Patent ID: 9287411
Filing Date: 2016-03-15
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising a transistor, the transistor comprising: a gate electrode over a substrate; a gate insulating film over the gate electrode; a multilayer film over the gate insulating film; a pair of electrodes in electrical contact with the multilayer film; a first oxide insulating film over the multilayer film and the pair of electrodes; and a second oxide insulating film over the first oxide insulating film, wherein the multilayer film includes an oxide semiconductor film and an oxide film over the oxide semiconductor film, wherein the oxide semiconductor film has an amorphous structure or a microcrystalline structure, wherein the second oxide insulating film is an oxide insulating film containing more oxygen than that in the stoichiometric composition, wherein each of the oxide semiconductor film and the oxide film includes In-M-Zn oxide, wherein the M represents Al, Ti, Ga, Y, Zr, La, Ce, Nd, or Hf, and wherein a proportion of M atoms in the oxide film is higher than a proportion of M atoms in the oxide semiconductor film.