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Toward improved environmental stability of polymer:fullerene and polymer:non-fullerene organic solar cells: a common energetic origin of light and oxygen induced degradation

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Title: Toward improved environmental stability of polymer:fullerene and polymer:non-fullerene organic solar cells: a common energetic origin of light and oxygen induced degradation
Authors: Speller, EM
Clarke, AJ
Aristidou, N
Wyatt, MF
Francàs, L
Fish, G
Cha, H
Lee, HKH
Luke, J
Wadsworth, A
Evans, AD
McCulloch, I
Kim, JS
Haque, SA
Durrant, JR
Dimitrov, SD
Tsoi, WC
Li, Z
Item Type: Journal Article
Abstract: With the emergence of nonfullerene electron acceptors resulting in further breakthroughs in the performance of organic solar cells, there is now an urgent need to understand their degradation mechanisms in order to improve their intrinsic stability through better material design. In this study, we present quantitative evidence for a common root cause of light-induced degradation of polymer:nonfullerene and polymer:fullerene organic solar cells in air, namely, a fast photo-oxidation process of the photoactive materials mediated by the formation of superoxide radical ions, whose yield is found to be strongly controlled by the lowest unoccupied molecular orbital (LUMO) levels of the electron acceptors used. Our results elucidate the general relevance of this degradation mechanism to both polymer:fullerene and polymer:nonfullerene blends and highlight the necessity of designing electron acceptor materials with sufficient electron affinities to overcome this challenge, thereby paving the way toward achieving long-term solar cell stability with minimal device encapsulation.
Issue Date: 12-Apr-2019
Date of Acceptance: 12-Mar-2019
URI: http://hdl.handle.net/10044/1/69117
DOI: https://dx.doi.org/10.1021/acsenergylett.9b00109
ISSN: 2380-8195
Publisher: American Chemical Society
Start Page: 846
End Page: 852
Journal / Book Title: ACS Energy Letters
Volume: 4
Copyright Statement: © 2019 American Chemical Society
Sponsor/Funder: Engineering and Physical Sciences Research Council
CSEM Brasil
Funder's Grant Number: EP/L016702/1
Publication Status: Published
Embargo Date: 2020-03-12
Online Publication Date: 2019-03-12
Appears in Collections:Physics
Chemistry
Experimental Solid State
Faculty of Natural Sciences



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