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

Wenping Wu(University of Science and Technology of China), Han Gao(Chinese Academy of Sciences), Lingbo Jia(Green Technology), Yuan Li(South China University of Technology), Dezhong Zhang(Chinese Academy of Sciences), Hongmei Zhan(Chinese Academy of Sciences), Jianan Xu(Chinese Academy of Sciences), Binhe Li(Chinese Academy of Sciences), Ziran Geng(Chinese Academy of Sciences), Yanxiang Cheng(Chinese Academy of Sciences), Hui Tong(Chinese Academy of Sciences), Yanxiong Pan(Chinese Academy of Sciences), Jun Liu(Chinese Academy of Sciences), Y.H. He(Green Technology), Xixiang Xu(Green Technology), Zhenguo Li(Green Technology), Bo He(Green Technology), Min Zhou(Chinese Academy of Sciences), Lixiang Wang(Chinese Academy of Sciences), Chuanjiang Qin(University of Science and Technology of China)
Science
June 26, 2025
10.1126/science.adv4551
Cited by 108

Abstract

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°C.

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