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首页> 外文期刊>Advanced energy materials >π-Conjugated Small Molecules Modified SnO_2 Layer for Perovskite Solar Cells with over 23% Efficiency
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π-Conjugated Small Molecules Modified SnO_2 Layer for Perovskite Solar Cells with over 23% Efficiency

机译：π-缀合的小分子改性SnO_2层，用于钙钛矿太阳能电池，效率超过23％

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摘要

SnO2 has been universally applied as electron transporting layer (ETL) towards the fabrication of highly efficient perovskite solar cells (PSCs), owing to its unique advantages including low-temperature solution-processability, high optical, transmittance and good electrical conductivity. Uncoordinated Sn-dangling bonds on SnO2 surface exist as deep traps to capture the photogenerated carriers, causing hysteresis and device instability. Fullerene derivatives, though being widely utilized as the passivator for SnO2, are highly prone to self-aggregate due to their pi-cage structures, which hampers passivation. Herein, pi-conjugated n-type small molecules with better film formation ability are innovatively designed, to improve passivation effectiveness. By exploring the interplay between molecular stacking of small molecules and charge transporting/recombination dynamics at the SnO2/perovskite interface, it is unveiled that a more compact molecular packing of the organic passivators yields superior interfacial characteristics, in terms of fewer trap states, lower charge recombination and higher electron transporting efficiency. An impressive PCE over 23% is achieved with the assistance of this new-type SnO2-passivator, which is among the highest reported value for triple-cation perovskite systems to date. This work offers an original concept for the design and synthesis of ETL passivators towards the development of high performance and stable PSCs.
机译：由于其独特的优点包括低温溶液 - 加工性，高光学，透射率和良好的导电性，因此SNO2普遍应用于高效的钙钛矿太阳能电池（PSCS）的制造。 SnO2表面上的未开放的Sn-andling键存在作为深阱以捕获光生载体，导致滞后和装置不稳定性。富勒烯衍生物，尽管随着SNO2的钝化剂被广泛使用，但由于其PI-CAGE结构而高度容易发生自骨料，其妨碍了钝化。这里，具有更好的膜形成能力的Pi缀合的N型小分子是创新的设计，以提高钝化效果。通过在SnO2 / Perovskite界面进行小分子和电荷传输/重组动力学之间的分子堆叠之间的相互作用，推出了有机钝化剂的更紧凑的分子包装，从更少的陷阱状态下，更低的电荷产生卓越的界面特征重组和更高的电子传输效率。在这种新型SnO2钝化器的帮助下，令人印象深刻的PCE是超过23％的，这是迄今为止Triple-Cate Perovskite系统的最高报告值之一。这项工作为ETL钝化器的设计和综合发展提供了高性能和稳定PSC的原创概念。

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  • 来源
    《Advanced energy materials》 |2021年第39期|2101416.1-2101416.10|共10页
  • 作者

    Lou Qiang; Han Yufang; Liu Chang; Zheng Kanghui; Zhang Jinsheng; Chen Xia; Du Qing; Chen Chong; Ge Ziyi;

  • 作者单位

    Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China|Henan Univ Henan Key Lab Photovolta Mat Kaifeng 475004 Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China;

    Henan Univ Henan Key Lab Photovolta Mat Kaifeng 475004 Peoples R China;

    Henan Univ Henan Key Lab Photovolta Mat Kaifeng 475004 Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol & Engn Ningbo 315201 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    efficiency; organic-inorganic hybrid perovskites; passivation; small molecules; stability; tin oxide;

    机译：效率;有机 - 无机杂交钙质;钝化;小分子;稳定性;氧化锡;

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