Patent ID: 8932913
Filing Date: 2015-01-13
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device comprising the steps of: forming an insulating layer; etching the insulating layer to form a first region with a first thickness and second regions with a second thickness smaller than the first thickness; processing an edge portion of the first region into a curved shape with rare gas plasma treatment; forming an oxide semiconductor layer over the insulating layer so as to be in contact with at least the first region having the curved shape; forming a source electrode and a drain electrode electrically connected to the oxide layer; forming a gate insulating layer over the oxide semiconductor layer; and forming a gate electrode over the gate insulating layer so that the gate electrode faces the side surfaces of the first region with the oxide semiconductor layer and the gate insulating layer interposed between the gate electrode and the side surfaces of the first region, wherein the first region is positioned between the second regions, and wherein the oxide semiconductor layer comprises indium, gallium, and zinc.