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首页> 外文期刊>Advanced Functional Materials >Suppressing Ion Migration across Perovskite Grain Boundaries by Polymer Additives
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Suppressing Ion Migration across Perovskite Grain Boundaries by Polymer Additives

机译：通过聚合物添加剂抑制穿过钙钛矿晶粒边界的离子迁移

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摘要

Passivation of organometal halide perovskites with polar molecules has been recently demonstrated to improve the photovoltaic device efficiency and stability. However, the mechanism is still elusive. Here, it is found that both polymers with large and small dipole moment of 3.7 D and 0.6 D have negligible defect passivation effect on the MAPbI(3)perovskite films as evidenced by photothermal deflection spectroscopy. The photovoltaic devices with and without the polymer additives also have comparable power conversion efficiencies around 19%. However, devices with the additives have noticeable improvement in stability under continuous light irradiation. It is found that although the initial mobile ion concentrations are comparable in both devices with and without the additives, the additives can strongly suppress the ion migration during the device operation. This contributes to the significantly enhanced electrical-field stress tolerance of the perovskite solar cells (PVSCs). The PVSCs with polymer additives can operate up to -2 V reverse voltage bias which is much larger than the breakdown voltage of -0.5 V that has been commonly observed. This study provides insight into the role of additives in perovskites and the corresponding device degradation mechanism.
机译：最近已经证明了具有极性分子的有机卤素钙酸盐的钝化，以提高光伏器件效率和稳定性。但是，该机制仍然难以捉摸。这里，发现具有大小偶极矩的两种聚合物和0.6d的两种聚合物对MAPBI（3）钙钛矿膜具有可忽略的缺陷钝化效果，如光热偏转光谱所证明的。具有和不具有聚合物添加剂的光伏器件也具有约19％的可比性转化效率。然而，具有添加剂的装置在连续光照射下具有明显的稳定性改善。结果发现，尽管在两种具有添加剂的装置中初始移动离子浓度相当，但添加剂可以在装置操作期间强制抑制离子迁移。这有助于钙钛矿太阳能电池（PVSC）的显着增强的电场应力耐受性。具有聚合物添加剂的PVSC可以操作高达-2V反向电压偏压，该偏压远大于通常观察到的-0.5V的击穿电压。本研究介绍了添加剂在Perovskites和相应的设备劣化机制中的作用。

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  • 来源
    《Advanced Functional Materials》 |2021年第3期|2006802.1-2006802.9|共9页
  • 作者

    Ma Yuhui; Cheng Yuanhang; Xu Xiuwen; Li Menglin; Zhang Chujun; Cheung Sin Hang; Zeng Zixin; Shen Dong; Xie Yue-Min; Chiu Ka Lok; Lin Fen; So Shu Kong; Lee Chun-Sing; Tsang Sai-Wing;

  • 作者单位

    City Univ Hong Kong Ctr Super Diamond & Adv Films COSDAF Dept Mat Sci & Engn Hong Kong 999077 Peoples R China;

    Natl Univ Singapore SERIS Singapore 117574 Singapore;

    City Univ Hong Kong Ctr Super Diamond & Adv Films COSDAF Dept Mat Sci & Engn Hong Kong 999077 Peoples R China;

    City Univ Hong Kong Ctr Super Diamond & Adv Films COSDAF Dept Mat Sci & Engn Hong Kong 999077 Peoples R China;

    Hong Kong Baptist Univ Dept Phys Hong Kong 999077 Peoples R China;

    Hong Kong Baptist Univ Dept Phys Hong Kong 999077 Peoples R China;

    City Univ Hong Kong Ctr Super Diamond & Adv Films COSDAF Dept Mat Sci & Engn Hong Kong 999077 Peoples R China;

    City Univ Hong Kong Ctr Super Diamond & Adv Films COSDAF Dept Chem Hong Kong 999077 Peoples R China;

    City Univ Hong Kong Ctr Super Diamond & Adv Films COSDAF Dept Mat Sci & Engn Hong Kong 999077 Peoples R China;

    Hong Kong Baptist Univ Dept Phys Hong Kong 999077 Peoples R China;

    Natl Univ Singapore SERIS Singapore 117574 Singapore;

    Hong Kong Baptist Univ Dept Phys Hong Kong 999077 Peoples R China;

    City Univ Hong Kong Ctr Super Diamond & Adv Films COSDAF Dept Chem Hong Kong 999077 Peoples R China;

    City Univ Hong Kong Ctr Super Diamond & Adv Films COSDAF Dept Mat Sci & Engn Hong Kong 999077 Peoples R China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    grain boundaries; ion dissociation; ion migration; perovskite; polymer additives;

    机译：晶界;离子解离;离子迁移;Perovskite;聚合物添加剂;

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