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

• 成果类型: Article
• 署名作者: Wu, Wenping; Gao, Han; Jia, Lingbo; Li, Yuan; Zhang, Dezhong; Zhan, Hongmei; Xu, Jianan; Li, Binhe; Geng, Ziran; Cheng, Yanxiang; Tong, Hui; Pan, Yanxiong; Liu, Jun; He, Yongcai; Xu, Xixiang; Li, Zhenguo; He, Bo; Zhou, Min; Wang, Lixiang; Qin, Chuanjiang
• 署名单位: Chinese Academy of Sciences; Changchun Institute of Applied Chemistry, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; Changchun Institute of Applied Chemistry, CAS; South China University of Technology
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9726
• DOI: 10.1126/science.adv4551
• 发表日期: 2025-07-10
• 页码: 195-199
• 关键词: cyclic voltammetry; solar-cells; efficient; DYNAMICS; DESIGN

摘要

Organic self-assembled molecules (SAMs), which are 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 a 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. We used an advanced scanning electrochemical cell microscopy-thin-layer cyclic voltammetry technique to accurately determine the carrier transfer rate, stability, and assembly properties of the SAMs. Ultimately, the efficiencies of the PSCs exceeded 26.3%, minimodules (10.05 cm(2)) reached 23.6%, and perovskite-silicon tandem devices (1 cm(2)) surpassed 34.2%. The PSCs maintained >97% after 2000 hours tracking at 45 degrees C.