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Performance enhancement of flexible CZTSSe solar cells on optimized roughness substrate

机译:优化粗糙度衬底上的柔性CZTSSe太阳能电池的性能增强

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摘要

Flexible Cu_2ZnSn(S,Se)_4 (CZTSSe) thin film solar cells are fabricated on titanium substrate by magnetron sputtering with a composition gradient precursor followed by selenization. By varying polishing time with diluted HNO_3 and HF from 0 to 90 s, an atomic force microscope shows that the substrate with the minimal surface roughness of 8.6 nm is obtained with the polishing time of 60 s. X-ray diffraction and Raman spectroscopy reveal a highly crystalline structure for the prepared CZTSSe thin films. The gradual grown up grain size of CZTSSe thin film is observed with the increasing polishing time of the substrate. Compared with the CZTSSe solar cells on untreated titanium substrates, a maximum power conversion efficiency enhancement of 56% is achieved for solar cells on polished substrates, which can be attributed to the reduction of recombination at the interface and isolated defects in devices. External quantum efficiency curves show an enhancement in the visible and near-infrared region after optimizing substrate roughness. On the basis of Ti substrate with a minimum roughness, the percentage reduction of efficiency is found to exhibit the minimum value of 5% after bending for five times.
机译:柔性Cu_2ZnSn(S,Se)_4(CZTSSe)薄膜太阳能电池是通过磁控溅射,组成梯度前驱物,然后硒化在钛基板上制备的。通过将稀释的HNO_3和HF的抛光时间从0更改为90 s,原子力显微镜显示,在60 s的抛光时间下可获得最小表面粗糙度为8.6 nm的基板。 X射线衍射和拉曼光谱揭示了所制备的CZTSSe薄膜的高度结晶结构。随着基底抛光时间的增加,观察到CZTSSe薄膜的晶粒逐渐长大。与未经处理的钛基板上的CZTSSe太阳能电池相比,抛光基板上的太阳能电池的最大功率转换效率提高了56%,这可以归因于界面处的复合减少和器件中的隔离缺陷。优化基板粗糙度之后,外部量子效率曲线显示可见光和近红外区域的增强。在具有最小粗糙度的Ti基板的基础上,发现效率降低的百分比在弯曲五次后呈现出最小值的5%。

著录项

  • 来源
    《Optical engineering》 |2018年第7期|077101.1-077101.8|共8页
  • 作者单位

    Nanjing University of Aeronautics and Astronautics, College of Energy and Power Engineering, Nanjing, China,Nanjing University of Aeronautics and Astronautics, College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing, China;

    Nanjing University of Aeronautics and Astronautics, College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing, China;

    Nanjing University of Aeronautics and Astronautics, College of Energy and Power Engineering, Nanjing, China;

    Nanjing University of Aeronautics and Astronautics, College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing, China;

    Nanjing University of Aeronautics and Astronautics, College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cu_2ZnSn(S,Se)_4; titanium; substrate roughness; solar cell;

    机译:Cu_2ZnSn(S;Se)_4;钛;基材粗糙度太阳能电池;

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