Compromising Charge Generation and Recombination with Asymmetric Molecule for High-Performance Binary Organic Photovoltaics with Over 18% Certified Efficiency

He, Chengliang; Bi, Zhaozhao; Chen, Zeng; Guo, Jing; Xia, Xinxin; Lu, Xinhui; Min, Jie; Zhu, Haiming; Ma, Wei; Zuo, Lijian; Chen, Hongzheng

doi:10.1002/adfm.202112511

Title: Compromising Charge Generation and Recombination with Asymmetric Molecule for High-Performance Binary Organic Photovoltaics with Over 18% Certified Efficiency

Journal Article · 21 January 2022 · Advanced Functional Materials

DOI: https://doi.org/10.1002/adfm.202112511 · OSTI ID:1981344

He, Chengliang ^[1]; Bi, Zhaozhao ^[2]; Chen, Zeng ^[1]; Guo, Jing ^[3]; Xia, Xinxin ^[4]; Lu, Xinhui ^[4]; Min, Jie ^[3]; Zhu, Haiming ^[1]; Ma, Wei ^[2]; Zuo, Lijian ^[5];

^[1]

Zhejiang Univ., Hangzhou (China)
Xi'an Jiaotong Univ. (China)
Wuhan Univ. (China)
The Chinese University of Hong Kong (Hong Kong)
Zhejiang Univ., Hangzhou (China); Zhejiang University-Hangzhou Global Scientific and Technological Innovation Center (China)

Balancing the charge generation and recombination constitutes a major challenge to break the current limit of organic photovoltaics (OPVs). Here, to address this issue, an asymmetric non-fullerene acceptor, namely the AC9, is developed and high-performance OPV with a champion efficiency of 18.43% (18.1% certified) is demonstrated. This represents the record value among binary OPVs. Comprehensive analysis on exciton dissociation, charge collection, carrier transport, and recombination has been carried out, unveiling that the improved device performance of asymmetric AC9-based OPVs is originated from a better compromise between charge generation and non-radiative charge recombination, compared with the corresponding symmetric ones. This work provides a high-performing molecule and paves the way for high-performance OPVs through asymmetric molecular design.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1981344

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 18 Vol. 32; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Compromising Charge Generation and Recombination with Asymmetric Molecule for High-Performance Binary Organic Photovoltaics with Over 18% Certified Efficiency

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