Patent ID: 7812396

Claim:
A semiconductor device comprising: a first semiconductor region and second semiconductor region including impurities formed on an insulating layer formed on a semiconductor substrate; an insulator formed between said first semiconductor region and said second semiconductor region; a channel layer formed on said first semiconductor region and said second semiconductor region, said channel layer being perpendicular to a direction in which said first semiconductor region and said second semiconductor region are extended, said channel layer including both a different type of impurities and the same type of impurities as said impurities included in said first semiconductor region and said second semiconductor region; a first impurity diffusion control film formed between said first semiconductor region and said channel layer, and a second impurity diffusion control film formed between said second semiconductor region and said channel layer, said first impurity diffusion control film and said second diffusion control film having thickness of 0.5 nm to 1.0 nm respectively; a gate insulating film formed on said channel layer; and a gate electrode formed on said gate insulating film.