부산대학교 도서관

The zinc sulfide (ZnS) is a growing semiconductor having tunable electrical, optical and dielectric properties. Herein, a powder vapor transport technique is employed to synthesize broccoli-based nanostructured ZnS films on glass substrates placed at different source to substrate distances (SSD). The XRD patterns reveal the development of various diffraction (111), (220), (311) planes related to ZnS phase thereby confirms the synthesis of polycrystalline ZnS films. The structural parameters like crystallinity, crystallite-size, dislocation-density, lattice-parameter and bond-length of ZnS films are affected by energy fluxes of involved species, whereas the energy fluxes are decreased with increasing SSD. The formation of chemical bonds between Zn and S is confirmed by Raman analysis. The surface morphology of synthesized ZnS films is charged from broccoli-based nanostructured to rounded nanoparticles with increasing SSD. The thickness of ZnS films is decreased with increasing SSD. The decreasing film thickness is responsible to increase the transmittance (70–90%) of ZnS films. The refractive index is decreased (2.41–1.93) while the energy band gaps (3.48–3.55 eV) of ZnS films is increased with increasing SSD. The optical conductivity of ZnS films are increased with increasing SSD. The permittivity of ZnS films showing low loss factor (0.037) is increased from 2.68 to 5.04 with increasing SSD. Results show that the synthesized ZnS films having aforementioned properties may be used for optoelectronics applications like solar cells and capacitors. [ABSTRACT FROM AUTHOR]