Patent ID: 8709954

Claim:
A wafer recycling method, comprising: varying a temperature and pressure conditions to remove a first semiconductor layer including GaN deposited on a wafer by separating the first semiconductor layer into a liquid-phase material and a gas-phase material; removing a remaining semiconductor layer on the wafer through a chemical or physical process; and washing the wafer via a chemical washing process that uses a first chemical solution containing ammonium hydroxide (NH 4 OH) for removing an organic pollutant and a second chemical solution containing hydrochloric acid for removing an inorganic pollutant, wherein the GaN is separated into a liquid-phase Ga and a gas-phase N by setting the temperature within a range of about 2000 K-about 2490 K and the pressure using argon gas within about 1000 bar-about 60,000 bar by a metal organic chemical vapor deposition equipment.