Structural and Optical Properties of ZnS Thin Films Prepared by SprayPyrolysis Technique

Abstract

Zinc Sulfide (ZnS) is important II-VI semiconductors material for the development of various
modern technologies and photovoltaic applications. ZnS thin film was prepared by using chemical
spray pyrolysis technique. The spray solutions contains ZnCl2 and SC(NH2)2 with molar
concentration 0.1M/L. ZnS thin films was growth onto hot glass substrates at substrates temperature
400оC.
The Structure of the prepared film was studied from X-ray diffraction pattern, the results shows
that the film was polycrystalline with hexagonal structure, the grain size of ZnS film was calculated,
it was 139 Å at the high peak.
The optical properties of the film were studied using measurement from UV–VIS
spectrophotometer; the results appear that a good optical transparency of about 65 % was observed
in the visible region. The optical constants were studied as a function of the photon energy within
the wavelength in the range (300-900) nm. The refractive index was calculated in the visible region,
it was 2.45 at 500 nm. The optical band gaps for the direct and indirect transition were estimate too
and it was 3.2 – 3.1 eV respectively.