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首页> 外文期刊>Advanced Functional Materials >Defect Passivation in Perovskite Solar Cells by Cyano-Based π-Conjugated Molecules for Improved Performance and Stability
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Defect Passivation in Perovskite Solar Cells by Cyano-Based π-Conjugated Molecules for Improved Performance and Stability

机译：基于氰基π-共轭分子的Perovskite太阳能电池缺陷钝化，以提高性能和稳定性

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摘要

Defects at the surface and grain boundaries of metal-halide perovskite films lead to performance losses of perovskite solar cells (PSCs). Here, organic cyano-based pi-conjugated molecules composed of indacenodithieno[3,2-b]thiophene (IDTT) are reported and it is found that their cyano group can effectively passivate such defects. To achieve a homogeneous distribution, these molecules are dissolved in the antisolvent, used to initiate the perovskite crystallization. It is found that these molecules are self-anchored at the grain boundaries due to their strong binding to undercoordinated Pb2+. On a device level, this passivation scheme enhances the charge separation and transport at the grain boundaries due to the well-matched energetic levels between the passivant and the perovskite. Consequently, these benefits contribute directly to the achievement of power conversion efficiencies as high as 21.2%, as well as the improved environmental and thermal stability of the PSCs. The surface treatment provides a new strategy to simultaneously passivate defects and enhance charge extraction/transport at the device interface by manipulating the anchoring groups of the molecules.
机译：金属卤化物钙钛矿薄膜表面和晶界的缺陷导致Perovskite太阳能电池（PSC）的性能损失。这里，报告了由茚磺奈替苯并噻吩（IDTT）组成的基于氰基的PI缀合分子，并发现其氰基可以有效地钝化这些缺陷。为了实现均匀的分布，这些分子溶解在防溶剂中，用于引发钙钛矿结晶。发现这些分子由于其与底备PB2 +的强粘附而自动锚定。在设备水平上，由于钝化剂和钙钛矿之间的良好匹配的能量水平，这种钝化方案增强了晶界的电荷分离和运输。因此，这些益处直接促进了高达21.2％的功率转化效率，以及PSC的改善的环境和热稳定性。表面处理提供了一种新的策略，以通过操纵分子的锚定组在装置界面中同时钝化缺陷和增强电荷提取/传输。

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  • 来源
    《Advanced Functional Materials》 |2020年第35期|2002861.1-2002861.10|共10页
  • 作者

    Wang Kai; Liu Jiang; Yin Jun; Aydin Erkan; Harrison George T.; Liu Wenzhu; Chen Shanyong; Mohammed Omar F.; De Wolf Stefaan;

  • 作者单位

    King Abdullah Univ Sci & Technol KAUST KAUST Solar Ctr KSC Phys Sci & Engn Div PSE Thuwal 239556900 Saudi Arabia;

    King Abdullah Univ Sci & Technol KAUST KAUST Solar Ctr KSC Phys Sci & Engn Div PSE Thuwal 239556900 Saudi Arabia;

    King Abdullah Univ Sci & Technol KAUST Div Phys Sci & Engn Thuwal 239556900 Saudi Arabia;

    King Abdullah Univ Sci & Technol KAUST KAUST Solar Ctr KSC Phys Sci & Engn Div PSE Thuwal 239556900 Saudi Arabia;

    King Abdullah Univ Sci & Technol KAUST KAUST Solar Ctr KSC Phys Sci & Engn Div PSE Thuwal 239556900 Saudi Arabia;

    King Abdullah Univ Sci & Technol KAUST KAUST Solar Ctr KSC Phys Sci & Engn Div PSE Thuwal 239556900 Saudi Arabia;

    Chongqing Univ Arts & Sci Res Inst New Mat Technol Yongchuan 402160 Peoples R China;

    King Abdullah Univ Sci & Technol KAUST Div Phys Sci & Engn Thuwal 239556900 Saudi Arabia;

    King Abdullah Univ Sci & Technol KAUST KAUST Solar Ctr KSC Phys Sci & Engn Div PSE Thuwal 239556900 Saudi Arabia;

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  • 正文语种 eng
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  • 关键词

    conjugated molecules; defect passivation; increased stability; perovskite solar cells;

    机译：共轭分子;缺陷钝化;稳定性增加;钙钛矿太阳能电池;

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