Patent ID: 6676751
Filing Date: 2004-01-13
Classification: C23C,C30B,H01L

Abstract:
A method of sequentially forming an epitaxial film of a III-V nitride, comprising the steps of:a) providing a substrate; b) arranging the substrate in a reactor of a HVPE system; c) forming, by HVPE at a growth temperature, a first epitaxial layer of the III-V nitride on the substrate to a thickness in the range of from 15 to 75 microns; d) cooling the substrate and the first epitaxial layer of the III-V nitride to a sub-growth temperature, wherein the sub-growth temperature is not more than 50% that of the growth temperature; e) passing an etchant gas through the reactor f) forming, by HVPE at the growth temperature, an additional epitaxial layer of the III-V nitride on an existing epitaxial layer to provide a plurality of epitaxial layers on the substrate, wherein the additional epitaxial layer has a thickness in the range of from 15 to 75 microns; g) cooling the substrate and the plurality of epitaxial layers to the sub-growth temperature; and h) successively repeating steps e) and f) until the epitaxial film has attained a desired total thickness.