Patent ID: 9112036
Filing Date: 2015-08-18
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: forming an oxide semiconductor film; forming a source electrode layer and a drain electrode layer electrically connected to the oxide semiconductor film; forming a gate electrode layer over the oxide semiconductor film; forming an insulating film including a metal element over the oxide semiconductor film; and forming low-resistance regions in the oxide semiconductor film so as to sandwich a channel formation region in the oxide semiconductor film, the low-resistance regions having a resistance lower than a resistance of the channel formation region and including a dopant, wherein the low-resistance regions are formed by adding the dopant to the oxide semiconductor film through the insulating film, wherein each of the low-resistance regions includes a first region and a second region, wherein the first region is not overlapped with the gate electrode layer, the source electrode layer and the drain electrode layer, wherein the second region is overlapped with the source electrode layer or the drain electrode layer, and wherein a resistance in the second region is higher than a resistance in the first region.