Patent ID: 6143477
Filing Date: 2000-11-07
Classification: G03F,H01L

Abstract:
A method of ashing or cleaning a wafer, comprising:(a) introducing oxygen gas into an apparatus including a reaction chamber having therein a semiconductor wafer to be ashed or cleaned;(b) producing first light of wavelength by means of a first UV (ultraviolet) lamp, and directing the first light into the oxygen gas, causing generation of ozone gas, the first UV lamp being a xenon eximer lamp;(c) producing second light of wavelength by means of a second UV lamp, and directing that second light into the ozone gas having a high absorption coefficient, causing generation of oxygen radicals, the second UV lamp being one of a krypton chloride lamp and a krypton fluoride lamp; and(d) passing gas including the oxygen radicals along a surface of the wafer in the reaction chamber, causing degeneration of organic material thereon.