Nanocrystalline zinc sulfide (ZnS) thin films are prepared on glass substrates by chemical bath deposition (CBD) method using aqueous solutions of zinc chloride, thiourea ammonium hydroxide along with non-toxic complexing agent tri-sodium citrate in alkaline medium at 80 °C. The deposition time and annealing effects on the optical and morphological properties are studied. The morphological, compositional, and optical properties of the films are investigated by scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDAX) and UV-Vis spectroscopy. SEM micrographs exhibit uniform surface coverage. UV-Vis (300 nm to 800 nm) spectrophotometric measurements show transparency of the films (transmittance ranging from 69 % to 81 %), with a direct allowed energy band gap in the range of 3.87 eV to 4.03 eV. After thermal annealing at 500 °C for 120 min, the transmittance increases up to 87 %.

中文翻译：

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沉积时间和退火对化学浴沉积ZnS薄膜的形貌和光学性质的影响

在80°C的碱性介质中，使用氯化锌，硫脲氢氧化铵和无毒络合剂柠檬酸三钠的水溶液，通过化学浴沉积（CBD）方法在玻璃基板上制备纳米晶硫化锌（ZnS）薄膜。研究了沉积时间和退火对光学和形态性能的影响。通过扫描电子显微镜（SEM），X射线能量色散光谱（EDAX）和紫外可见光谱研究了薄膜的形貌，组成和光学性质。SEM显微照片显示出均匀的表面覆盖。UV-Vis（300 nm至800 nm）分光光度法测量显示薄膜的透明度（透射率范围为69％至81％），直接允许的能带隙为3.87 eV至4.03 eV。