Patent ID: 8187901
Filing Date: 2012-05-29
Classification: B28B,H01L

Abstract:
1. A method of manufacturing an epitaxial formation support substrate, comprising: positioning a first side of an uncured support substrate against a first surface of a first reference plate, the uncured support substrate having a second side opposite the first side and coefficient of thermal expansion (CTE) substantially similar to N-type gallium nitride (GaN); positioning a second surface of a second reference plate against the second side of the uncured support substrate to form a stack, the first and second surfaces of the first and second reference plates including uniformly flat portions in contact with the first and second sides of the uncured support substrate, respectively; firing the stack to sinter the uncured support substrate; and removing the support substrate from between the first and second reference plates, wherein at least one of the first and second sides of the support substrate includes a planar surface that is at least substantially uniformly flat.