Patent ID: 6683349
Filing Date: 2004-01-27
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor layer having a first conduction type; heavily-doped source/drain layers having the second conduction type, which is opposite to the first conduction type, formed in the semiconductor layer; a gate electrode formed on a channel layer located between said source/drain layers; a body layer having the first conduction type formed in the vicinity of said source layer; and a lightly-doped drain layer having the second conductivity formed between said channel layer and drain layer, wherein said lightly-doped drain layer having the second conduction type is formed as a shallow portion at least below said gate electrode without a layer of the first conduction type disposed between the shallow portion and the gate electrode, and as a deep portion in the vicinity of said heavily-doped drain layer, and said body layer having the first conduction type is formed only below said gate electrode, wherein said shallow portion does not extend beyond the vertical edges of the gate electrode.