Patent ID: 9691860
Date: 2017-06-27
CPC Classifications: H01L

Claim:
1. A method to form a strain-relieved buffer (SRB), the method comprising: forming a first silicon-germanium (SiGe) layer directly on a surface of a bulk silicon (Si) substrate; patterning the first SiGe layer to form at least two SiGe structures so there is a space between the at least two SiGe structures; forming an oxide on the at least two SiGe structures; mesa annealing the at least two SiGe structures; removing a portion of the oxide to expose a top portion of the at least two SiGe structures; and forming a second SiGe layer on the exposed top portion of the at least two SiGe structures, the second SiGe layer covering the space between the at least two SiGe structures.