Patent ID: 6881645
Filing Date: 2005-04-19
Classification: H01L

Abstract:
1. A method for preventing a bending phenomenon of a silicon on insulator (SOI) layer, the method comprising: forming a trench in a SOI layer of a SOI-type substrate, wherein said forming of a trench further comprises: stacking an etch-stop layer on the SOI-type substrate, and forming a pattern exposing a trench area, and etching the SOI layer of the SOI-type substrate, using the pattern as an etching mask, for form a trench; and forming a single crystalline silicon layer on a sidewall of the trench, wherein the step of forming the single crystalline silicon layer comprises: conformally stacking an amorphous silicon layer on an overall surface of the SOI-type substrate including the trench; annealing the SOI-type substrate to achieve solid phase epitaxial growth (SPE) at the amorphous silicon layer contacted with a sidewall of the trench; stacking a buried oxide layer to fill the trench; and performing a planarization etching process to remove the buried oxide layer over an active region.