Northwestern Events Calendar

Nov
25
2014

MSE Colloquium: Deji Akinwande

recurring see all events in this series

When: Tuesday, November 25, 2014
4:00 PM - 5:00 PM CT

Where: Technological Institute, L361, 2145 Sheridan Road, Evanston, IL 60208 map it

Audience: Faculty/Staff - Student - Public - Post Docs/Docs - Graduate Students

Contact: Department Office   (847) 491-3537

Group: Department of Materials Science and Engineering (MatSci)

Category: Lectures & Meetings

Description:

The Department of Materials Science and Engineering welcomes you to its 2014 Fall Colloquium Series.


Location: Tech L361, 4:00pm

Deji Akinwande
University of Texas at Austin

Adventures with Buckled Atomic Sheets: The Case of Phosphorene and Silicene

Buckled atomic sheets such as phosphorene and silicene promise interesting anisotropic phenomena and strongly coupled multi-physics. Experimental properties and ageing effect are among the biggest topics. Here, we report key results of critical importance for device studies and understanding including phosphorene devices featuring: i) record mobility (μ) ~1560cm2/V.s about an order of magnitude higher than other 2D semiconductors, ii) ambipolar current saturation that is more desirable for optoelectronics than graphene because of its sizeable direct bandgap, and iii) the first demonstration of flexible devices and circuits. Experimental results on silicene represents the first device investigation that is enabled by advanced materials growth and a unique sandwich transfer process, and confirm the graphene-like Dirac transport. In addition, the common air-stability issue of great concern is investigated with microwave impedance microscopy (MIM) revealing that ordinary methods such as Optical and AFM are generally blind as an evaluation technique. Silicene and phosphorene materials show long-term air-stability with engineered protection. Collectively, the record mobility of phosphorene makes it the most compelling 2D semiconductor, while silicene’s allotropic affinity with bulk Si and its low-T growth suggests a more direct path for semiconductor technology integration.

BIO:
Dr. Deji Akinwande received the PhD degree in Electrical Engineering from Stanford University in 2009, where he conducted research on the synthesis, device physics, and circuit applications of carbon nanotubes and graphene. His Master’s research in Applied Physics at Case Western Reserve University pioneered the design and development of near-field microwave probe tips for nondestructive imaging and studies of materials.
He is currently an Assistant Professor with the University of Texas at Austin. The current focus of his research explores materials and electronic systems based on 2D atomic layers. He is a co-inventor of a high-frequency chip-to-chip interconnect and an electrically small antenna for bio-electronics. Prof. Akinwande has been honored with the inaugural IEEE Nano Geim and Novoselov Graphene Prize, the NSF CAREER award, the Army and DTRA Young Investigator awards, the 3M Nontenured Faculty Award, and was a past recipient of fellowships from the Ford Foundation, Alfred P. Sloan Foundation, and Stanford DARE Initiative. He is one of the directors of the NASCENT ERC center at UT Austin. He recently co-authored a textbook on carbon nanotubes and graphene device physics by Cambridge University Press, 2011. His work on flexible graphene systems was selected as among the "best of 2012" by the nanotechweb online technology news portal and has been featured on MIT's technology review and other technical media outlets.

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