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Influence of the cathode microstructure on the stability of inverted planar perovskite solar cells

机译：阴极微观结构对倒置平面钙钛矿太阳能电池稳定性的影响

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摘要

One of the main challenges for perovskite solar cells (PSC) is their environmental stability, as oxygen and water induced aging may result in mobile decomposition compounds, which can enhance the recombination rate and react with charge carrier extraction layers or the contact metallization. In this contribution the importance of the microstructure of the contact metallization on the environmental cell stability is investigated. For this purpose, the storage stability of inverted planar methylammonium lead iodide (MAPI)-based perovskite solar cells without encapsulation is tested, using the metals aluminum (Al), silver (Ag), gold (Au) and nickel (Ni) as representative cathode materials. For this study, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) analysis of the different electrodes as well as the perovskite is correlated with PSC device current-voltage (J-V) and impedance measurements. Our findings substantiate that the metal microstructure has a significant influence on the PSC aging properties. While a strong perovskite decomposition and iodide diffusion to the contacts were detected for devices using Al, Ag or Au cathodes with a polycrystalline microstructure, these effects were strongly reduced when Ni metallization was employed, where a nanocrystalline microstructure was exhibited under the chosen process conditions.
机译：Perovskite太阳能电池（PSC）的主要挑战之一是它们的环境稳定性，因为氧气和水诱导的老化可能导致移动分解化合物，其可以提高重组率并与电荷载体提取层或接触金属反应。在这一贡献中，研究了接触金属化微观结构对环境细胞稳定性的重要性。为此目的，使用金属铝（Al），银（Ag），金（Au）和镍（Ni）作为代表，测试倒置平面甲基铅碘化物（MAPI）的钙铝铅碘化物（MAPI）的钙钛矿太阳能电池的储存稳定性。作为代表阴极材料。对于该研究，扫描电子显微镜（SEM）和能量 - 分散X射线光谱（EDX）分析与PEROVSKITE与PSC器件电流 - 电压（J-V）和阻抗测量相关。我们的研究结果证实，金属微观结构对PSC老化性能有显着影响。虽然使用Al，Ag或Au阴极对具有多晶微观结构的装置检测到对触点的强烈钙钛矿分解和碘化物扩散，但是当使用Ni金属化时，这些效果受到强烈缩短，其中在所选择的工艺条件下表现出纳米晶微观结构。

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  • 来源
    《RSC Advances》 |2020年第40期|共9页
  • 作者

    Sirotinskaya Svetlana; Schmechel Roland; Benson Niels;

  • 作者单位

    Univ Duisburg Essen Fac Engn Inst Technol Nanostruct NST Bldg BA Bismarckstr 81 D-47057 Duisburg Germany;

    Univ Duisburg Essen Fac Engn Inst Technol Nanostruct NST Bldg BA Bismarckstr 81 D-47057 Duisburg Germany;

    Univ Duisburg Essen Fac Engn Inst Technol Nanostruct NST Bldg BA Bismarckstr 81 D-47057 Duisburg Germany;

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  • 正文语种 eng
  • 中图分类 化学;
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