Patent ID: 7981734
Filing Date: 2011-07-19
Classification: H01L

Abstract:
1. A manufacturing method of a thin film transistor comprising: forming a source/drain electrode on a substrate; forming low resistance conductive thin films on the source/drain electrode; forming an oxide semiconductor thin film layer on the low resistance conductive thin films; forming a first gate insulating film on the oxide semiconductor thin film layer; etching the first gate insulating film, the low resistance conductive thin films, and the oxide semiconductor thin film layer such that (i) side surfaces of the first gate insulating films, corresponding side surfaces of the low resistance conductive thin films, and corresponding side surfaces of the oxide semiconductor thin film layer coincide with each other in a channel width direction of a channel of the thin film transistor, and (ii) a width of the first gate insulating film is wider than a width of the source/drain electrode in the channel width direction of the channel; forming a second gate insulating film on the first gate insulating film; and mounting a gate electrode over the second gate insulating film.