Patent ID: 6124154
Filing Date: 2000-09-26
Classification: H01L

Abstract:
A fabrication process for a thin film transistor which includes at least a first process step which involves the formation of a semiconductor layer on a substrate which is isolated from atmosphere, followed by crystallization of said semiconductor layer in a non-oxidizing atmosphere without exposing said substrate to atmosphere, followed by formation of a first gate insulator layer on top of said semiconductor layer during which said substrate is not exposed to atmosphere;a second process step, following completion of the first process step, which involves thermal processing of said first gate insulator layer and said semiconductor layer;a third process step, following completion of the second process step, which involves a single mask in patterning of said first gate insulator layer and said semiconductor layer, defining and exposing an edge of said semiconductor layer and said first gate insulator;and a fourth process step, following completion of the third process step, which involves hydrogenation of said substrate followed by formation of a second gate insulator layer on the surface of said first gate insulator layer and on the exposed edge.