Tuning polymer-backbone coplanarity and conformational order to achieve high-performance printed all-polymer solar cells

Wu, Yilei; Yuan, Yue; Sorbelli, Diego; Cheng, Christina; Michalek, Lukas; Cheng, Hao-Wen; Jindal, Vishal; Zhang, Song; LeCroy, Garrett; Gomez, Enrique D.; Milner, Scott T.; Salleo, Alberto; Galli, Giulia; Asbury, John B.; Toney, Michael F.; Bao, Zhenan

doi:10.1038/s41467-024-46493-4

Title: Tuning polymer-backbone coplanarity and conformational order to achieve high-performance printed all-polymer solar cells

Journal Article · 08 March 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-46493-4 · OSTI ID:2322453

; Yuan, Yue;

; Cheng, Christina;

; Cheng, Hao-Wen;

; Zhang, Song; LeCroy, Garrett;

; Milner, Scott T.;

;

; Asbury, John B.;

;

Abstract All-polymer solar cells (all-PSCs) offer improved morphological and mechanical stability compared with those containing small-molecule-acceptors (SMAs). They can be processed with a broader range of conditions, making them desirable for printing techniques. In this study, we report a high-performance polymer acceptor design based on bithiazole linker (PY-BTz) that are on par with SMAs. We demonstrate that bithiazole induces a more coplanar and ordered conformation compared to bithiophene due to the synergistic effect of non-covalent backbone planarization and reduced steric encumbrances. As a result, PY-BTz shows a significantly higher efficiency of 16.4% in comparison to the polymer acceptors based on commonly used thiophene-based linkers (i.e., PY-2T, 9.8%). Detailed analyses reveal that this improvement is associated with enhanced conjugation along the backbone and closer interchain π-stacking, resulting in higher charge mobilities, suppressed charge recombination, and reduced energetic disorder. Remarkably, an efficiency of 14.7% is realized for all-PSCs that are solution-sheared in ambient conditions, which is among the highest for devices prepared under conditions relevant to scalable printing techniques. This work uncovers a strategy for promoting backbone conjugation and planarization in emerging polymer acceptors that can lead to superior all-PSCs.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Office of Naval Research (ONR); USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2322453

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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