[1] Swanepoel R. Determination of the thickness and optical constants of amorphous silicon. J. Phys. E: Sci. Instrum., 1983, 16(12):1214~1222
[3] Macleod H A. Multiple determination of the optical constants of thin-film coating materials. Appl. Opt., 1984, 23(20):3571~3596
[4] Tauc JC.Optical properties of Soilds.Amsterdam:North Holland,1972.372