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30 May 2022 Polymer acceptors with flexible spacers afford efficient and mechanically robust all-polymer solar cells
Ergang Wang, Zewdneh Genene
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Proceedings Volume PC12149, Organic Electronics and Photonics: Fundamentals and Devices III; PC121490I (2022) https://doi.org/10.1117/12.2622558
Event: SPIE Photonics Europe, 2022, Strasbourg, France
Abstract
All polymer solar cells (all-PSCs), consisting of a binary blend of a polymer donor (PD) and a polymer acceptor (PA), possess important advantages including enhanced morphological stability, improved mechanical flexibility, and better compatibility with large-area roll-to-roll production over small molecule acceptor (SMA)-based PSCs. High efficiency and mechanical robustness are both crucial for the practical applications of all-PSCs in stretchable and wearable electronics. In this regard, we report a series of new polymer acceptors (PAs) by incorporating a flexible conjugation-break spacer (FCBS) to achieve highly efficient and mechanically robust all-PSCs. Incorporation of FCBS affords the effective modulation of the crystallinity and pre-aggregation of the PAs, and achieves the optimal blend morphology with polymer donor (PD), increasing both the photovoltaic and mechanical properties of all-PSCs. In particular, the all-PSC based on PYTS-0.3 as a PA incorporated with 30% FCBS and a PD (PBDB-T) demonstrates a high power conversion efficiency (PCE) of 14.68% and excellent mechanical stretchability with a crack onset strain (COS) of 21.64% and toughness of 3.86 MJ m–3, which is significantly superior to those of devices with the PA without the FCBS (PYTS-0.0, PCE = 13.01% and toughness = 2.70 MJ m–3). To date, this COS is the highest value reported for PSCs with PCEs of over 8% without any insulating additives. These results reveal that the introduction of FCBS into the conjugated backbone is a highly feasible strategy to simultaneously improve the PCE and stretchability of PSCs resulting in their reliable applications in stretchable electronics.
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Ergang Wang and Zewdneh Genene "Polymer acceptors with flexible spacers afford efficient and mechanically robust all-polymer solar cells", Proc. SPIE PC12149, Organic Electronics and Photonics: Fundamentals and Devices III, PC121490I (30 May 2022); https://doi.org/10.1117/12.2622558
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KEYWORDS
Polymers
Solar cells
Mechanical efficiency
Protactinium
Electronics
Modulation
Molecular electronics
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