Patent ID: 9425045
Filing Date: 2016-08-23
CPC Classification: H01L

Claim Text:
1. A method for manufacturing a semiconductor device comprising the step of: forming an oxide semiconductor film serving as a channel formation region of a transistor by a sputtering method at a temperature higher than 300° C. and lower than or equal to 500° C. so that the number of water molecules eliminated from the oxide semiconductor film is 0.5/nm wherein the number of water molecules is calculated by comparing a first value of integral of a TDS spectrum of water molecules in the oxide semiconductor film with a second value of integral of a TDS spectrum of hydrogen molecules in a reference sample, wherein the first value of integral and the second value of integral are calculated within a temperature range of higher than or equal to 150° C. and lower than or equal to 400° C., and wherein the reference sample is a silicon wafer.