Patent ID: 9293589
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming a gate electrode; forming a gate insulating layer over the gate electrode; forming an oxide semiconductor layer over the gate insulating layer, the oxide semiconductor layer overlapping with the gate electrode; forming a source electrode and a drain electrode over the oxide semiconductor layer; forming a first insulating layer over the source electrode and the drain electrode under a condition with a first gas flow rate, a first pressure, a first RF power, and first substrate temperature, the first insulating layer being in contact with part of the oxide semiconductor layer; introducing oxygen into the first insulating layer by a plasma treatment under oxygen atmosphere; and forming a second insulating layer over the first insulating layer under a condition with a second gas flow rate, a second pressure, a second RF power, and second substrate temperature, wherein a thickness of the first insulating layer is more than 10 nm and less than 100 nm, wherein the second insulating layer is thicker than the first insulating layer, wherein the first gas flow rate is smaller than the second gas flow rate, wherein the first pressure is smaller than the second pressure, wherein the first RF power is smaller than the second RF power, and wherein the first substrate temperature is higher than the second substrate temperature.