Patent ID: 9437744
Filing Date: 2016-09-06
CPC Classification: H01L

Claim Text:
1. A method for manufacturing a semiconductor device, comprising steps of: forming a first oxide semiconductor film over an insulating surface; forming a first film having conductivity over the first oxide semiconductor film; forming a first resist mask over the first film having conductivity; etching the first film having conductivity using the first resist mask as a mask to form a second film having conductivity; removing the first resist mask; etching the first oxide semiconductor film using the second film having conductivity as a mask to form a second oxide semiconductor film; forming a source electrode and a drain electrode over the insulating surface, the second oxide semiconductor film, and the second film having conductivity; forming a second resist mask over the second film having conductivity, the source electrode, and the drain electrode; etching the second film having conductivity using the second resist mask as a mask to form a pair of third films having conductivity; removing the second resist mask; forming a gate insulating film over the second oxide semiconductor film, the source electrode, the drain electrode, and the pair of third films having conductivity; and forming a gate electrode over the gate insulating film to overlap with the second oxide semiconductor film.