Patent ID: 8603886

Claim:
A method for fabricating an epitaxial structure, comprising: (a) forming over a temporary substrate a patterned sacrificial layer that partially exposes the temporary substrate; (b) growing laterally and epitaxially a temporary epitaxial film over the patterned sacrificial layer and the temporary substrate; (c) forming over the temporary epitaxial film a first etching-stop layer; (d) forming an epitaxial layer unit over the first etching-stop layer; (e) removing the patterned sacrificial layer using a first etchant, the patterned sacrificial layer having an etching rate greater than that of the temporary epitaxial film; and (f) removing the temporary epitaxial film using a second etchant to separate the temporary substrate from assembly of the first etching-stop layer and the epitaxial layer unit, the temporary epitaxial film having an etching rate greater than that of the first etching-stop layer.