Hexanary blends: a strategy towards thermally stable organic photovoltaics

Sri Harish Kumar Paleti*, Sandra Hultmark, Jianhua Han, Yuanfan Wen, Han Xu, Si Chen, Emmy Järsvall, Ishita Jalan, Diego Rosas Villalva, Anirudh Sharma, Jafar I. Khan, Ellen Moons, Ruipeng Li, Liyang Yu, Julien Gorenflot, Frédéric Laquai, Christian Müller*, Derya Baran*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Non-fullerene based organic solar cells display a high initial power conversion efficiency but continue to suffer from poor thermal stability, especially in case of devices with thick active layers. Mixing of five structurally similar acceptors with similar electron affinities, and blending with a donor polymer is explored, yielding devices with a power conversion efficiency of up to 17.6%. The hexanary device performance is unaffected by thermal annealing of the bulk-heterojunction active layer for at least 23 days at 130 °C in the dark and an inert atmosphere. Moreover, hexanary blends offer a high degree of thermal stability for an active layer thickness of up to 390 nm, which is advantageous for high-throughput processing of organic solar cells. Here, a generic strategy based on multi-component acceptor mixtures is presented that permits to considerably improve the thermal stability of non-fullerene based devices and thus paves the way for large-area organic solar cells.

Original languageEnglish (US)
Article number4608
JournalNature Communications
Volume14
Issue number1
DOIs
StatePublished - Dec 2023

Bibliographical note

Funding Information:
This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: OSR-CARF/CCF-3079 and OSR-CRG2018-3746. S.H., E.J., C.M., I.J. and E.M. gratefully acknowledge financial support from the Knut and Alice Wallenberg Foundation through the project “Mastering Morphology for Solution-borne Electronics” (grant number 2016.0059). S.H. and C.M. acknowledge support from the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under grant agreement no. OSR-2019-CPF-4106. The authors thank the National Synchrotron Light Source II (NSLS-II, Contract No. DE-SC0012704), Brookhaven National Laboratory for providing GIWAXS experiment time. S.H.K.P. acknowledges the timely help of L. Lanzetta with hyperspectral PL imaging studies.

Funding Information:
This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: OSR-CARF/CCF-3079 and OSR-CRG2018-3746. S.H., E.J., C.M., I.J. and E.M. gratefully acknowledge financial support from the Knut and Alice Wallenberg Foundation through the project “Mastering Morphology for Solution-borne Electronics” (grant number 2016.0059). S.H. and C.M. acknowledge support from the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under grant agreement no. OSR-2019-CPF-4106. The authors thank the National Synchrotron Light Source II (NSLS-II, Contract No. DE-SC0012704), Brookhaven National Laboratory for providing GIWAXS experiment time. S.H.K.P. acknowledges the timely help of L. Lanzetta with hyperspectral PL imaging studies.

Publisher Copyright:
© 2023, The Author(s).

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology
  • General Physics and Astronomy

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