Sun Xianglang, Deng Xiang, Li Zhen, Xiong Bijin, Zhong Cheng, Zhu Zonglong, Li Zhong'an, Jen Alex K-Y
Key Laboratory for Material Chemistry of Energy Conversion and Storage Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China.
Department of Chemistry City University of Hong Kong Kowloon 999077 Hong Kong SAR.
Adv Sci (Weinh). 2020 May 28;7(13):1903331. doi: 10.1002/advs.201903331. eCollection 2020 Jul.
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 ( and ) with almost identical photophysical properties, hole-transporting ability, and surface wettability deliver so distinctly different device performance under similar device fabrication conditions is manifested. 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.
目前，仅有极少数无掺杂聚合物空穴传输材料（HTMs）能使钙钛矿太阳能电池（PVSCs）展现出大于20%的高功率转换效率（PCE）。为满足这一需求，人们开发出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HTMs，以使PVSCs具有21.3%的高PCE，这是单结倒置PVSCs报道的最高值之一。更重要的是，合理地理解了为什么两种具有几乎相同光物理性质、空穴传输能力和表面润湿性的异构聚合物HTMs（和）在相似的器件制备条件下会表现出如此明显不同的器件性能。发现能改善浇铸在顶部的钙钛矿薄膜的质量，使其具有更大的晶粒尺寸和更取向的结晶。这些结果有助于揭示影响钙钛矿生长/结晶以提高倒置PVSCs性能的新HTM设计规则。
