Patent ID: 6426791
Filing Date: 2002-07-30
Classification: H01L

Abstract:
An apparatus for evaluating a semiconductor film on a substrate, comprising:an irradiator for irradiating light to the semiconductor film to be evaluated; a detector for detecting the light reflected on the semiconductor film to be evaluated; a calculator for calculating an optical value of the semiconductor film to be evaluated based on data obtained through the detector; a memory for holding optical values of a plurality of semiconductor films and crystal grain sizes of the plurality of the semiconductor films corresponding to the optical values; and an evaluator for selecting a crystal grain size corresponding to the optical value of the semiconductor film to be evaluated which is calculated by the calculator referring to the correspondence in memory and determining the selected crystal grain size as a crystal grain size of the semiconductor film to be evaluated, wherein the optical value is a minimum value of the rate of change of the reflectance of the light within the predetermined wave length area.