Patent ID: 8884287
Filing Date: 2014-11-11
Classification: C23C,H01L,H04M

Abstract:
1. A semiconductor device comprising: a gate electrode over an insulating surface; an insulating layer over the gate electrode; a first oxide semiconductor layer over the insulating layer, the first oxide semiconductor layer containing indium and zinc; a second oxide semiconductor layer over the first oxide semiconductor layer, the second oxide semiconductor layer containing indium, zinc, and silicon; a channel protective layer over and in contact with the second oxide semiconductor layer; and a source electrode and a drain electrode over the channel protective layer, the source electrode and the drain electrode being electrically connected to the second oxide semiconductor layer, wherein a concentration of silicon in the second oxide semiconductor layer is larger than a concentration of silicon in the first oxide semiconductor layer, and wherein crystallinity of the first oxide semiconductor layer is higher than crystallinity of the second oxide semiconductor layer.