Sequentially regular polymer acceptors featuring flexible spacers for high-performance and mechanically robust all-polymer solar cells

Lee, Jin-Woo; Sun, Cheng; Lee, Sun-Woo; Kim, Geon-U; Li, Sheng; Wang, Cheng; Kim, Taek-Soo; Kim, Yun-Hi; Kim, Bumjoon J.

doi:10.1039/d2ee02523j

Sequentially regular polymer acceptors featuring flexible spacers for high-performance and mechanically robust all-polymer solar cells

Journal Article · Fri Sep 16 00:00:00 EDT 2022 · Energy & Environmental Science

DOI:https://doi.org/10.1039/d2ee02523j· OSTI ID:1994314

Lee, Jin-Woo ^[1]; Sun, Cheng ^[2]; Lee, Sun-Woo ^[1]; Kim, Geon-U ^[1]; ^[1]; Wang, Cheng ^[3]; ^[1]; ^[2]; ^[1]

Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of)
Gyeongsang National Univ., Jinju (Korea, Republic of)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Developing high-performance and mechanically robust polymer solar cells (PSCs) is crucial for realizing wearable power sources. While efficient all-polymer solar cells (all-PSCs) can be fabricated from polymerized small-molecule acceptors (PSMAs) with high optical absorption and electron mobilities, they still show limited mechanical robustness. Here, we achieve highly efficient and mechanically robust all-PSCs by designing a PSMA (PYFS-Reg) containing sequence-regular flexible spacers (FSs). The regular incorporation of the FS units into PSMAs is essential in simultaneously improving the electrical and mechanical properties of blend films. As a result, all-PSCs featuring PYFS-Reg achieve a high power conversion efficiency (PCE = 16.1%) and stretchability (crack onset strain (COS) = 22.4%), outperforming PSMAs without FSs (i.e., PYBDT, PCE = 12.6% and COS = 11.7%) or with randomly distributed FSs (i.e., PYFS-Ran, PCE = 12.2% and COS = 18.1%). Importantly, these all-PSCs are fabricated by an environmentally benign, non-halogenated solvent process. To further demonstrate their feasible applications in wearable devices, we construct intrinsically stretchable (IS) all-PSCs by using PYFS-Reg-based active layers, which exhibit a high PCE (10.6%) and excellent device stretchability (strain at PCE_80% = 36.7%).

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Research Foundation of Korea; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1994314

Journal Information:: Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 11 Vol. 15; ISSN 1754-5692

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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