Patent ID: 7642605

Claim:
A semiconductor device comprising: a substrate having a main surface; a semiconductor film provided on said main surface, having a channel region formed and having a source region and a drain region formed on opposing sides of said channel region, and having a thickness of larger than 50 nm and at most 150 nm; a gate insulating film provided so as to be in contact with said semiconductor film and containing oxygen; and a gate electrode provided in a position facing said channel region with said gate insulating film being interposed; wherein said semiconductor film contains hydrogen in a proportion of at least 0.5 atomic percent and at most 10 atomic percent, and wherein said semiconductor film has lightly doped drain regions formed between the channel region and the source and drain regions, and wherein said semiconductor film has first and second layers successively stacked on said main surface, and said first layer contains hydrogen in a proportion smaller than a proportion in said second layer.