Sequentially regular polymer acceptors featuring flexible spacers for high-performance and mechanically robust all-polymer solar cellsopen access
- Authors
- Lee, Jin-Woo; Sun, Cheng; Lee, Sun-Woo; Kim, Geon-U; Li, Sheng; Wang, Cheng; Kim, Taek-Soo; Kim, Yun-Hi; Kim, Bumjoon J.
- Issue Date
- Nov-2022
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- ENERGY & ENVIRONMENTAL SCIENCE, v.15, no.11, pp 4672 - 4685
- Pages
- 14
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENERGY & ENVIRONMENTAL SCIENCE
- Volume
- 15
- Number
- 11
- Start Page
- 4672
- End Page
- 4685
- URI
- https://scholarworks.gnu.ac.kr/handle/sw.gnu/29688
- DOI
- 10.1039/d2ee02523j
- ISSN
- 1754-5692
1754-5706
- Abstract
- 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 PCE80% = 36.7%).
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