Flexible-spacer incorporated polymer donors enable superior blend miscibility for high-performance and mechanically-robust polymer solar cells

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Developing polymer solar cells (PSCs) with high photovoltaic performance and mechanical robustness is one of the most urgent tasks to ensure their operational reliability and applicability in wearable devices. However, it remains challenging to enhance their mechanical properties without compromising the electrical properties of high-performance active materials. Here, we develop a series of novel polymer donors (P(D)s), with which highly efficient PSCs having remarkable mechanical reliability are demonstrated. By interposing a controlled amount of 1,10-di(thiophen-2-yl)decane flexible spacer (FS) into a PM6 backbone, we are able to significantly enhance the intermixing of the new P(D)s with a small molecule acceptor (Y7), affording sufficient pathways for efficient charge percolation and mechanical stress dissipation. As a result, PSCs based on the P-D containing 5 mol% FS units and Y7 exhibit a high power conversion efficiency (PCE) of 17% with a crack onset strain (COS) of 12% and a cohesive fracture energy (G(c)) of 2.1 J m(-2), significantly outperforming reference PM6-based devices (PCE = 15%, COS = 2% and G(c) = 1.0 J m(-2)). Both the photovoltaic performance and mechanical robustness of these PSCs are among the best values reported to date. The rational design of the P(D)s demonstrated here presents a highly promising strategy to address the mechanical properties of SMA-based solar cells and their viable application in flexible/stretchable electronics.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2021-07
Language
English
Article Type
Article
Citation

ENERGY & ENVIRONMENTAL SCIENCE, v.14, no.7, pp.4067 - 4076

ISSN
1754-5692
DOI
10.1039/d1ee01062j
URI
http://hdl.handle.net/10203/286929
Appears in Collection
CBE-Journal Papers(저널논문)ME-Journal Papers(저널논문)
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