Patent ID: 9551653
Date: 2017-01-24
CPC Classifications: G01N,G03F,H01L

Claim:
1. A monitoring method, comprising: providing a chamber having a susceptor, wherein the chamber comprises a gas distributor disposed in an upper portion of the inside thereof, wherein the gas distributor comprises a space configured to mix reaction gases, and a baffle plate configured to supply the reaction gases to the inside of the chamber; providing a polarizing spectroscopic reflector module disposed in a center of a top of the chamber and that vertically passes through a central portion of the baffle plate; placing a wafer on the susceptor in the inside of the chamber; forming a hole in the wafer by performing an etching process using the chamber; radiating a first polarized light from the polarizing spectroscopic reflector module onto the hole of the wafer while performing the etching process; sensing a first polarized light reflected by the wafer while performing the etching process; radiating a second polarized light from a polarizing spectroscopic reflector module onto the hole of the wafer while performing the etching process, wherein the first polarized light is polarized to a first direction and wherein the second polarized light is polarized to a second direction different from the first direction; sensing a second polarized light by the wafer while performing the etching process; and comparing a first spectrum of the first polarized light reflected by the wafer with a second spectrum of the second polarized light reflected by the wafer while performing the etching process.