In HEMT, why Ids starts from negative by applying positive Gate voltage(Vgs=1V or 2V) inID-VD Curve?

Hello, everybody ! I've recently started device modeling (AlGaN/GaN HEMT) using Sentaurus TCAD and I'm having difficulty in ID-VD graph. My Current Starts from negative when I apply positive gate...

30 June 2016 3,886 5 View