Patent ID: 6014223
Filing Date: 2000-01-11
Classification: G01N

Abstract:
A method for inspecting an impurity-doped polysilicon layer having an unknown impurity concentration, comprising the steps of:(1) preestablishing the reflectivity versus impurity concentration for the impurity-doped polysilicon layer, wherein the impurity-doped polysilicon layer is formed by conducting an ion implantation process at an energy of 10 KeV to 120 KeV to form an impurity concentration of 1.times.10.sup.11 to 5.times.10.sup.16 atoms/cm.sup.2 ;(2) illuminating the impurity-doped polysilicon layer;(3) measuring the reflectivity value of the impurity-doped polysilicon layer; and(4) using a mapping transformation based on the preestablished reflectivity versus impurity concentration characteristic to find the corresponding value of the impurity concentration of the impurity-doped polysilicon layer based on the measured reflectivity value.