Patent ID: 7387989
Filing Date: 2008-06-17
Classification: C30B,Y10T

Abstract:
1. A cleaning method of an Al x Ga y In 1-x-y N substrate, wherein 0<x≦1, 0≦y≦1, x+y≦1, said Al as said cleaning solution, one of an ammonia water having an ammonia concentration of at least 0.5 weight percent, an ammonia hydroxide/hydrogen peroxide mixture having a hydrogen peroxide solution concentration of at least 0.1 weight percent and an ammonia concentration of at least 0.1 weight percent, and an organoalkali aqueous solution having an organoalkali concentration of at least 0.5 weight percent is used, said organoalkali aqueous solution is organoalkali dissolved in water, said organoalkali being one of tetramethylammonium hydroxide and 2-hydroxyethyl trimethylammonium hydroxide, and a soaking time of said Al