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首页> 外文期刊>Chemistry: A European journal >Adverse Effects of Excess Residual PbI_2 on Photovoltaic Performance, Charge Separation, and Trap-State Properties in Mesoporous Structured Perovskite Solar Cells
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Adverse Effects of Excess Residual PbI_2 on Photovoltaic Performance, Charge Separation, and Trap-State Properties in Mesoporous Structured Perovskite Solar Cells

机译：过量残余PBI_2对介孔结构钙钛矿太阳能电池中的过度残余PBI_2对光伏性能，电荷分离和陷阱 - 状态性质的不利影响

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摘要

Organic-inorganic halide perovskite solar cells have rapidly come to prominence in the photovoltaic field. In this context, CH_3NH_3PbI_3, as the most widely adopted active layer, has been attracting great attention. Generally, in a CH_3NH_3PbI_3 layer, unreacted PbI_2 inevitably coexists with the perovskite crystals, especially following a two-step fabrication process. There appears to be a consensus that an appropriate amount of unreacted PbI_2 is beneficial to the overall photovoltaic performance of a device, the only disadvantageous aspect of excess residual PbI_2 being viewed as its insulating nature. However, the further development of such perovskite-based devices requires a deeper understanding of the role of residual PbI_2. In this work, PbI_2-enriched and PbI_2-controlled perovskite films, as two extreme cases, have been prepared by modulating the crystallinity of a pre-deposited PbI_2 film. The effects of excess residual PbI_2 have been elucidated on the basis of spectroscopic and optoelectronic studies. The initial charge separation, the trap-state density, and the trap-state distribution have all been found to be adversely affected in PbI_2-enriched devices, to the detriment of photovoltaic performance. This leads to a biphasic recombination process and accelerates the charge carrier recombination dynamics.
机译：有机 - 无机卤化物钙钛矿太阳能电池迅速突出到光伏田地。在这种情况下，作为最广泛采用的活动层的CH_3NH_3PBI_3一直吸引了极大的关注。通常，在CH_3NH_3PBI_3层中，未经反应的PBI_2不可避免地与钙钛矿晶体共存，特别是在两步制造过程之后。似乎有一种共识，即适当数量的未反应的PBI_2有利于装置的整体光伏性能，过量残余PBI_2被视为其绝缘性的唯一不利的方面。然而，基于钙钠的设备的进一步发展需要更深入地了解残留PBI_2的作用。在这项工作中，通过调节预沉积的PBI_2薄膜的结晶度来制备PBI_2富集的和PBI_2控制的钙钛矿薄膜作为两个极端情况。在光谱和光电学研究的基础上阐明了过量的残留PBI_2的影响。初始电荷分离，陷阱状态密度和陷阱 - 状态分布已被发现在PBI_2富集的设备中受到不利影响，以损害光伏性能。这导致双相复合过程并加速电荷载体重组动力学。

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  • 来源
    《Chemistry: A European journal》 |2017年第16期|共7页
  • 作者

    Hao-Yi Wang; Ming-Yang Hao; Jun Han; Man Yu; Yujun Qin; Pu Zhang; Zhi-Xin Guo; Xi-Cheng Ai; Jian-Ping Zhang;

  • 作者单位

    Department of Chemistry Renmin University of China Beijing 100872 (P.R. China);

    Department of Chemistry Renmin University of China Beijing 100872 (P.R. China);

    Department of Chemistry Renmin University of China Beijing 100872 (P.R. China);

    Department of Chemistry Renmin University of China Beijing 100872 (P.R. China);

    Department of Chemistry Renmin University of China Beijing 100872 (P.R. China);

    Department of Chemistry Renmin University of China Beijing 100872 (P.R. China);

    Department of Chemistry Renmin University of China Beijing 100872 (P.R. China);

    Department of Chemistry Renmin University of China Beijing 100872 (P.R. China);

    Department of Chemistry Renmin University of China Beijing 100872 (P.R. China);

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用化学;
  • 关键词

    dynamics; excess PbI_2; fluorescence; organic- inorganic hybrid composites; perovskites;

    机译：动态;过量的PBI_2;荧光;有机无机杂交复合材料;佩洛夫斯基斯;

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