Open AccessOver 19.2% Efficiency of Organic Solar Cells Enabled by Precisely Tuning the Charge Transfer State Via Donor Alloy Strategy
Author(s) -
Gao Jinhua,
Yu Na,
Chen Zhihao,
Wei Yanan,
Li Congqi,
Liu Tianhua,
Gu Xiaobin,
Zhang Jianqi,
Wei Zhixiang,
Tang Zheng,
Hao Xiaotao,
Zhang Fujun,
Zhang Xin,
Huang Hui
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202203606
Subject(s) - ternary operation , photovoltaic system , materials science , organic solar cell , energy conversion efficiency , open circuit voltage , voltage , alloy , optoelectronics , short circuit , state of charge , ternary alloy , battery (electricity) , power (physics) , electrical engineering , computer science , composite material , physics , engineering , thermodynamics , programming language
Abstract The large energy loss ( E loss ) is one of the main obstacles to further improve the photovoltaic performance of organic solar cells (OSCs), which is closely related to the charge transfer (CT) state. Herein, ternary donor alloy strategy is used to precisely tune the energy of CT state ( E CT ) and thus the E loss for boosting the efficiency of OSCs. The elevated E CT in the ternary OSCs reduce the energy loss for charge generation (Δ E CT ), and promote the hybridization between localized excitation state and CT state to reduce the nonradiative energy loss (Δ E nonrad ). Together with the optimal morphology, the ternary OSCs afford an impressive power conversion efficiency of 19.22% with a significantly improved open‐circuit voltage ( V oc ) of 0.910 V without sacrificing short‐cicuit density ( J sc ) and fill factor (FF) in comparison to the binary ones. This contribution reveals that precisely tuning the E CT via donor alloy strategy is an efficient way to minimize E loss and improve the photovoltaic performance of OSCs.