Patent ID: 9211625
Filing Date: 2015-12-15
Classification: B24B,H01L

Abstract:
1. A sapphire substrate flattening method comprising: an ingot slicing step of slicing a sapphire single-crystal ingot to obtain a sapphire substrate; an annealing step of annealing said sapphire substrate obtained by said ingot slicing step, wherein said annealing step is performed by accommodating said sapphire substrate in an annealing chamber, heating said annealing chamber and supplying an annealing gas to said annealing chamber; a wafer mounting step of mounting said sapphire substrate processed by said annealing step on a stage having a holding surface in a condition where a first surface of said sapphire substrate is in contact with said holding surface of said stage through a liquid resin; a resin curing step of curing said liquid resin after performing said wafer mounting step; a first grinding step of grinding a second surface of said sapphire substrate opposite to said first surface after performing said resin curing step; a resin removing step of removing said liquid resin cured on said first surface of said sapphire substrate after performing said first grinding step; and a second grinding step of grinding said first surface of said sapphire substrate after performing said resin removing step.