Over 19.2% Efficiency of Organic Solar Cells Enabled by Precisely Tuning the Charge Transfer State Via Donor Alloy Strategy

被引：146

作者：

Gao, Jinhua ^{[1
]}

Yu, Na ^{[2
]}

Chen, Zhihao ^{[3
]}

Wei, Yanan ^{[1
]}

Li, Congqi ^{[1
]}

Liu, Tianhua ^{[1
]}

Gu, Xiaobin ^{[1
]}

Zhang, Jianqi ^{[4
]}

Wei, Zhixiang ^{[4
]}

Tang, Zheng ^{[2
]}

Hao, Xiaotao ^{[3
]}

Zhang, Fujun ^{[5
]}

Zhang, Xin ^{[1
]}

Huang, Hui ^{[1
]}

机构：

[1] Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Ctr Mat Sci & Optoelect Engn, CAS Ctr Excellence Topol Quantum Computat,CAS Key, Beijing 100049, Peoples R China

[2] Donghua Univ, Ctr Adv Low Dimens Mat, State Key Lab Modificat Chem Fibers & Polymer Mat, Coll Mat Sci & Engn, Shanghai 201620, Peoples R China

[3] Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China

[4] Natl Ctr Nanosci & Technol, Ctr Excellence Nanosci CAS, Key Lab Nanosyst & Hierarch Fabricat CAS, Beijing 100190, Peoples R China

[5] Beijing Jiaotong Univ, Minist Educ, Key Lab Luminescence & Opt Informat, Beijing 100044, Peoples R China

来源：

ADVANCED SCIENCE | 2022年 / 9卷 / 30期

基金：

中国博士后科学基金; 国家重点研发计划;

关键词：

charge transfer state; donor alloy strategy; energy loss; organic solar cells;

D O I：

10.1002/advs.202203606

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 (Delta E-CT), and promote the hybridization between localized excitation state and CT state to reduce the nonradiative energy loss (Delta 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.

引用

页数：8

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