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首页> 外文期刊>Optical Materials >Synthesis and optical characterization of n-ZnO and p-Cu2ZnSnS4 nanocrystalline thin films for low cost solar cells
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Synthesis and optical characterization of n-ZnO and p-Cu2ZnSnS4 nanocrystalline thin films for low cost solar cells

机译：低成本太阳能电池用n-ZnO和p-Cu2ZnSnS4纳米晶薄膜的合成及光学表征

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High quality ZnO/Cu2ZnSnS4 thin films as a window/absorber layers were successfully synthesized via spin coating the sol-gel precursor of each composition without using any vacuum facilities. In this study, the impact of annealing temperature (400 degrees C, 3 h) on the ZnO window layer and different thickness (3 and 5 layers) of the Cu2ZnSnS4 (CZTS) absorber layer were investigated. X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscope (SEM) and UV-vis-NIR spectroscopy were used for the structural, compositional, morphological and optical absorption analysis of each layer. ZnO exhibits wurtzite hexagonal crystal structure with particle size equals to 8.60 and 28.59 nm for fresh and annealed films, respectively. Micro-strain and dislocations density decreased with the annealing temperature. X-ray, diffraction patterns for CZTS films show small peak at (112) according to the kesterite structure with particle size in nano-scale for the two thicknesses. ZnO films demonstrated direct optical band gap of 3.23 and 3.21 eV for fresh and annealed films, respectively. CZTS films (3 and 5 layers) also have direct optical band with optimum value (1.51 eV) for thickness of 5 layers. The J-V characteristics of the CZTS-based thin film solar cells (CZTS/ZnO/ZnO:Ag) were measured under air mass AM 1.5 and 100 mW/cm(2) illumination. The values of the short circuit current (J(sc)), open circuit voltage (V-oc) and fill factor (FF) also have been obtained. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过旋涂每种组合物的溶胶-凝胶前体而不使用任何真空设备，成功地合成了高质量的ZnO / Cu2ZnSnS4窗口/吸收层薄膜。在这项研究中，研究了退火温度（400摄氏度，3小时）对ZnO窗口层和不同厚度（3层和5层）的Cu2ZnSnS4（CZTS）吸收层的影响。 X射线衍射（XRD），能量色散X射线光谱（EDX），扫描电子显微镜（SEM）和UV-vis-NIR光谱用于每层的结构，组成，形态和光学吸收分析。 ZnO表现出纤锌矿六方晶体结构，对于新鲜和退火薄膜，其粒径分别等于8.60 nm和28.59 nm。微应变和位错密度随退火温度而降低。 CZTS薄膜的X射线衍射图谱显示，根据Kesterite结构，在（112）处有一个小峰，对于这两个厚度，其粒度均为纳米级。 ZnO薄膜对新鲜和退火薄膜的直接光学带隙分别为3.23和3.21 eV。 CZTS膜（3层和5层）也具有直接光学带，对于5层的厚度，其最佳值为（1.51 eV）。在空气质量AM 1.5和100 mW / cm（2）的光照下测量了基于CZTS的薄膜太阳能电池（CZTS / ZnO / ZnO：Ag）的J-V特性。还获得了短路电流（J（sc）），开路电压（V-oc）和填充系数（FF）的值。 （C）2016 Elsevier B.V.保留所有权利。

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