Patent ID: 9633913
Date: 2017-04-25
CPC Classifications: G01N,H01L

Claim:
1. A method of evaluating an epitaxial wafer, comprising: performing evaluation of the epitaxial wafer by detecting, as a light point defect, an abnormal substance selected from the group consisting of a defect and a surface deposit of the epitaxial wafer to be evaluated, wherein the evaluation of the epitaxial wafer is performed with a surface inspection apparatus including two types of incidence systems with different incidence angles and two types of light receiving systems with different light receiving angles, wherein, among the two types of incidence systems, the incidence system with an incident angle smaller than the incident angle of the other incidence system is referred to as a low angle side incidence system and the other incidence system is referred to as a high angle side incidence system, and among the two types of light receiving systems, the light receiving system with a light receiving angle smaller than the light receiving angle of the other light receiving system is referred to as a low angle side light receiving system and the other light receiving system is referred to as a high angle side light receiving system, and wherein the performing evaluation of the epitaxial wafer is based on