AJAY SHANBHAG
SENIOR RESEARCH FELLOW
INDIAN INSTITUTE OF TECHNOLOGY MADRAS, INDIA
SENIOR RESEARCH FELLOW
INDIAN INSTITUTE OF TECHNOLOGY MADRAS, INDIA
Hi, I am currently a senior doctoral research fellow in the Centre for Nanoelectromechanical Systems (NEMS) and Nanophotonics (CNNP) at Indian Institute of Technology Madras, India working on an interesting project on Gallium Nitride (GaN) with Professor Amitava DasGupta. The project focusses on Physics based Compact Model development, TCAD simulation, and Characterization of Traps in GaN High Electron Mobility Transistor (HEMTs). I am awarded the Raman-Charpak Fellow for the year 2022. I am working with IEMN, France during my fellowship period under Dr. Farid Medjdoub.
My undergraduate education (B.E) was completed at the Padre Conceicao College of Engineering (PCCE), Goa in Electronics and Telecommunication Engineering. My research interests are in the areas of solid state physics, device modeling, III-V semiconductor technology, TCAD simulation, and characterization of semiconductor devices.
Key research accomplishments
1. Compact modeling: Developed a physics-based GaN HEMT Verilog-A model capturing the effect of traps within the device. The model captures the effects of traps under steady-state and transient conditions. The model is validated with TCAD and experimental data. A good match is observed. Additionally the concept of Negative Potential is analyzed in depth which is the reason behind the transient current characteristics.
2. Novel thermal resistance extraction : Developed a characterization method to characterize the thermal resistance of GaN on Si HEMTs by analyzing the transient drain current under substrate bias stress. The extraction methodology is independent of pulsing. Hence more reliable and accurate.