Events Calendar

Towards High Performance III-V Semiconductor Nanowire and Tube Based Devices

Speaker: Dr. Xiuling Li, Assistant Professor, Department of Electrical and Computer Engineering, University of Illinois, Urbana-Champaign

Talk Title: Towards High Performance III-V Semiconductor Nanowire and Tube Based Devices

Abstract: This talk focuses on two types of III-V compound semiconductor nanotechnology building blocks and their applications in nanoelectronics and nanophotonics: nanowires and self-rolled-up tubes.

Interest in semiconductor nanowires have increased exponentially over the past decade because of their unique optical and electrical properties. Integration of semiconductor nanowire based devices has been challenging for vertical nanowire devices since ex-situ assembly techniques are required to align planar nanowire devices. I will present our discovery of a type of nanowires that is planar, self-aligned, twin-defect free, high carrier mobility, and transfer-printable. The planar nanowire growth and doping mechanism by MOCVD, as well as the device characteristics of a long channel MESFET and HEMT using such GaAs nanowire as the channel material will be analyzed.

Self-rolled-up tubes on the other hand is a relatively new platform that possesses the potential to provide a wide range of functionalities. It is formed by a combination of top-down and bottom-up approach through the self-rolling of strained thin films. This allows feasible large area assembly and integration with existing semiconductor technology, while maintaining the control of the tube size and heterojunction formation in the tube wall. I will discuss the formation process, large area assembly, and optical characterization of InxGa1-xAs/GaAs micro and nanotubes with active light emitting media incorporated in the tube wall. Device prospects of SNTs for nanophotonics will be explored.

Biography: Xiuling Li received her Ph.D. degree from the University of California at Los Angeles. She joined the faculty of the University of Illinois in 2007, after working at a startup company for six years. She is currently an assistant professor in the Department of Electrical and Computer Engineering. Her current research interests are in the area of nanostructured semiconductor materials and devices. She has won the NSF CAREER award (2008) and DARPA Young Faculty Award (2009). Her group’s work on the planar nanowires has won one of the best student paper awards at the 2008 IEEE LEOS annual meeting. The micro and nanotube work has been identified as an outstanding symposium paper presented at the 2008 MRS meeting.

Host: P. Daniel Dapkus

Location: John Stauffer Science Lecture Hall (SLH) - 102

Audiences: Everyone Is Invited

Contact: Eliza Aceves