Optical Properties of Al- and Sb-Doped CdTe Thin Films

摘要

Nondoped and (Al, Sb)-doped CdTe thin films with 0.5, 1.5, and 2.5 wt.%, respectively, were deposited by thermal evaporation technique under vacuum onto Corning 7059 glass at substrate temperatures (T_s) of room temperature (RT) and 423 K. The optical properties of deposited CdTe films such as band gap, refractive index (n), extinction coefficient (k_e), and dielectric coefficients were investigated as function of Al and Sb wt.% doping, respectively.The results showed that films have direct optical transition.Increasing Ts and the wt.% of both types of dopant, the band ap decrease but the optical is constant as n, k_e and real and imaginary parts of the dielectric coefficient increase.