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Prelim exam tomorrow
by MD Abdul Wahab 30 Jan '14

30 Jan '14

Hello All, I would like to invite you for my prelim talk tomorrow. Here are the details. Thesis title: Computational modeling and design of aligned-array nanotube/nanowire transistors for high speed nanoelectronic applications Examination Date: Friday, January 31, 2014 Examination Time: 9:30 AM Examination Location: Birck Nanotechnology Center (BNC) Room 1001 Abstract: As the era of classical planar metal-oxide-semiconductor field-effect transistors (MOSFETs) comes to an end, the semiconductor industry is moving toward the 3D device architectures, such as FinFETs, starting at the 22 nm technology node. The FinFET will likely scale down to 10 nm, but since physical limits such as the short channel effect (SCE) and/or surface roughness scattering may dominate; it may be difficult to scale Si FinFET below 10 nm. Other 3D FET structures, based on an array of single-wall carbon nanotube (SWNT) or gate-all-around (GAA) InGaAs nanowire (NW), have higher drive current and could be a viable technology option below 10 nm. The goal of this thesis is two-fold: first, to help design SWNT devices by considering theoretical merits of new strategies of removing metallic (m-) SWNTs, while retaining semiconducting (s-) SWNTs in chemically pristine form, and then achieving high density (>150 /µm) by multiple transfer printing. The second goal is to analyze the reliability of these array transistors (for SWNT: random and correlated breakdown (CBD) due to the electrostatic cross-talk; for InGaAs: degradation due to the negative bias temperature instability (NBTI), positive bias temperature instability (PBTI), and hot carrier injection (HCI)). We have developed a phenomenological 3D self-consistent computation model which deals with electrostatics (drift-diffusion with Poisson) and heat transport to analyze process-performance-reliability of nanotube and nanowire transistors. Through this model, we have made the following contributions. (i) Characterization of the s-SWNTs diameter distribution through electroluminescence. (ii) Modeling strategies of soft-burning toward filtering m-SWNTs using thermocapillary flow mechanism with two independent heat sources: DC and microwave. (iii) Modeling electrostatic control of gate over SWNT density. (iv) Modeling electrostatic cross-talk in high-density carbon nanotubes to explore the density limit to avoid correlated breakdown in channel and false programming in phase-change-memory. I work closely with my colleagues from UIUC to systematically validate the results with experiments. In future work, I will have two major themes: First, I will generalize 3D partial-gate-FET with aligned-array carbon nanotube as channel for bio-sensing application. Second, I will analyze variability and reliability of multiple nanowires GAA-InGaAs 3D and 4D transistors. For multiple nanowires, nanowire to nanowire variability may change the performance of the device. This variability may enhance because of the self-heating. Important reliability concerns (e.g., PBTI, HCI, and NBTI) will be analyzed. Our studies establish a method by which high density aligned-array of s-SWNTs (in chemically pristine form) are available as channel materials for logic applications at sub 10 nm technology node. The analysis of variability and reliability of the multiple nanowires GAA-InGaAs transistors will help to improve the performance and lifetime of the integrated circuits based on the technology. Regards, Abdul Wahab -- Muhammad A. Wahab Graduate Research Assistant Prof. Muhammad Ashraful Alam's CEED Group School of Electrical and Computer Engineering Purdue University, West Lafayette, IN Website: http://web.ics.purdue.edu/~mwahab/

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free cookies in the kitchen
by Turner, Jaime J 19 Dec '13

19 Dec '13

Hey all, There is a lot of leftover cookies, cupcakes and other sweets in the kitchen, please feel free to take what you want!! Thanks! Jaime Turner Birck Nanotechnology Center Purdue University 1205 West State STreet West Lafayette, IN 47907-2057 (765) 494-3509 jjturner(a)purdue.edu

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NSAC trip: Visit to Fermilab - Saturday, December 7th (RSVP required)
by NSAC 26 Nov '13

26 Nov '13

Dear BRK grad students, NSAC would like to invite you to a tour of Fermilab (Fermi National Accelerator Laboratory, near Chicago, IL) on* Saturday December 7th, 2013*. Fermilab (http://www.fnal.gov/) is a US Department of Energy national laboratory specializing in high-energy particle physics with a mission to inspire the world and enable its scientists to solve the mysteries of matter, energy, space and time for the benefit of all. We are registered as a group and* limited to 20 people*. We will be leaving at 8 a.m.and expect to return to Purdue that evening (exact time depends on individual drivers). The tour lasts about two hours. We will view the Laboratory from the 15th floor windows and visit various displays located there. The tour moves to the Linear Accelerator building where we will see the Cockcroft-Walton, the components in the linear accelerator gallery and the Main Control Room. A detailed agenda for the day will be emailed later to all attendees. If you are interested in going, please *RSVP at the following link by November 25th*; availability is on a first-come, first-served basis (limit 20 people). https://docs.google.com/forms/d/1lF4pj86-atijpHLqXo5-_GlFt7ipxXoWDkH53ApO3k… Further information regarding transportation will be sent later. Email nsac(a)purdue.eduif you have any questions/comments.

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Fwd: [Reminder] Final Exam Announcement - Nov. 21, 3 PM, BRK 1001
by John Wilcox 21 Nov '13

21 Nov '13

Scheduling of Examinations: Student’s Name: John Wilcox Examination Date: 11-21-2013 Examination Time: 3:00 PM Building & Room: BRK 1001 Thesis Title: Solar Cell Temperature Dependent Efficiency and Very High Temperature Efficiency Limits Abstract: Clean renewable solar energy is and will continue to be an important source of electrical energy. Solar energy has the potential of meeting all of the world’s energy needs, and has seen substantial growth in recent years. Solar cells can convert sun light directly into electrical energy, and much progress has been made in making them less expensive and more efficient. Solar cells are often characterized and modeled at 25 °C, which is significantly lower than their peak operating temperature. In some thermal concentrating systems, solar cells operate above 300 °C. Since increasing the temperature drastically affects the terminal characteristics, it is important to quantify the losses caused by raising the temperature. Methodologies for including the temperature dependent material parameters in analytical and detailed numerical models have be examined. The analytical model has been developed to analyze Shockley-Queisser detailed balance limit, as well as the Auger, Radiative and SHR recombination limiting cases from 25 °C to 800 °C, at 1x, 500x and 2000x suns concentrations. The results of this analysis show that the efficiency of a direct bandgap material with an optimal bandgap could reach 19 % at 400 °C and 2000x suns, if the SHR recombination is reduced to an acceptable level. An analytical solar cell model was also used in a quasi-3D numerical model to simulate the temperature dependent resistivity losses. It was found that the resistive losses can double when the temperature of a solar cell increases from 25 °C to 100 °C. This will cause the conversion efficiency temperature coefficient to deteriorate by 10%. By using the temperature dependent material parameters for Si in a detailed numerical model, it was found that some of the adjustable parameters, increase the conversion efficiency temperature coefficient and the Voc, while other parameters would only increase the Voc. This conclusion can be used by solar cell manufactures to improve the solar cell parameters with the biggest possible gain. -- John Wilcox jrwilcox(a)purdue.edu Purdue University School of Electrical and Computer Engineering

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[Reminder] Prof. Andy Weiner Lecture on Ultrafast & Broadband Photonic Signal Processing
by Zun(Andy) Huang 21 Nov '13

21 Nov '13

Dear students, Just a quick reminder about the lecture by Prof. Andy Weiner today in MSEE B012 at 4:30pm. Food and beverage will be provided. See you there ! Best, Zun Huang OPSC On Fri, Nov 15, 2013 at 3:15 PM, Zun(Andy) Huang <huang105(a)purdue.edu>wrote: > *Andy M. Weiner, * > > > *Scifres Family Distinguished Professor of Electrical and Computer > Engineering * > > *Purdue University* > > > *LECTURE TITLE:* > > *" SELECTED TOPICS IN ULTRAFAST & BROADBAND PHOTONIC SIGNAL PROCESSING "* > > > > *Thursday, November 21, 2013 4:30 – 5:30 p.m. @ MSEE B012* > > > Please find more details about the lecture and the speaker in the attached > flyer. > > > This lecture is part of Invited Technical Seminar program organised by OSA > (Optical Society of America) Purdue Student Chapter and sponsored by OSA. > > > Best regards, > Zun Huang > OSA Purdue Student Chapter > > > -- > Zun(Andy) Huang > Research Assistant, PhD student > President,Optical Society of America Purdue Student Chapter > President, ECE Graduate Student Association > Birck Nanotechnology Center, > 1205 West State Street, W. Lafayette, IN 47907 > (765)494-0215 > zun(a)purdue.edu > > -- Zun(Andy) Huang Research Assistant, PhD student President,Optical Society of America Purdue Student Chapter President, ECE Graduate Student Association Birck Nanotechnology Center, 1205 West State Street, W. Lafayette, IN 47907 (765)494-0215 zun(a)purdue.edu

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Prof. Andy Weiner Lecture on Ultrafast & Broadband Photonic Signal Processing Nov. 21st, 430PM
by Zun(Andy) Huang 15 Nov '13

15 Nov '13

*Andy M. Weiner, * *Scifres Family Distinguished Professor of Electrical and Computer Engineering * *Purdue University* *LECTURE TITLE:* *" SELECTED TOPICS IN ULTRAFAST & BROADBAND PHOTONIC SIGNAL PROCESSING "* *Thursday, November 21, 20134:30 – 5:30 p.m. @ MSEE B012* Please find more details about the lecture and the speaker in the attached flyer. This lecture is part of Invited Technical Seminar program organised by OSA (Optical Society of America) Purdue Student Chapter and sponsored by OSA. Best regards, Zun Huang OSA Purdue Student Chapter -- Zun(Andy) Huang Research Assistant, PhD student President,Optical Society of America Purdue Student Chapter President, ECE Graduate Student Association Birck Nanotechnology Center, 1205 West State Street, W. Lafayette, IN 47907 (765)494-0215 zun(a)purdue.edu

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FW: Prof. James Cooper Seminar and Reception Nov. 1, 3:30pm MRGN 121
by Turner, Jaime J 01 Nov '13

01 Nov '13

Dear all, Please see below the seminar notice for Prof. Cooper's Faculty Career talk, Friday, Nov. 1st 3:30pm - 4:30pm in MRGN 121. [Celebration of Faculty Careers] The College of Engineering invites you to attend our INAUGURAL COLLOQUIUM SERIES Celebrate our faculty members' diverse impact on education, scholarship, engagement and disciplines. James A. Cooper, Jai N. Gupta Professor of Electrical and Computer Engineering "REAL ENGINEERS GET THEIR HANDS DIRTY" Friday, November 1, 2013 3:30 - 4:30 p.m. presentation, MRGN 121 Reception following in MRGN Café Click HERE<https://engineering.purdue.edu/Engr/AboutUs/Administration/AcademicAffairs/…> for additional presentation information and bio. Jaime Turner Birck Nanotechnology Center Purdue University 1205 West State STreet West Lafayette, IN 47907-2057 (765) 494-3509 jjturner(a)purdue.edu<mailto:jjturner@purdue.edu>

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NSAC: Tip of the Week
by NSAC 29 Oct '13

29 Oct '13

Dear All, NSAC realizes the importance of promoting the best research practices at the Birck Nanotechnology Center. In order to help reach this goal we are launching a strategy called "Tip of the Week". Every week you will find a safety tip in the kitchen tables and in Birck common areas highlighting key points of lab safety and procedures. After several weeks, we will have a quiz game/activity based on these tips and find the most knowledgeable student at Birck. *Tip of the Week #1:**Doors, food and drinks* - No eating, drinking, or chewing gum in research areas including the labs and support galleys. - Doors must be closed and locked at all times. (DO NOT prop doors open.) - Do not touch door knobs or telephones with gloved hands. - Before leaving laboratory, remove and discard gloves, and wash hands (BIO-LABs). Best, Policies and Procedures Committee of NSAC

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Reminder: Meeting today at 11am BRK 1099
by Zun(Andy) Huang 18 Oct '13

18 Oct '13

Dear all, Just a quick reminder, there will be an OSA meeting today at 11AM in Room 1099. We will discuss several following things: 1) Report of Steve Keller about his trip to OSA student leadership conference; 2) Visit of invited speaker Prof. Mark Brongersma from Standford university on Nov. 6th; 3) Chapter social event; 4) Youth education and classroom teaching activities; Food and drinks will be provided. I am looking forward to seeing you there ! Best, Andy -- Zun(Andy) Huang Research Assistant, PhD student President,Optical Society of America Purdue Student Chapter President, ECE Graduate Student Association Birck Nanotechnology Center, 1205 West State Street, W. Lafayette, IN 47907 (765)494-0215 zun(a)purdue.edu

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Mendeley Workshop (Citation Management Software) -- TODAY (10/18) at noon in BRK 2001
by NSAC 18 Oct '13

18 Oct '13

Reminder: Join us *Today, October 18* for an introduction to Mendeley and its many features at *noon* in *BRK 2001*. Food/ refreshments will be provided by NSAC. ---------- Forwarded message ---------- From: NSAC <nsac(a)purdue.edu> Date: Wed, Oct 16, 2013 at 10:21 AM Subject: Mendeley Workshop (Citation Management Software) -- this Friday 10/18 at noon in BRK 2001 To: bnc-grads-list(a)ecn.purdue.edu Birck Grad students, Having difficulty managing your ever-growing collection of literature papers? Looking for a free alternative to EndNote? There is a better way than using folders and subfolders! Mendeley is a free cross-platform application that helps researchers manage and annotate their scientific paper collections. Researchers can also set up collaborative projects, work and discuss in groups, and share data on Mendeley's web platform. Mendeley also integrates well with MS Word and LaTeX for a smooth workflow. Join us *this Friday, October 18* for an introduction to Mendeley and its many features at *noon* in *BRK 2001*. Food/ refreshments will be provided by NSAC. See you there! Manny

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