6522 mcourtne(a)purdue.edu<mailto:mcourtne@purdue.edu> or Bill Rowe 496-8389 wrowe(a)purdue.edu<mailto:wrowe@purdue.edu> for more information or a demonstration. [DSCN4845] Seminar Dr. Ruslan Yunsov Russian Quantum Center CEO Birck 2001 at 12:00 pm Hosted by Vlad Shalaev Alexey Akimov Russian Quantum Center Senior Scientific Researcher Birck 2001 at 1:00 pm Hosted by Vlad Shalaev Dr. Elena Aksel Tokyo Institute of Technology Developing Structure-Property Relationships in Functional Materials Tuesday, Feb. 11th at 9:30 am ARMS 3115 Warren C.W. Chan University of Toronto, Institute of Biomaterials & Biomolecular Research, Donnelly Centre for Cellular and Biomolecular Research The Complexities of Targeting Nanoparticles into Solid Tumors Thursday, February 13th at 10:00 am MRGN 121 For more information: http://www.purdue.edu/discoverypark/nanotechnology/events/view.php?id=1519 Thank you, Heather L Anthrop Purdue University Birck Nanotechnology Center 1205 West State Street West Lafayette, IN 47907 (765) 494-7053

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Re: [BNC-all] Prelim exam (Feb-7): Performance limits of solar cells
by Mohammad Ryyan Khan 07 Feb '14

07 Feb '14

Hello, Just a reminder about my prelim talk today (please see details below). Regards, M. Ryyan Khan On 2/3/2014 11:21 AM, Mohammad Ryyan Khan wrote: > Hello, > > I would like to invite you all to my prelim talk. > > Date: Feb.7.2014 > Time: 3:30pm > Location: BRK 1001 > > > Title: *Performance limits of solar cells* > > /Abstract:/ > > The solar cell device concepts can be broadly classified into two > groups: (i) high efficiency crystalline cells with efficiencies > approaching the thermodynamic limit, and (ii) lower cost thin film > alternatives that offer improved cost-efficiency tradeoffs. For the > first group, the challenge is to develop a meticulous understanding of > cell operation so that the remaining efficiency gap can be closed. For > the second group, the challenge is to develop a material-specific > understanding of cell operation to improve the efficiency and > reliability of the cell. > > /_First_/, in an effort to explore the limits of cell operation for > both types of technologies, we have studied the thermodynamics limit > of PV operation from a new perspective of a 2-level solar cell. Our > approach provides qualitative and intuitive understanding of the loss > components in an ideal PV device. The analysis framework also shows > how the existence of heterojunction (HJ) in organic photovoltaics > (OPVs) limits the upper bound of performance even for perfect > absorption and 100% carrier extraction. /_Second_/, we considered the > detailed balance limit in presence of non-ideal optical response > (incomplete absorption and existence of non-radiative recombination) > for a given PV material. This study demonstrates that the > thermodynamic efficiency limit can be asymptotically reached with > imperfect absorption---however, designs towards ultra-high efficiency > systems need to consider non-radiative recombination effect. /_Third > and finally_/, we considered two major topics of practical systems: > (i) addressing poor carrier collection (for OPVs), and (ii) general > light absorption schemes. We have proposed design perspectives and new > structures to address poor carrier transport in OPVs. These ideas > involve providing shorter route for carrier to contact paths. Our > nanowire (NW) based photon absorption scheme has separate tuning > handles for reflection and absorption---unlike previous NW schemes > where there was a trade-off between reflection and absorption. In our > latest work, we have proposed a light management scheme that can > perfectly trap the photons that are coupled into the structure. This > approach has the potential to break the geometric light trapping > limit, and also can be easily integrated into a planar thin film PV > device. > > > > Regards, > M. Ryyan Khan, > PhD RA, Prof M. A. Alam, > ECE, Purdue University > http://web.ics.purdue.edu/~khan23/ >

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All User MAke-up session
by Jurss, Stephen E 06 Feb '14

06 Feb '14

Users, Make up session will be Feb 13, 2014 in BNC 1001 from 3:00pm-4:00pm. If you are unable to attend please see Mary Jo. Stephen Stephen E. Jurss CIH, CSP Safety Manager Birck Nanotechnology Center 1205 W. State Street West Lafayette, IN 47907 Tx: 765-496-8337 E-mail: sejurss(a)purdue.edu<mailto:sejurss@purdue.edu>

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NSAC: Robert Sayer Presentation CANCELLED
by Alfredo Tuesta 05 Feb '14

05 Feb '14

Due to the snow emergency the presentation for today at 4:30PM in MRGN 121 has been cancelled. Alfredo NSAC Social Chair -- PhD Candidate Purdue University School of Mechanical Engineering Birck Nanotechnology Center 1205 West State Street (Office 2234) West Lafayette, IN 47907-2057

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FW: Prelim exam (Feb-7): Performance limits of solar cells
by Turner, Jaime J 03 Feb '14

03 Feb '14

Hello, I would like to invite you all to my prelim talk. Date: Feb.7.2014 Time: 3:30pm Location: BRK 1001 Title: Performance limits of solar cells Abstract: The solar cell device concepts can be broadly classified into two groups: (i) high efficiency crystalline cells with efficiencies approaching the thermodynamic limit, and (ii) lower cost thin film alternatives that offer improved cost-efficiency tradeoffs. For the first group, the challenge is to develop a meticulous understanding of cell operation so that the remaining efficiency gap can be closed. For the second group, the challenge is to develop a material-specific understanding of cell operation to improve the efficiency and reliability of the cell. First, in an effort to explore the limits of cell operation for both types of technologies, we have studied the thermodynamics limit of PV operation from a new perspective of a 2-level solar cell. Our approach provides qualitative and intuitive understanding of the loss components in an ideal PV device. The analysis framework also shows how the existence of heterojunction (HJ) in organic photovoltaics (OPVs) limits the upper bound of performance even for perfect absorption and 100% carrier extraction. Second, we considered the detailed balance limit in presence of non-ideal optical response (incomplete absorption and existence of non-radiative recombination) for a given PV material. This study demonstrates that the thermodynamic efficiency limit can be asymptotically reached with imperfect absorption-however, designs towards ultra-high efficiency systems need to consider non-radiative recombination effect. Third and finally, we considered two major topics of practical systems: (i) addressing poor carrier collection (for OPVs), and (ii) general light absorption schemes. We have proposed design perspectives and new structures to address poor carrier transport in OPVs. These ideas involve providing shorter route for carrier to contact paths. Our nanowire (NW) based photon absorption scheme has separate tuning handles for reflection and absorption-unlike previous NW schemes where there was a trade-off between reflection and absorption. In our latest work, we have proposed a light management scheme that can perfectly trap the photons that are coupled into the structure. This approach has the potential to break the geometric light trapping limit, and also can be easily integrated into a planar thin film PV device. Regards, M. Ryyan Khan, PhD RA, Prof M. A. Alam, ECE, Purdue University http://web.ics.purdue.edu/~khan23/<http://web.ics.purdue.edu/%7Ekhan23/>

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