Patent ID: 8314032
Filing Date: 2012-11-20
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming, over a substrate, a source electrode and a drain electrode from a metal film and a channel layer from oxide semiconductor; forming a gate insulating film over the source electrode, the drain electrode, and the channel layer; forming a conductive film over the gate insulating film coating the conductive film with negative resist; exposing the negative resist to light from a back of the substrate using the source electrode and the drain electrode as a mask; removing the negative resist except for an exposed part of the negative resist; forming a gate electrode by etching the conductive film using the exposed part as an etching mask; forming a first interconnect from the metal film on the substrate together with the source electrode and the drain electrode; exposing the negative resist to light from the back of the substrate using, as a mask, the first interconnect as well as the source electrode and the drain electrode; exposing part of the negative resist just above the first interconnect to light from a front side of the substrate through a photo mask; removing the negative resist except exposed part of the negative resist; and forming a second interconnect together with the age electrode by etching the conductive film using the exposed part as an etching mask.