中国科学院长春应用化学研究所秦川江团队研究了钙钛矿光伏电池中稳定、均匀的自组装有机双自由基分子。这一研究成果发表在2025年6月26日出版的《科学》杂志上。

广泛应用于钙钛矿太阳能电池（PSC）的有机自组装分子（SAM）应表现出增强的性能，以支持钙钛矿光伏的持续发展。研究组通过供体-受体策略的共面共轭设计了二自由基SAM，以促进SAM中的空穴传输。由于分子空间位阻设计，二自由基SAM表现出高光热和电化学稳定性，以及改进的组装均匀性和大面积溶液加工性。 

采用先进的扫描电化学电池显微镜薄层循环伏安技术，研究组准确测定了SAM的载流子转移速率、稳定性和组装性能。最终，PSC的效率超过26.3%，微型模块（10.05 cm²）达到23.6%，钙钛矿硅串联器件（1 cm²）超过34.2%。在45°C下跟踪2000小时后，PSC保持在97%以上。

附：英文原文

Title: Stable and uniform self-assembled organic diradical molecules for perovskite photovoltaics

Author: Wenping Wu, Han Gao, Lingbo Jia, Yuan Li, Dezhong Zhang, Hongmei Zhan, Jianan Xu, Binhe Li, Ziran Geng, Yanxiang Cheng, Hui Tong, Yanxiong Pan, Jun Liu, Yongcai He, Xixiang Xu, Zhenguo Li, Bo He, Min Zhou, Lixiang Wang, Chuanjiang Qin

Issue&Volume: 2025-06-26

Abstract: Organic self-assembled molecules (SAMs), widely used in perovskite solar cells (PSCs), should exhibit enhanced performance to support the ongoing advancement of perovskite photovoltaics. We designed diradical SAMs through a coplanar-conjugation of donor-acceptor strategy to facilitate hole transport across the SAMs. The diradical SAMs exhibited high photothermal and electrochemical stability, as well as improved assembly uniformity and large-area solution processability attributed to molecular steric hindrance design. An advanced scanning electrochemical cell microscopy-thin-layer cyclic voltammetry technique was used to accurately determine the carrier transfer rate, stability, and assembly properties of SAMs. Ultimately, the efficiencies of PSCs exceeded 26.3%, mini-modules (10.05 cm2) reached 23.6%, and perovskite-silicon tandem devices (1 cm2) surpassed 34.2%. PSCs maintained > 97% after 2000 hours tracking at 45°C.

DOI: adv4551

Source: https://www.science.org/doi/10.1126/science.adv4551