A polymer library enables the rapid identification of a highly scalable and efficient donor material for organic solar cells.

Abstract
The dramatic improvement of the PCE (power conversion efficiency) of organic photovoltaic devices in the past few years has been driven by the development of new polymer donor materials and non-fullerene acceptors (NFAs). In the design of such materials synthetic scalability is often not considered, and hence complicated synthetic protocols are typical for high-performing materials. Here we report an approach to readily introduce a variety of solubilizing groups into a benzo[c][1,2,5]thiadiazole acceptor comonomer. This allowed for the ready preparation of a library of eleven donor polymers of varying side chains and comonomers, which facilitated a rapid screening of properties and photovoltaic device performance. Donor FO6-T emerged as the optimal material, exhibiting good solubility in chlorinated and non-chlorinated solvents and achieving 15.4% PCE with L8BO as the acceptor (15.2% with Y6) and good device stability. FO6-T was readily prepared on the gram scale, and synthetic complexity (SC) analysis highlighted FO6-T as an attractive donor polymer for potential large scale applications.

Citation
Rimmele, M., Qiao, Z., Panidi, J., Furlan, F., Lee, C., Tan, W. L., McNeill, C. R., Kim, Y., Gasparini, N., & Heeney, M. (2023). Polymer library enables the rapid identification of a highly scalable and efficient donor material for organic solar cells. Materials Horizons. https://doi.org/10.1039/d3mh00787a

Acknowledgements
We would like to thank the Engineering and Physics Science Research Council (EPSRC) (EP/V048686/1, EP/R513052/1 and EP/T028513/1), the Royal Society and Wolfson Foundation, and the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2020-CRG8-4095 for the financial support. This work was performed in part on the SAXS/WAXS beamline72 at the Australian Synchrotron, part of ANSTO. YK and CL appreciate financial support from the National Research Foundation (NRF) of Korea (2021R1I1A3A04037494).

Publisher
Royal Society of Chemistry (RSC)

Journal
Materials horizons

DOI
10.1039/d3mh00787a

PubMed ID
37599602

Additional Links
http://xlink.rsc.org/?DOI=D3MH00787A

Permanent link to this record