Jiang Xiaofen, Jia Lingbo, Zhang Shantao, Gao Yan, Yan Nan, Hou Tianao, Gao Shuang, Wang Xue, Li Xinyu, Chen Wenjing, Xiao Zhengguo, Wu Xiaojun, Fang Zhimin, Liu Shengzhong Frank, Yang Shangfeng
Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.
Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
Angew Chem Int Ed Engl. 2024 Dec 16;63(51):e202412409. doi: 10.1002/anie.202412409. Epub 2024 Oct 18.
The electron extraction from perovskite/C interface plays a crucial role in influencing the photovoltaic performance of inverted perovskite solar cells (PSCs). Here, we develop a one-stone-for-three-birds strategy via employing a novel fullerene derivative bearing triple methyl acrylate groups (denoted as C-TMA) as a multifunctional interfacial layer to optimize electron extraction at the perovskite/C interface. It is found that the C-TMA not only passivates surface defects of perovskite via coordination interactions between C=O groups and Pb cations but also bridge electron transfer between perovskite and C. Moreover, it effectively induces the secondary grain growth of the perovskite film through strong bonding effect, and this phenomenon has never been observed in prior art reports on fullerene related studies. The combination of the above three upgrades enables improved perovskite film quality with increased grain size and enhanced crystallinity. With these advantages, C-TMA treated PSC devices exhibit a much higher power conversion efficiency (PCE) of 24.89 % than the control devices (23.66 %). Besides, C-TMA benefits improved thermal stability of PSC devices, retaining over 90 % of its initial efficiency after aging at 85 °C for 1200 h, primarily due to the reinforced interfacial interactions and improved perovskite film quality.
从钙钛矿/C界面提取电子在影响倒置钙钛矿太阳能电池（PSC）的光伏性能方面起着关键作用。在此，我们开发了一种一石三鸟的策略，通过使用一种带有三个丙烯酸甲酯基团的新型富勒烯衍生物（表示为C-TMA）作为多功能界面层，以优化钙钛矿/C界面处的电子提取。研究发现，C-TMA不仅通过C=O基团与Pb阳离子之间的配位相互作用钝化钙钛矿的表面缺陷，还能桥接钙钛矿与C之间的电子转移。此外，它通过强键合效应有效地诱导钙钛矿薄膜的二次晶粒生长，而这种现象在先前关于富勒烯相关研究的现有技术报告中从未被观察到。上述三种改进措施的结合使得钙钛矿薄膜质量得到改善，晶粒尺寸增大，结晶度提高。凭借这些优势，经C-TMA处理的PSC器件表现出比对照器件（23.66%）高得多的功率转换效率（PCE），达到24.89%。此外，C-TMA有利于提高PSC器件的热稳定性，在85°C下老化1200小时后仍保持其初始效率的90%以上，这主要归因于增强的界面相互作用和改善的钙钛矿薄膜质量。
