Optical Properties of Nanocrystalline ZnS Thin Films prepared by Chemical Solution Deposition

Zinc sulfide (ZnS) is a wide band gap and direct transition semiconductor. Consequently, it is a potentially important material to be used as an antireflection coating for heterojunction solar cells [1]. In particular, ZnS is believed to be one of the most promising materials for blue light emitting laser diodes and thin film electroluminescent displays [2]. In this work nanocrystalline ZnS thin films prepared by a new chemical solution deposition route [3, 4]. These thin films have been studied as an antireflection coating which is an important part of the solar cell. The parameters studied include the absorbance/ transmittance/ reflectance spectra, energy band gap, absorption coefficient, refractive index, extinction coefficient, and thickness