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Investigating the Photostability of Organic Photovoltaics for Indoor and Outdoor Applications

Andrew Clarke, Emily J. Yang, Suzanne K. Thomas, Harrison Lee, Ann Hunter, Weixia Lan, Matt Carnie Orcid Logo, Ji‐Seon Kim, Wing Chung Tsoi Orcid Logo

Advanced Energy and Sustainability Research

Swansea University Authors: Andrew Clarke, Harrison Lee, Matt Carnie Orcid Logo, Wing Chung Tsoi Orcid Logo

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DOI (Published version): 10.1002/aesr.202300285

Abstract

Organic photovoltaics (OPVs) show great promise for both outdoor and indoor applications. However, there remains a lack of understanding around the stability of OPVs, particularly for indoor applications. In this work, the photostability of the poly[(thiophene)-alt-(6,7-difluoro-2-(2-hexyldecyloxy)qu...

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Published in: Advanced Energy and Sustainability Research
ISSN: 2699-9412 2699-9412
Published: Wiley 2024
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa65783
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Abstract: Organic photovoltaics (OPVs) show great promise for both outdoor and indoor applications. However, there remains a lack of understanding around the stability of OPVs, particularly for indoor applications. In this work, the photostability of the poly[(thiophene)-alt-(6,7-difluoro-2-(2-hexyldecyloxy)quinoxaline)]:2,2′-((2Z,2′Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile blend is investigated for both outdoor and indoor applications. Photostability is found to vary drastically with illumination intensity. Devices under high-intensity white light-emitting diode (LED) illumination, with their short-circuit current density (JSC) matching JSC–EQE for AM1.5 G illumination, lose 42% of their initial performance after 30 days of illumination. Contrastingly, after almost 47 days of illumination devices under 1000 lux white LED illumination show no loss in performance. The poor photostability under 1 sun illumination is linked to the poor photostability of IDIC. Through Raman spectroscopy and mass spectrometry, IDIC is found to suffer from photoisomerization, which detrimentally impacts light absorption and carrier extraction. In this work, it is highlighted that under low light levels, the requirement of intrinsic material photostability may be less stringent.
Keywords: IDIC; indoor applications; low light; organic photovoltaics; outdoor applications; photostability; Raman spectroscopy
College: Faculty of Science and Engineering
Funders: A.J.C. and W.C.T. would like to acknowledge the Materials andManufacturing Academy (M2A) funding from the European SocialFund via the Welsh Government and EPSRC project EP/L015099/1, theUKRI funding via Innovate UK project 133701, the EPSRC ATIP funding(EP/T028513/1), and NMSF at Swansea University. E.J.Y. and J.S.K. wouldlike to thank EPSRC ATIP and DTP funding. S.K.T. and M.C. would liketo thank ERDF for funding SPARC II. W.C.T. and W.L. would like toacknowledge the Foreign Expert Foundation of China funding (grantno. G2023013014L).