Patent ID: 9368636
Filing Date: 2016-06-14
CPC Classification: H01L

Claim Text:
1. A method for manufacturing a semiconductor device, the method comprising the steps of: forming a stacked film comprising a first oxide semiconductor layer and a second oxide semiconductor layer over a substrate; forming a mask layer over the stacked film; performing a first dry etching treatment to remove a part of the stacked film by etching the stacked film using the mask layer, thereby forming a reaction product on a side surface of the stacked film; removing the mask layer; performing a wet etching treatment to remove the reaction product after removing the mask layer; forming a source electrode and a drain electrode over the stacked film; and forming a third oxide semiconductor layer, a gate insulating film and a gate electrode over the stacked film, the source electrode and the drain electrode, wherein the gate insulating film is over the third oxide semiconductor layer, and wherein the gate electrode is over the gate insulating film.