Patent ID: 8222640
Filing Date: 2012-07-17
Classification: H01L

Abstract:
1. A semiconductor device comprising: a gate electrode over a substrate; a gate insulating film over the gate electrode; a first semiconductor film over the gate electrode with the gate insulating film interposed therebetween; a channel protection layer over the first semiconductor film and in contact with the first semiconductor film; a second semiconductor film over the gate insulating film and in contact with a first side surface of the first semiconductor film and with a first side surface of the channel protection layer; a third semiconductor film over the gate insulating film and in contact with a second side surface of the first semiconductor film and with a second side surface of the channel protection layer; a first impurity semiconductor layer over the second semiconductor film; a second impurity semiconductor layer over the third semiconductor film; and a source electrode and a drain electrode over and in contact with the first impurity semiconductor layer and the second impurity semiconductor layer, respectively, wherein a thickness of the second semiconductor film is larger than a thickness of the first semiconductor film.