Abstract Determination of optimal annealing condition has important implications in fabricating optimized and efficient absorber copper zinc tin sulfide thin films. In this work, the kesterite copper zinc tin sulfide thin films were sol-gel spin-coated and were annealed at various temperatures ranging from 350 °C to 550 °C in a nitrogen atmosphere for 1 hr. The optimal annealing temperature of the pure kesterite phase is found to be 470 °C, where the films have a good morphology surface without any cracks, nearly stoichiometric, large grain size 63 nm, high optical absorption coefficient 104 cm−1 and ideal energy band gap 1.5 eV.

中文翻译：

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无硫化步骤形成旋涂铜锌锡硫化物薄膜的退火温度优化

摘要 最佳退火条件的确定对于制备优化高效的吸收体铜锌锡硫化物薄膜具有重要意义。在这项工作中，黄铜矿铜锌锡硫化物薄膜被溶胶凝胶旋涂，并在 350°C 至 550°C 的各种温度下在氮气气氛中退火 1 小时。发现纯锌黄铜矿相的最佳退火温度为 470 °C，该薄膜具有良好的形貌表面，没有任何裂纹，接近化学计量比，大晶粒尺寸 63 nm，高光吸收系数 104 cm-1 和理想的能带间隙 1.5 eV。