Abstract
A non-conjugated polymer acceptor PF1-TS4 was firstly synthesized by embedding a thioalkyl segment in the mainchain, which shows excellent photophysical properties on par with a fully conjugated polymer, with a low optical band gap of 1.58 eV and a high absorption coefficient >105 cm−1, a high LUMO level of −3.89 eV, and suitable crystallinity. Matched with the polymer donor PM6, the PF1-TS4-based all-PSC achieved a power conversion efficiency (PCE) of 8.63 %, which is ≈45 % higher than that of a device based on the small molecule acceptor counterpart IDIC16. Moreover, the PF1-TS4-based all-PSC has good thermal stability with ≈70 % of its initial PCE retained after being stored at 85 °C for 180 h, while the IDIC16-based device only retained ≈50 % of its initial PCE when stored at 85 °C for only 18 h. Our work provides a new strategy to develop efficient polymer acceptor materials by linkage of conjugated units with non-conjugated thioalkyl segments.
Original language | English |
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Journal | Angewandte Chemie - International Edition |
Volume | 59 |
Issue number | 45 |
Pages (from-to) | 19835-19840 |
Number of pages | 6 |
ISSN | 1433-7851 |
DOIs | |
Publication status | Published - 2 Nov 2020 |
Bibliographical note
Funding Information:We are thankful for support from the Swedish Research Council (2015-04853, 2016-06146, 2019-04683), the Swedish Research Council Formas, and the Wallenberg Foundation (2017.0186, 2016.0059). W.Z., Y.L. and L.H. thank the Guangzhou Municipal Science and Technology Bureau (201804010501, 201904010381), Department of Education of Guangdong Province (2018GKTSCX041, 2017GKCXTD001), Department of Science and Technology of Guangdong Province (2016A010103046, 2019B1515120073, 2019B090921002), NSFC project (61774077) and China Scholarship Council (201908440047). D.Y. thanks the Sino-Danish Centre for Education and Research. M.Z. and X.G. are thankful for NSFC projects (51773142 and 51973146). W.S. acknowledges project funding by the China Postdoctoral Science Foundation (2020M673054).
Publisher Copyright:
© 2020 The Authors. Published by Wiley-VCH GmbH
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
Keywords
- all-polymer solar cells
- non-conjugated polymer acceptors
- power conversion efficiency
- thermal stability
- thioalkyl chain linkages