Zhu Helong, Xu Zigeng, Zhang Zhiyang, Lian Shuang, Wu Yanjie, Zhang Dezhong, Zhan Hongmei, Wang Lixiang, Han Liyuan, Qin Chuanjiang
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, 130022, China.
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, China.
Adv Mater. 2024 Aug;36(33):e2406872. doi: 10.1002/adma.202406872. Epub 2024 Jun 17.
Self-assembled monolayers (SAMs) as the hole-selective contact have achieved remarkable success in iodine-based perovskite solar cells (PSCs), while their impact on bromine-based PSCs is limited due to the poor perovskite crystallization behavior and mismatched energy level alignment. Here, a highly efficient SAM of (2-(3,6-diiodo-9H-carbazol-9-yl)ethyl)phosphonic acid (I-2PACz) is employed to address these challenges in FAPbBr-based PSCs. The incorporation of I atoms into I-2PACz not only releases tensile stress within FAPbBr perovskite, promoting oriented crystallization and minimizing defects through halogen-halogen bond, but also optimizes the energy levels alignment at hole-selective interface for enhanced hole extraction. Ultimately, a power conversion efficiency (PCE) of 11.14% is achieved, which stands among the highest reported value for FAPbBr PSCs. Furthermore, the semitransparent devices/modules exhibit impressive PCEs of 8.19% and 6.23% with average visible transmittance of 41.98% and 38.99%. Remarkably, after operating at maximum power point for 1000 h, the encapsulated device maintains 93% of its initial PCE. These results demonstrate an effective strategy for achieving high-performance bromine-based PSCs toward further applications.
自组装单分子层（SAMs）作为空穴选择性接触层，在碘基钙钛矿太阳能电池（PSC）中取得了显著成功，然而由于钙钛矿结晶行为不佳以及能级匹配不当，它们对溴基PSC的影响有限。在此，采用一种高效的（2-(3,6-二碘-9H-咔唑-9-基)乙基）膦酸（I-2PACz）自组装单分子层来应对基于FAPbBr的PSC中的这些挑战。将碘原子引入I-2PACz不仅释放了FAPbBr钙钛矿内部的拉伸应力，通过卤-卤键促进了取向结晶并使缺陷最小化，还优化了空穴选择性界面处的能级匹配以增强空穴提取。最终，实现了11.14%的功率转换效率（PCE），这在已报道的FAPbBr PSC的最高值之列。此外，半透明器件/模块分别展现出8.19%和6.23%的令人印象深刻的PCE，平均可见光透过率分别为41.98%和38.99%。值得注意的是，在最大功率点运行1000小时后，封装器件保持其初始PCE的93%。这些结果证明了一种实现高性能溴基PSC以进一步应用的有效策略。
