Patent ID: 7745277

Claim:
A method for manufacturing a semiconductor device, comprising steps of: forming a buried oxide layer on a silicon substrate; forming a semiconductor layer on the buried oxide layer such that the buried oxide layer is disposed between the semiconductor layer and the substrate; performing a first ion-implanting step of an expansion element in a first region of the substrate while masking a second region of the substrate; performing a second ion-implanting step of a compression element in the second region of the substrate while masking the first region of the substrate, wherein the second ion-implanting step is separate from the first ion-implanting step; expanding the expansion element to expand the first region of the substrate to push up a first portion of the semiconductor layer and a first portion of the buried oxide layer; compressing the compression element to compress the second region of the substrate to pull down a second portion of the semiconductor layer and a second portion of the buried oxide layer; forming a first gate oxide layer of an N type device on the first portion of the semiconductor layer; forming a first gate electrode on the first gate oxide layer; forming a second gate oxide layer of a P type device on the second portion of the semiconductor layer; and forming a second gate electrode on the second gate oxide layer.