Kilbride, R.C. orcid.org/0000-0002-3985-923X, Spooner, E.L.K. orcid.org/0000-0001-9575-550X, Cassella, E.J. orcid.org/0000-0003-4897-1650 et al. (5 more authors) (2024) Exploring the impact of 1,8-Diioodoctane on the Photostability of Organic Photovoltaics. ACS Applied Energy Materials, 7 (19). pp. 8401-8411. ISSN 2574-0962
Abstract
Improving the photostability of the light-harvesting blend film in organic photovoltaics is crucial to achieving long-term operational lifetimes that are required for commercialization. However, understanding the degradation factors which drive instabilities is complex, with many variables such as film morphology, residual solvents, and acceptor or donor design all influencing how light and oxygen interact with the blend film. In this work, we show how blend films comprising a donor polymer (PBDB-T) and small molecule acceptor (PC71BM or ITIC) processed with solvent additive (DIO) yield very different film morphologies, device performance, and photostability. We show that DIO is retained approximately 10 times more effectively in ITIC based films compared to PC71BM. Unexpectedly, we see that while high volumes of DIO reduce photostability for encapsulated ITIC devices, when oxygen is introduced DIO can improve the lifetime of PBDB-T:ITIC based cells. Here, the addition of 3% DIO doubles the T80 compared to ITIC based devices without DIO, suggesting that DIO-induced morphological changes interfere with or reduce photo-oxidative reactions.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY 4.0. (https://creativecommons.org/licenses/by/4.0/) |
Keywords: | organic photovoltaics; bulk heterojunctions; photostability 1,8-dioodoctane; solvent additives; crystallinity |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematical and Physical Sciences |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/V055127/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/V027131/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/M028437/1 Engineering and Physical Sciences Research Council EP/V034804/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 16 Oct 2024 15:05 |
Last Modified: | 16 Oct 2024 15:05 |
Status: | Published |
Publisher: | American Chemical Society (ACS) |
Refereed: | Yes |
Identification Number: | 10.1021/acsaem.4c01272 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:218426 |