4.8 Article

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

Journal

ENERGY & ENVIRONMENTAL SCIENCE
Volume 15, Issue 11, Pages 4672-4685

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ee02523j

Keywords

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Funding

  1. National Research Foundation of Korea [2020R1A4A1018516, 2021R1A2B5B03086367]
  2. DOE Office of Science User Facility [DE-AC02-05CH11231]
  3. National Research Foundation of Korea [2021R1A2B5B03086367, 2020R1A4A1018516] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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This study achieves highly efficient and mechanically robust polymer solar cells by designing a polymerized small-molecule acceptor with regular flexible spacers. The resulting solar cells show high power conversion efficiency and stretchability, and are fabricated using an environmentally friendly solvent process.
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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