Patent ID: 8772771
Filing Date: 2014-07-08
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming a first electrode layer; forming a first oxide film over the first electrode layer; forming an oxide semiconductor film over the first oxide film; forming a second oxide film over the oxide semiconductor film; etching the oxide semiconductor film and the second oxide film to form a column object of the oxide semiconductor film and the second oxide film over the first oxide film; forming an insulating film over the column object; forming an island-shaped conductive film over the insulating film; anisotropically etching the insulating film and the island-shaped conductive film to form a gate insulating film and a gate electrode layer, and to expose the second oxide film of the column object; and forming a second electrode layer electrically connected to the second oxide film of the column object.