Dopant-Free Crossconjugated Hole-Transporting Polymers for Highly Efficient Perovskite Solar Cells.,Advanced Science

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Dopant-Free Crossconjugated Hole-Transporting Polymers for Highly Efficient Perovskite Solar Cells.
Advanced Science ( IF 14.3 ) Pub Date : 2020-05-28 , DOI: 10.1002/advs.201903331
Xianglang Sun ₁ , Xiang Deng _{2,

3} , Zhen Li ₂ , Bijin Xiong ₁ , Cheng Zhong ₄ , Zonglong Zhu ₂ , Zhong'an Li ₁ , Alex K-Y Jen _{2,

3}

Affiliation

Currently, there are only very few dopant‐free polymer hole‐transporting materials (HTMs) that can enable perovskite solar cells (PVSCs) to demonstrate a high power conversion efficiency (PCE) of greater than 20%. To address this need, a simple and efficient way is developed to synthesize novel crossconjugated polymers as high performance dopant‐free HTMs to endow PVSCs with a high PCE of 21.3%, which is among the highest values reported for single‐junction inverted PVSCs. More importantly, rational understanding of the reasons why two isomeric polymer HTMs (PPE1 and PPE2 ) with almost identical photophysical properties, hole‐transporting ability, and surface wettability deliver so distinctly different device performance under similar device fabrication conditions is manifested. PPE2 is found to improve the quality of perovskite films cast on top with larger grain sizes and more oriented crystallization. These results help unveil the new HTM design rules to influence the perovskite growth/crystallization for improving the performance of inverted PVSCs.

中文翻译：

用于高效钙钛矿太阳能电池的无掺杂剂交叉共轭空穴传输聚合物。

目前，能够使钙钛矿太阳能电池（PVSC）表现出大于20%的高功率转换效率（PCE）的无掺杂聚合物空穴传输材料（HTM）非常少。为了满足这一需求，开发了一种简单有效的方法来合成新型交叉共轭聚合物作为高性能无掺杂剂 HTM，使 PVSC 具有 21.3% 的高 PCE，这是单结反向 PVSC 报道的最高值之一。更重要的是，合理理解了为什么两种具有几乎相同的光物理性质、空穴传输能力和表面润湿性的异构聚合物HTM（PPE1和PPE2 ）在相似的器件制造条件下提供如此明显不同的器件性能的原因。研究发现， PPE2可以提高顶部浇铸的钙钛矿薄膜的质量，具有更大的晶粒尺寸和更多的取向结晶。这些结果有助于揭示新的 HTM 设计规则，以影响钙钛矿的生长/结晶，从而提高倒置 PVSC 的性能。

更新日期：2020-07-08

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