High Electron Affinity Enables Fast Hole Extraction for Efficient Flexible Inverted Perovskite Solar Cells,Advanced Energy Materials

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High Electron Affinity Enables Fast Hole Extraction for Efficient Flexible Inverted Perovskite Solar Cells
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-01-30 , DOI: 10.1002/aenm.201903487
Pengbin Ru ₁ , Enbing Bi _{1,

2} , Yao Zhang ₁ , Yanbo Wang ₁ , Weiyu Kong ₁ , Yongming Sha ₁ , Wentao Tang ₁ , Peng Zhang _{1,

3} , Yongzhen Wu ₄ , Wei Chen ₅ , Xudong Yang _{1,

3} , Han Chen _{1,

3} , Liyuan Han _{1,

3}

Affiliation

Inverted perovskite solar cells (PSCs) with low‐temperature processed hole transporting materials (HTMs) suffer from poor performance due to the inferior hole‐extraction capability at the HTM/perovskite interfaces. Here, molecules with controlled electron affinity enable a HTM with conductivity improved by more than ten times and a decreased energy gap between the Fermi level and the valence band from 0.60 to 0.24 eV, leading to the enhancement of hole‐extraction capacity by five times. As a result, the 3,6‐difluoro‐2,5,7,7,8,8‐hexacyanoquinodimethane molecules are used for the first time enhancing open‐circuit voltage (V_oc) and fill factor (FF) of the PSCs, which enable rigid‐and flexible‐based inverted perovskite devices achieving highest power conversion efficiencies of 22.13% and 20.01%, respectively. This new method significantly enhances the V_oc and FF of the PSCs, which can be widely combined with HTMs based on not only NiO_x but also PTAA, PEDOTT:PSS, and CuSCN, providing a new way of realizing efficient inverted PSCs.

中文翻译：

高电子亲和力可实现高效柔性倒钙钛矿太阳能电池的快速空穴提取

由于HTM /钙钛矿界面处的空穴提取能力较弱，具有低温处理的空穴传输材料（HTM）的倒钙钛矿太阳能电池（PSC）的性能较差。在这里，具有可控电子亲和力的分子可以使电导率提高10倍以上的HTM，并使费米能级与价带之间的能隙从0.60降低至0.24 eV，从而使空穴提取能力提高了五倍。结果，3,6-二氟-2-5,7,7,8,8-六氰基喹二甲烷分子首次用于增强开路电压（V _oc）和PSC的填充因子（FF），这使得基于刚性和柔性的倒钙钛矿设备能够分别实现22.13％和20.01％的最高功率转换效率。这种新方法显着增强了PSC的V _oc和FF，不仅可以与基于NiO _x而且还可以基于PTAA，PEDOTT：PSS和CuSCN的HTM广泛结合，从而提供了一种实现高效反向PSC的新方法。

更新日期：2020-03-27

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