Patent ID: 6326285
Filing Date: 2001-12-04
Classification: H01L

Abstract:
A method of forming multiple SOI wafers, the method comprising:forming an oxide surface on a first side of each of a plurality of individual wafers;forming a hydrogen rich region at a preselected depth on a second side of each of the plurality of individual wafers, thereby defining a device region above the hydrogen rich region and defining a mechanical region between the hydrogen rich region and the first side on each of the plurality of individual wafers;bonding the plurality of wafers to form a stacked configuration having at least a top wafer, a middle wafer and a bottom wafer, wherein the first side of the middle wafer is bonded to the second side of the bottom wafer and the second side of the middle wafer is bonded to the first side of the top wafer; andheat treating the stacked configuration so as to separate the top wafer, the middle wafer and the bottom wafer at the hydrogen rich region of the top wafer, the middle wafer and the bottom wafer thereby forming at least two SOI wafers, whereina first SOI wafer includes the device region from the middle wafer and the mechanical region from the top wafer, anda second SOI wafer includes the device region from the bottom wafer and the mechanical region from the middle wafer.