Patent ID: 6458635
Filing Date: 2002-10-01
Classification: H01L,Y10S

Abstract:
A method of manufacturing a thin film semiconductor device comprising a substrate having an insulating surface, gate electrodes disposed on said insulating surface, gate insulating films disposed on upper portions of said gate electrodes, and thin film semiconductors disposed on said gate insulating films and including channel forming regions, source regions and drain regions, said method comprising the steps of:forming a gate electrode film of metal on said substrate; forming a gate insulating film on said gate electrode film under a low pressure; forming an amorphous semiconductor thin film on said gate insulating film under a low pressure without exposing said gate insulating film to the atmosphere; crystallizing a part of said amorphous semiconductor thin film without exposing said amorphous semiconductor thin film to the atmosphere; forming an etching stopper insulating film on said semiconductor thin film without exposing said semiconductor thin film to the atmosphere; taking out said substrate into the atmosphere; forming an etching stopper insulating film on said channel forming region; shaping said thin film semiconductor and said gate insulating film into a desired shape, forming a semiconductor film containing trivalent or pentavalent impurities; forming a conductive film on said semiconductor film; and shaping said semiconductor film containing said impurities and said conductive film into the same plane shape; whereby a thin film semiconductor unit in which said channel forming region is made of polycrystal, and a thin film semiconductor unit in which said channel forming region is made of amorphous, are formed on said substrate.