Patent ID: 7794542

Claim:
A method for fabricating at least one microelectronic device structure, the method comprising: growing, in a growth reactor, single crystal III-V nitride material on and across a surface of a heterogeneous substrate, by a vapor deposition process conducted at elevated growth temperature; growing at least one microelectronic device structure on the III-V nitride material in the growth reactor, wherein the at least one microelectronic device structure comprises a n-type III-V nitride layer and a p-type III-V nitride layer; and separating the heterogeneous substrate from the III-V nitride material, while the III-V nitride material is at temperature within 300° C. of said elevated growth temperature and prior to cooling of said III-V nitride material to a temperature more than 300° C. below said elevated growth temperature, wherein said separating comprises chemical action on the heterogeneous substrate.