Single-layered organic photovoltaics with double cascading charge transport pathways: 18% efficiencies

Ming Zhang, Lei Zhu, Guanqing Zhou, Tianyu Hao, Chaoqun Qiu, Zhe Zhao, Qin Hu, Bryon W. Larson, Haiming Zhu, Zaifei Ma, Zheng Tang, Wei Feng, Yongming Zhang, Thomas P. Russell and Feng Liu ()
Additional contact information
Ming Zhang: Shanghai Jiao Tong University
Lei Zhu: Shanghai Jiao Tong University
Guanqing Zhou: Shanghai Jiao Tong University
Tianyu Hao: Shanghai Jiao Tong University
Chaoqun Qiu: Shanghai Jiao Tong University
Zhe Zhao: Shanghai Jiao Tong University
Qin Hu: University of Massachusetts
Bryon W. Larson: National Renewable Energy Laboratory
Haiming Zhu: Zhejiang University
Zaifei Ma: Donghua University
Zheng Tang: Donghua University
Wei Feng: State Key Laboratory of Fluorinated Functional Membrane Materials and Dongyue Future Hydrogen Energy Materials Company
Yongming Zhang: Shanghai Jiao Tong University
Thomas P. Russell: University of Massachusetts
Feng Liu: Shanghai Jiao Tong University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract The chemical structure of donors and acceptors limit the power conversion efficiencies achievable with active layers of binary donor-acceptor mixtures. Here, using quaternary blends, double cascading energy level alignment in bulk heterojunction organic photovoltaic active layers are realized, enabling efficient carrier splitting and transport. Numerous avenues to optimize light absorption, carrier transport, and charge-transfer state energy levels are opened by the chemical constitution of the components. Record-breaking PCEs of 18.07% are achieved where, by electronic structure and morphology optimization, simultaneous improvements of the open-circuit voltage, short-circuit current and fill factor occur. The donor and acceptor chemical structures afford control over electronic structure and charge-transfer state energy levels, enabling manipulation of hole-transfer rates, carrier transport, and non-radiative recombination losses.

Date: 2021
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DOI: 10.1038/s41467-020-20580-8

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