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Air exposure induced recombination in PTB7:PC71BM solar cells

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Thomson_2017_JMCA_AirExposure_CC.pdf (1.702Mb)
Date
07/11/2017
Author
Thomson, Stuart A. J.
Hogg, Stephen C.
Samuel, Ifor D. W.
Keeble, David J.
Funder
EPSRC
EPSRC
The Wellcome Trust
EPSRC
Grant ID
EP/F039034/1
EP/L012294/1
099149/Z/12/Z
EP/F039034/1
Keywords
QD Chemistry
QC Physics
NDAS
SDG 7 - Affordable and Clean Energy
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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.
Citation
Thomson , S A J , Hogg , S C , Samuel , I D W & Keeble , D J 2017 , ' Air exposure induced recombination in PTB7:PC 71 BM solar cells ' , Journal of Materials Chemistry A , vol. 5 , no. 41 , pp. 21926-21935 . https://doi.org/10.1039/c7ta03741d
Publication
Journal of Materials Chemistry A
Status
Peer reviewed
DOI
https://doi.org/10.1039/c7ta03741d
ISSN
2050-7488
Type
Journal article
Rights
© 2017 The Authors. Open Access article. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Description
SAJT acknowledges studentship funding from EPSRC under grant number EP/G03673X/1. I. D. W. S. acknowledges support EPSRC (EP/L012294/1) and a Royal Society Wolfson Research Merit Award. S. C. H. acknowledges funding from EPSRC under grant number EP/J500045/1. We also acknowledge support from the Wellcome Trust (099149) and from EPSRC (EP/F039034/1)
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12071

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