Patent ID: 6805744
Filing Date: 2004-10-19
Classification: C30B,H01L,Y02E

Abstract:
A method of forming a semiconductor structure comprising:providing a single crystal semiconductor substrate of GaP; and fabricating a graded composition buffer including a plurality of epitaxial semiconductor Inx, (AlyGa1âˆ’x)1âˆ’xP alloy layers where y is greater than zero, said buffer comprising a first alloy layer immediately contacting the substrate having a lattice constant that is nearly identical to that of the substrate and a growth temperature greater than 650Â° C., subsequent alloy layers having lattice constants that differ from adjacent layers by less than 1%, and a final alloy layer having a lattice constant that is substantially different from the substrate, wherein growth temperature of the final alloy layer is at least 20Â° C. less than the growth temperature of the first alloy layer.