Organic Solar Cells with 18% Efficiency Enabled by an Alloy Acceptor: A Two-in-One Strategy

被引:411
作者
Liu, Feng [1 ,2 ]
Zhou, Liang [3 ]
Liu, Wenrui [1 ,4 ]
Zhou, Zichun [1 ,4 ]
Yue, Qihui [1 ,4 ]
Zheng, Wenyu [1 ,4 ]
Sun, Ri [2 ]
Liu, Wuyue [4 ]
Xu, Shengjie [1 ]
Fan, Haijun [1 ]
Feng, Liheng [2 ]
Yi, Yuanping [1 ,4 ]
Zhang, Wenkai [3 ]
Zhu, Xiaozhang [1 ,4 ]
机构
[1] Chinese Acad Sci, Inst Chem, CAS Key Lab Organ Solids, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
[2] Shanxi Univ, Sch Chem & Chem Engn, Taiyuan 030006, Peoples R China
[3] Beijing Normal Univ, Ctr Adv Quantum Studies, Dept Phys & Appl Opt, Beijing Area Major Lab, Beijing 100875, Peoples R China
[4] Univ Chinese Acad Sci, Sch Chem Sci, Beijing 100049, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
acceptor alloys; energy‐ level modulation; nonfullerene acceptors; power conversion efficiency; ternary organic solar cells; NON-FULLERENE ACCEPTORS; ELECTRON-ACCEPTOR; VOLTAGE LOSSES; ENERGY-LOSS; POLYMER; PROSPECTS; DONOR;
D O I
10.1002/adma.202100830
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The trade-off between the open-circuit voltage (V-oc) and short-circuit current density (J(sc)) has become the core of current organic photovoltaic research, and realizing the minimum energy offsets that can guarantee effective charge generation is strongly desired for high-performance systems. Herein, a high-performance ternary solar cell with a power conversion efficiency of over 18% using a large-bandgap polymer donor, PM6, and a small-bandgap alloy acceptor containing two structurally similar nonfullerene acceptors (Y6 and AQx-3) is reported. This system can take full advantage of solar irradiation and forms a favorable morphology. By varying the ratio of the two acceptors, delicate regulation of the energy levels of the alloy acceptor is achieved, thereby affecting the charge dynamics in the devices. The optimal ternary device exhibits more efficient hole transfer and exciton separation than the PM6:AQx-3-based system and reduced energy loss compared with the PM6:Y6-based system, contributing to better performance. Such a "two-in-one" alloy strategy, which synergizes two highly compatible acceptors, provides a promising path for boosting the photovoltaic performance of devices.
引用
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页数:8
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