Patent ID: 9281233
Filing Date: 2016-03-08
CPC Classification: H01L

Claim Text:
1. A method of preparing a bonded structure, the method comprising the following steps in order: (a) implanting helium ions through a front surface of a monocrystalline silicon substrate, wherein the monocrystalline silicon substrate comprises two major, generally parallel surfaces, one of which is the front surface of the monocrystalline silicon substrate and the other of which is the back surface of the monocrystalline silicon substrate, a circumferential edge joining the front and back surfaces, and a central plane between the front and back surfaces, and further wherein the helium ions are implanted to an average depth D (b) implanting hydrogen ions through the front surface of the monocrystalline donor substrate to an average depth D (c) annealing the monocrystalline silicon substrate at a temperature between about 200° C. and about 350° C. for between about 2 hours and about 10 hours to thereby form a cleave plane in the monocrystalline silicon substrate, the cleave plane having an average depth equal to D (d) bonding the front surface of the monocrystalline silicon substrate having the cleave plane therein to a surface of a carrier substrate to thereby form the bonded structure, wherein the carrier substrate is a semiconductor wafer comprising a material selected from the group consisting of silicon, sapphire, quartz, gallium arsenide, silicon carbide, silicon germanium, and germanium; and (e) annealing the bonded structure at a temperature between about 150° C. and about 350° C. for a duration between about 1 hour and about 5 hours.