Patent ID: 7851378

Claim:
A method for growing a germanium (Ge) epitaxial layer on a patterned structure with a cyclic annealing, comprising steps of: (a) obtaining a silicon (Si) substrate and depositing a Si buffer layer and a Si—Ge epitaxial layer (Si 0.8 Ge 0.2 ) through an ultra high vacuum chemical vapor deposition (UHV/CVD); (b) processing a photolithography by pasting a layer of photoresist on said Si—Ge epitaxial layer and projecting a required pattern on said photoresist with a photo mask; (c) processing an etching to remove an exposed part of said Si—Ge epitaxial layer and then remove said photoresist over an unexposed part of said Si—Ge epitaxial layer to obtain a patterned structure of said Si—Ge epitaxial layer; (d) after said photolithography and said etching, depositing a Ge epitaxial layer on said Si—Ge epitaxial layer by using a reaction gas; and (e) processing a cyclic annealing to confine dislocation defects on sidewalls of said Si—Ge epitaxial layer.