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首页> 外文期刊>Advanced Functional Materials >Stability of Perovskite Thin Films under Working Condition: Bias-Dependent Degradation and Grain Boundary Effects
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Stability of Perovskite Thin Films under Working Condition: Bias-Dependent Degradation and Grain Boundary Effects

机译：工作条件下钙钛矿薄膜的稳定性：偏见依赖性降解和晶界效应

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摘要

Witnessed by the rapid increase of power conversion efficiency to 25.5%, organic-inorganic hybrid perovskite solar cells (PSCs) are becoming promising candidates of next-generation photovoltaics. However, PSCs can be unstable under the influence of light and bias. Especially, grain boundaries (GBs) are vulnerable to attack by light and bias in perovskite films, leading to degradation of photovoltaic properties of PSCs. Herein, photocurrent atomic force microscopy and Kelvin probe force microscopy are employed to systematically investigate the bias-dependent charge transport behaviors and stability of (FAPbI(3))(0.85)(MAPbBr(3))(0.15) perovskite under working condition. Bias-dependent morphology and photocurrent images show irreversible decomposition of the perovskite at a bias of 0.1 V or below, which is accelerated by light illumination, leading to formation of an interfacial layer that restricts carrier transport. Meanwhile, GBs appear to enhance carrier transport at larger bias, but serve as breakthrough sites for perovskite decomposition at smaller bias. Introducing excess methylammonium iodide promotes decomposition, while potassium iodide passivation greatly relieves the decomposition. These results support the ion migration mechanism of decomposition through interfaces and GBs. This work provides a deeper understanding of bias-induced degradation of PSCs as well as bias-dependent double-edged roles of GBs, and forms valuable guidance for appropriate operation of PSCs.
机译：随着功率转换效率的快速增长至25.5％，有机无机杂交钙钛矿太阳能电池（PSC）正成为下一代光伏的候选者。然而，PSC在光线和偏压的影响下可能是不稳定的。特别是，晶界（GBS）容易受到钙钛矿薄膜中的光和偏压的攻击，从而降解PSC的光伏性能。在此，使用光电流原子力显微镜和开菜探针显微镜，以系统地研究（FAPBI（3））（0.85）（MAPBBR（3））（0.15）钙钛矿的偏置电荷传输行为和稳定性。偏见的形态和光电流图像显示在0.1V或更低的偏差下的钙钛矿的不可逆分解，其通过光照射加速，导致形成限制载流子的界面层。同时，GBS似乎在较大的偏差下增强载波运输，但用作较小偏差下佩洛斯克钛矿分解的突破性位点。引入过量的甲基碘化物促进分解，而碘化钾钝化大大缓解了分解。这些结果支持通过界面和GBS分解的离子迁移机制。这项工作提供了更深入了解PSC的偏见致偏见，以及GBS的偏见依赖性双刃作用，并形成PSC的适当操作的宝贵指导。

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  • 来源
    《Advanced Functional Materials》 |2021年第36期|2103894.1-2103894.9|共9页
  • 作者

    Hui Yong; Tan Yan-Yan; Chen Liang; Nan Zi-Ang; Zhou Jian-Zhang; Yan Jia-Wei; Mao Bing-Wei;

  • 作者单位

    Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China|Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat Dept Chem Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China|Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat Dept Chem Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China|Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat Dept Chem Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China|Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat Dept Chem Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China|Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat Dept Chem Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China|Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat Dept Chem Xiamen 361005 Peoples R China;

    Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China|Xiamen Univ Coll Chem & Chem Engn Collaborat Innovat Ctr Chem Energy Mat Dept Chem Xiamen 361005 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    bias-dependent degradation; grain boundaries; perovskite solar cells; photocurrent atomic force microscopy; stability; working conditions;

    机译：偏见依赖性降解;晶界;钙钛矿太阳能电池;光电流原子力显微镜;稳定性;工作条件;

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