Abstract: The chemical spray pyrolysis technique was used to synthesis
zinc sulfide (ZnS) thin films without annealing treatment. The
thin films were grown on a glass substrate under various Zn:S
ratios (1:1,1:2, 1:3). The spray solution was prepared by combining
zinc acetate dihydrate and thiourea as precursor materials for
Zn2þ and S2- ions, with deionized water serving as the solvent.
The results of the ZnS film on glass showed a well-characterized
thin film acquired using Zn:S of (1:1,1:2,1:3) molar ratio, nozzle to
substrate distance (NSD) of 30 cm and a substrate temperature
of 300 C. Strong peaks (111) were obtained for all samples via
X-ray diffraction analysis. The photoluminescence spectrum
showed three distinctive peaks at roughly 2.36, 2.98, and 3.6 eV
and the energy gap of the synthesized thin film was 3.66 eV. The
MSM photodetectors (PDs) made from the layers on glass substrate
showed response to UV illumination (400 nm), exhibiting a
photosensitivity of 665% at base voltage of 3 V.