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Air exposure induced recombination in PTB7:PC71BM solar cells

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Abstract

Understanding degradation pathways in organic photovoltaic cells (OPV) is essential to achieve long term device stability and allow commercialisation. Upon exposure to an ambient atmosphere the power conversion efficiency (PCE) of PTB7:PC71BM solar cells, cast using the solvent additive DIO, is markedly reduced. Using electrically detected magnetic resonance (EDMR) spectroscopy, trap sites, which are formed when the blend is exposed to air and DIO, are identified. Spin-Rabi oscillations reveal that the resonance arises from a weakly coupled pair of spin 1/2 species, while selective injection of charge carriers into the cell demonstrates that the spin-pair corresponds to recombination of electrons and holes. The recombination is assigned to holes on the PTB7 recombining with electrons localised to oxygen induced PC71BM trap sites.

Graphical abstract: Air exposure induced recombination in PTB7:PC71BM solar cells

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Publication details

The article was received on 01 May 2017, accepted on 23 Sep 2017 and first published on 12 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA03741D
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Air exposure induced recombination in PTB7:PC71BM solar cells

    S. A. J. Thomson, S. C. Hogg, I. D. W. Samuel and D. J. Keeble, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA03741D

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