Patent ID: 8993424
Filing Date: 2015-03-31
Classification: H01L,Y10S

Abstract:
1. A method for forming a transistor comprising: providing a semiconductor substrate; introducing dopant impurities of a first impurity type into a transistor region of said semiconductor substrate, said transistor region including a channel region and source/drain regions, said introducing dopant impurities comprising ion implantation; forming a silicon carbide layer over said channel region, said silicon carbide layer being undoped; forming a silicon layer over said silicon carbide layer; forming a gate dielectric over said silicon layer over said channel region; forming a gate electrode over said gate dielectric over said channel region; and after said forming a gate electrode, performing an angled ion implantation operation to introduce further dopant impurities of said first impurity type, into said semiconductor substrate at edges of said channel region, said angled ion implantation operation taking place when regions immediately adjacent said channel region include an exposed surface of said silicon layer.