Patent ID: 9590111
Date: 2017-03-07
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: an oxide semiconductor film; a gate electrode layer, the oxide semiconductor film overlapping the gate electrode layer; a gate insulating film between the oxide semiconductor film and the gate electrode layer; a metal oxide film overlapping the oxide semiconductor film, the oxide semiconductor film positioned between the metal oxide film and the gate insulating film; and a source electrode layer and a drain electrode layer over the metal oxide film, wherein the metal oxide film comprises an In—Metal—Zn oxide in which an atomic ratio of Metal is higher than that of In, wherein Metal is any one if Ti, Ga, Y, Zr, La, Ce, Nd, Sn, and Hf, wherein the metal oxide film covers a channel region and a side surface of the oxide semiconductor film, wherein the metal oxide film has a first opening and a second opening reaching the oxide semiconductor film, and wherein the source electrode layer is electrically connected to the oxide semiconductor film through the first opening, and the drain electrode layer is electrically connected to the oxide semiconductor film through the second opening.