Organic field-effect transistors/thin-film transistors (FETs/TFTs) receive significant attention because of their potential use in flexible electronics. The operating voltage, operational stability, contact resistance, and process simplicity are some of the crucial aspects, which are taken into account for designing high performance FETs. By choosing a suitable materials and interfaces, and sometimes by introducing some thin buffer layers to reduce charge trapping, high performance can be achieved in devices. There has always been stability concern in organic TFTs, such as degradation due to ambient, bias-stress instability, and repeatability issues. Such studies are mostly done for rigid devices, but scarce for flexible devices. Low-voltage (< 3V) flexible TFTs with various promising new semiconductors and comprehensive study of environmental and bias stress were reported recently. It was shown that some of the flexible organic TFTs can exhibit similar or better bias stress stability and channel sheet resistance than those for hydrogenated amorphous silicon TFTs, though fabricated at much lower temperatures.
Shree Prakash Tiwari is an Assistant Professor of Electrical Engineering at IIT Jodhpur. Prior to joining IIT Jodhpur in May 2011, he worked as a Postdoctoral Fellow at School of Electrical and Computer Engineering at Georgia Institute of Technology, Atlanta, USA, for about three years (2008 to 2011). He had completed his Ph.D. in Microelectronics from the Department of Electrical engineering at IIT Bombay in 2008. During Ph.D., he also worked at Nanyang Technological University, Singapore for about 7 months (August 2005 to March 2006). Prior to Joining Ph.D. in 2003, he received M.Sc. in Electronics from DDU Gorakhpur University, India, and worked as a project trainee for six months in VLSI:FAB division of Semiconductor Complex Ltd. (now Semiconductor Laboratory), Mohali, India in year 2001/02. Dr. Tiwari’s primary research interests are Organic/Flexible Electronics, and Semiconductor Devices. His current research work includes performance and stability of organic TFTs, and high-k gate dielectric materials for low voltage flexible electronics. He has contributed in 29 international conference presentations/papers, 2 patents, and co-authored 24 journal publications in peer-reviewed journals, many of them in Organic Electronics and Applied Physics Letters.