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The Influence of Se Concentration on Optical
Properties of Thermal Evaporated
Cu2ZnSn(SexS1-x)4Thin Films

 

ABSTRACT
Thin CZT(S, Se) films were deposited onto glass substrates by thermal evaporation in vacuum 5 × 10−5 mbar. Films of thickness
750 nm were prepared at 413K. The optical properties of the films were as convinced by UV-VIS spectrophotometer (photon
wavelength ranging between 200 and 1100 nm). Influence of Se concentrations of the films on the optical properties was studied
with keeping other deposition parameters fixed. Maximum transmittance decreased with the increase of S concentration. Optical
transmittance, reflectance and thickness of the films were utilized to compute the absorption coefficient and optical band gap
energy of the films using a computerized process. The nature of the optical transition has been direct allowed with average optical
band gap energies ranging between 1.31 eV and 1.62 eV. The optical band gap energy has a tendency to increase with the increase
of the S concentration. The optical constants were investigated as a function of Se concentrations. The extent and nature of
transmittance and optimized band gap of the material ensure to utilize it for photovoltaic applications.
Keywords: Cu2ZnSn(SexS1-x)4 alloys and thin films, thermal evaporation, optical properties

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