Patent ID: 7709277
Filing Date: 2010-05-04
Classification: C09K,H01L

Abstract:
1. A method of manufacturing a semiconductor device having a multi-bridge-channel field effect transistor (MBCFET) structure, comprising: providing a structure having stacked Si bridge layers and SiGe interbridge layers, respectively, and supported by at least one bridge-support structure; and applying an etchant composition to side surfaces of the SiGe bridge layers, the etchant including peracetic acid (PAA), and a fluorinated acid, wherein a relative amount of PAA in the composition is sufficient to yield an etch rate ratio of SiGe:Si for NMOS transistors of the MBCFET device that is substantially the same as an etch rate ratio of SiGe:Si for PMOS transistors of the MBCFET device.