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首页> 外文期刊>RSC Advances >A biomolecule-assisted, cost-efficient route for growing tunable CuInS2 films for green energy application
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A biomolecule-assisted, cost-efficient route for growing tunable CuInS2 films for green energy application

机译：一种生物分子辅助，具有成本效益的方法来生长可调谐CuInS 2 膜以用于绿色能源

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CuInS2 has become a popular and promising candidate as an absorber material in photovoltaic devices and photo-electrochemical cells. Here we report the successful L-cysteine-assisted growth of homogeneous, nanostructured CuInS2 thin films deposited on fluorine-doped tin oxide coated glass. In contrast to existing synthesis routes using thioacetamide as a sulfur source, our method offers the advantage of being environmentally friendly and non-toxic. We found that L-cysteine is able to reduce the Cu2+ ions of the precursor CuSO4 to Cu+ in aqueous solution, thus enabling the formation of CuInS2 thin films. By varying the concentration of the reaction solution during the solvothermal synthesis route, we obtained CuInS2 films with different thicknesses and compositions, investigated with the help of energy dispersive X-ray spectroscopy with scanning and transmission electron microscopy. X-ray and electron diffraction experiments of the films prove the synthesis of a pure CuInS2 phase with the chalcopyrite structure except for the highest L-cysteine concentration where additional In2S3 forms. UV-Vis absorption spectroscopy reveals absorption over the whole visible spectrum. The calculated band gap using the UV-Vis data ranges between 1.4 and 1.5 eV, and can be adjusted by changing crystal size and chemical composition. This offers a promising route towards tuning the optical and transport properties. First dye degradation experiments show promising activity under solar illumination.
机译：CuInS 2 已成为光伏器件和光电化学电池中吸收材料的流行和有希望的候选者。在这里，我们报告了沉积在掺氟氧化锡涂层玻璃上的均匀，纳米结构的CuInS 2 薄膜成功的 L -半胱氨酸辅助生长。与使用硫代乙酰胺作为硫源的现有合成路线相反，我们的方法具有环保且无毒的优点。我们发现 L -半胱氨酸能够还原CuSO 4 2 + 离子> 到水溶液中的Cu + ，从而可以形成CuInS 2 薄膜。通过改变溶剂热合成过程中反应溶液的浓度，我们获得了具有不同厚度和成分的CuInS 2 薄膜，并借助能量色散X射线光谱研究扫描和透射电子显微镜。薄膜的X射线和电子衍射实验证明，除了最高的 L -以外，具有黄铜矿结构的纯CuInS 2 相的合成额外的In 2 S 3 形成的半胱氨酸浓度。紫外-可见吸收光谱显示整个可见光谱的吸收。使用UV-Vis数据计算出的带隙在1.4至1.5 eV之间，并且可以通过改变晶体尺寸和化学成分进行调整。这为调整光学和传输特性提供了一条有希望的途径。最初的染料降​​解实验表明，在阳光照射下具有良好的活性。

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