@article{Speller:2019:10.1021/acsenergylett.9b00109,
author = {Speller, EM and Clarke, AJ and Aristidou, N and Wyatt, MF and Francàs, L and Fish, G and Cha, H and Lee, HKH and Luke, J and Wadsworth, A and Evans, AD and McCulloch, I and Kim, JS and Haque, SA and Durrant, JR and Dimitrov, SD and Tsoi, WC and Li, Z},
doi = {10.1021/acsenergylett.9b00109},
journal = {ACS Energy Letters},
pages = {846--852},
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},
url = {http://dx.doi.org/10.1021/acsenergylett.9b00109},
volume = {4},
year = {2019}
}

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TY  - JOUR
AB  - 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.
AU  - Speller,EM
AU  - Clarke,AJ
AU  - Aristidou,N
AU  - Wyatt,MF
AU  - Francàs,L
AU  - Fish,G
AU  - Cha,H
AU  - Lee,HKH
AU  - Luke,J
AU  - Wadsworth,A
AU  - Evans,AD
AU  - McCulloch,I
AU  - Kim,JS
AU  - Haque,SA
AU  - Durrant,JR
AU  - Dimitrov,SD
AU  - Tsoi,WC
AU  - Li,Z
DO  - 10.1021/acsenergylett.9b00109
EP  - 852
PY  - 2019///
SN  - 2380-8195
SP  - 846
TI  - Toward improved environmental stability of polymer:fullerene and polymer:non-fullerene organic solar cells: a common energetic origin of light and oxygen induced degradation
T2  - ACS Energy Letters
UR  - http://dx.doi.org/10.1021/acsenergylett.9b00109
UR  - http://hdl.handle.net/10044/1/69117
VL  - 4
ER  - 

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