Patent ID: 6545337
Filing Date: 2003-04-08
Classification: H01L

Abstract:
A semiconductor integrated circuit device comprising:a supporting substrate; an oxide layer disposed on the supporting substrate; a polycrystalline semiconductor layer formed on the oxide layer; a first island region having one conduction type; a second island region which is formed of a burial layer of a lightly-doped impurity diffused layer having an opposite conduction type, said first island region and said second island region being separated from each other by said polycrystalline semiconductor layer; a first buried layer of a highly-doped impurity diffused layer having the one conduction type, said first buried layer is formed on the periphery of said first island region; a second buried layer of a highly-doped impurity diffused layer having the opposite conduction type, said second buried layer is formed on the periphery of said second island region; a first transistor formed in said first island region; a second transistor formed in said second island region, said first and second transistors having different conduction types, wherein the surfaces of said polycrystalline semiconductor layer and said first and second island regions are made substantially flat.