Patent ID: 8247276
Filing Date: 2012-08-21
Classification: H01L

Abstract:
1. A method for manufacturing a transistor, comprising: forming a first conductive film over a substrate; forming a first resist over the first conductive film; selectively etching the first conductive film using the first resist as a mask to form a gate electrode layer; forming a gate insulating layer over the substrate and the gate electrode layer; forming an oxide semiconductor film over the gate insulating layer; forming a second conductive film over the oxide semiconductor film; forming a second resist over the second conductive film; selectively etching the oxide semiconductor film and the second conductive film using the second resist as a mask to form an oxide semiconductor layer and a conductive layer; forming a third conductive film over the gate insulating layer and the conductive layer; forming a third resist over the third conductive film; selectively etching the third conductive film using the third resist as a mask to form a source electrode layer and a drain electrode layer; and performing an oxidation treatment using the third resist as a mask to form a pair of conductive layers between the oxide semiconductor layer and each of the source electrode layer and the drain electrode layer, and to form a metal oxide layer over the oxide semiconductor layer.