Patent ID: 7842616

Claim:
A method for fabricating a corrugated structure in a semiconductor surface, comprising: providing a first semiconductor layer; providing a second semiconductor layer on the first semiconductor layer, where the second semiconductor layer comprises a semiconductor substrate; forming a plurality of line structures in the first semiconductor layer comprising: depositing a third semiconductor layer on the first semiconductor layer; etching the third semiconductor layer to create a plurality of line structures in the third semiconductor layer; depositing a fourth semiconductor layer on the plurality of line structures in the etched third semiconductor layer etching the fourth semiconductor layer to create a plurality of line structure in the fourth semiconductor layer; removing the plurality of line structures in the third semiconductor layer; depositing a fifth semiconductor layer on the plurality of line structures in the etched fourth semiconductor layer; etching the semiconductor fifth layer to create a plurality of line structures in the fifth semiconductor layer; removing the plurality of line structures in the fourth semiconductor layer; and using the plurality of line structures in the fifth semiconductor layer as a mask to etch first layer to form a plurality of line structures in the first semiconductor layer; using the plurality of line structure as a mask to etch the surface of the second semiconductor layer; and annealing the etched second semiconductor layer in a hydrogen atmosphere to form the corrugated surface in the second semiconductor layer.