Polymerized Small Molecular Acceptor with Branched Side Chains for All Polymer Solar Cells with Efficiency over 16.7%

Li, Yun; Song, Jiali; Dong, Yicai; Jin, Hui; Xin, Jingming; Wang, Shijie; Cai, Yunhao; Jiang, Lang; Ma, Wei; Tang, Zheng; Sun, Yanming

doi:10.1002/adma.202110155

Title: Polymerized Small Molecular Acceptor with Branched Side Chains for All Polymer Solar Cells with Efficiency over 16.7%

Journal Article · 27 January 2022 · Advanced Materials

DOI: https://doi.org/10.1002/adma.202110155 · OSTI ID:1981353

Li, Yun ^[1]; Song, Jiali ^[1]; Dong, Yicai ^[2]; Jin, Hui ^[3]; Xin, Jingming ^[4]; Wang, Shijie ^[4]; Cai, Yunhao ^[1]; Jiang, Lang ^[2]; Ma, Wei ^[4]; Tang, Zheng ^[3];

^[1]

Beihang University, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China)
Donghua University, Shanghai (China)
Xi'an Jiaotong Univ. (China)

The power conversion efficiencies (PCEs) of small molecule acceptor (SMA)-based organic solar cells have already exceeded 18%. However, the development of polymer acceptors still lags far behind their SMA counterparts mainly due to the lack of efficient polymer acceptors. In this work, a series of polymer acceptors named PY-X (with X being the branched alkyl chain) are designed and synthesized by employing the same central core with the SMA L8-BO but with different branched alkyl chains on the pyrrole motif. It is found that the molecular packing of SMA-HD featuring 2-hexyldecyl side chain used in the synthesis of PY-HD is similar to L8-BO, in which the branched alkyl chains lead to condensed and high-order molecular assembly in SMA-HD molecules. When combined with PM6, PY-HD-based all polymer solar cell (all-PSC) exhibits a high PCE of 16.41%, representing the highest efficiency for the binary all-PSCs. Moreover, the side-chain modification on the pyrrole site position further improves the performance of the all-PSCs, and the PY-DT-based device delivers a new record high efficiency of 16.76% (certified as 16.3%). The work provides new insights for understanding the structure–property relationship of polymer acceptors and paves a feasible avenue to develop efficient conjugated polymer acceptors.

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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:: 1981353

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 14 Vol. 34; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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