Interface Engineering for 2D Phosphorene Based Optoelectronic Devices

Prof. Wei Chen ^1,2

1 Department of Physics National University of Singapore, Singapore 117542, Singapore

   2 Department of Chemistry, National University of Singapore, 117543, Singapore

* Email: phycw@nus.edu.sg

At E408 from 5 to 6 pm 23/05/2019 (Thursday)

Abstract

Two-dimensional (2D) layered materials like graphene and transition metal dichalcogenides (TMDs) have been considered as promising building blocks for the next generation nanoelectronic devices, showing great potentials to extend the scaling limits existing in silicon based complementary metal-oxide-semiconductor field-effect-transistors (CMOS-FET) as well as to serve as a high mobility alternative to organic semiconductors for flexible electronic and optoelectronic devices. As one-atomic or a few atomic thin layers, the interface plays essential role in determining the performance of 2D materials based devices, such as charge injection/collection at metal/2D interfaces, charge carrier traps at the dielectric/2D interfaces, etc. Without precise control of the surface and interface properties, many 2D materials based devices will not function properly.

In this talk, I will summarize and discuss our recent work for interface engineered 2D phosphorene and TMDCs based field-effect-transistors (FETs) and photo-transistors, through the combination of in-situ FET device evaluation and photoelectron spectroscopy investigation. We will particularly emphasize on the electron and hole doping effect on the transport properties and optoelectronic response of phosphorene devices.

CV of Professor Wei Chen (National University of Singapore

Dr Wei Chen is currently an associate professor in both the Chemistry Department and Physics Department at the National University of Singapore (NUS). He received his Bachelor degree in Chemistry from Nanjing University (China) in 2001 and his PhD degree from the Chemistry Department at NUS in 2004. His current research interests include molecular-scale interface engineering for organic, graphene and 2D materials based electronics and optoelectronics, and interface-controlled nanocatalysis for energy and environmental research. He has authored over 280 papers in top scientific journals with more than 11,000 citations and H-index of 56, and selected as 2018 Highly Cited Researchers from Clarivate Analytics. Prof Chen is a receipt of 2008 IPS Omicron Nanotechnology Award, 2012 Singapore Young Scientist Award, and 2016 NUS Dean’s Chair Professorship. He also chaired 2016 Singapore International Chemistry Conference (SICC9) and 2018 National Meeting for Surface Science and Applications.