Patent ID: 6218198
Filing Date: 2001-04-17
Classification: H01L

Abstract:
A method for evaluating a semiconductor film comprising:(a) measuring a light reflectance of the semiconductor film to be evaluated within a wavelength range;(b) determining a crystallization quality of the semiconductor film to be evaluated based on the measured light reflectance, the crystallization quality being a crystal grain size of the semiconductor film to be evaluated, and the grain size being determined based on a relationship between the light reflectance and the wavelength;(c) measuring a light reflectance of each of a plurality of semiconductor films within the wavelength range;(d) calculating an optical value for each of the plurality of semiconductor films based on the light reflectance measured in step (c);(e) measuring the grain sizes of each of the plurality of semiconductor films;(f) obtaining a relationship between the optical value and the grain size from the optical values calculated in step (d) and the grain sizes measured in step (e); and(g) calculating an optical value for the semiconductor film to be evaluated based on the light reflectance measured in step (a),wherein the step (b) includes determining the grain size of the semiconductor film to be evaluated based on optical value of the semiconductor film to be evaluated calculated in step (g) and the relationship between the optical value and the grain size obtained in step (f), and wherein the optical value is a minimum value of a first order rate of change of the light reflectance within the wavelength range.