Air Exposure Induced Recombination in PTB7: PC71BM Solar Cells

Stuart Thomson; Stephen Hogg; Ifor D. W. Samuel; David Keeble

doi:10.1039/C7TA03741D

Air Exposure Induced Recombination in PTB7: PC₇₁BM Solar Cells

Stuart Thomson, Stephen Hogg, Ifor D. W. Samuel, David Keeble (Lead / Corresponding author)

Physics

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

209 Downloads (Pure)

Abstract

Understanding degradation pathways in organic photovoltaic cells (OPV) is essential to achieve long term device stability and allow commercialisation. Upon exposure to 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, that form 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 ½ 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.

Original language	English
Pages (from-to)	21926-21935
Number of pages	10
Journal	Journal of Materials Chemistry A: Materials for Energy and Sustainability
Volume	41
Early online date	12 Oct 2017
DOIs	https://doi.org/10.1039/C7TA03741D
Publication status	Published - 7 Nov 2017

Keywords

organic electronics
photovltaic devices
conjugated polymers
fullerenes

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1039/C7TA03741DLicence: CC BY

Final Published Version
© The Royal Society of Chemistry 2017. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Final published version, 1.74 MBLicence: CC BY

Air Exposure Induced Recombination in PTB7:PC71BM Solar Cells (Dataset)
Thomson, S. A. J. (Creator), Hogg, S. C. (Creator), Samuel, I. D. W. (Creator) & Keeble, D. J. (Creator), University of St Andrews, 9 Feb 2018
DOI: 10.17630/cab0e1d8-d12a-4f73-a692-01dcd8aae516, https://research-portal.st-andrews.ac.uk/en/datasets/air-exposure-induced-recombination-in-ptb7pc71bm-solar-cells-data
Dataset

Keeble, David
- Physics - Professor (Teaching and Research) of Condensed Matter and Materials
Person: Academic

Cite this

@article{f8e5e1d4984c44b79b44f35102d0c21f,

title = "Air Exposure Induced Recombination in PTB7: PC71BM Solar Cells",

abstract = "Understanding degradation pathways in organic photovoltaic cells (OPV) is essential to achieve long term device stability and allow commercialisation. Upon exposure to 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, that form 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 ½ 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.",

keywords = "organic electronics, photovltaic devices, conjugated polymers, fullerenes",

author = "Stuart Thomson and Stephen Hogg and Samuel, {Ifor D. W.} and David Keeble",

note = "SAJT acknowledges studentship funding from EPSRC under grant number EP/G03673X/1. IDWS acknowledges support EPSRC (EP/L012294/1) and a Royal Society Wolfson Research Merit Award. SCH 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) and wish to thank Dr. R.I. Hunter for technical assistance with the W band measurements. ",

year = "2017",

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doi = "10.1039/C7TA03741D",

language = "English",

volume = "41",

pages = "21926--21935",

journal = "Journal of Materials Chemistry A: Materials for Energy and Sustainability",

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TY - JOUR

T1 - Air Exposure Induced Recombination in PTB7

T2 - PC71BM Solar Cells

AU - Thomson, Stuart

AU - Hogg, Stephen

AU - Samuel, Ifor D. W.

AU - Keeble, David

N1 - SAJT acknowledges studentship funding from EPSRC under grant number EP/G03673X/1. IDWS acknowledges support EPSRC (EP/L012294/1) and a Royal Society Wolfson Research Merit Award. SCH 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) and wish to thank Dr. R.I. Hunter for technical assistance with the W band measurements.

PY - 2017/11/7

Y1 - 2017/11/7

N2 - Understanding degradation pathways in organic photovoltaic cells (OPV) is essential to achieve long term device stability and allow commercialisation. Upon exposure to 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, that form 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 ½ 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.

AB - Understanding degradation pathways in organic photovoltaic cells (OPV) is essential to achieve long term device stability and allow commercialisation. Upon exposure to 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, that form 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 ½ 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.

KW - organic electronics

KW - photovltaic devices

KW - conjugated polymers

KW - fullerenes

U2 - 10.1039/C7TA03741D

DO - 10.1039/C7TA03741D

M3 - Article

SN - 2050-7488

VL - 41

SP - 21926

EP - 21935

JO - Journal of Materials Chemistry A: Materials for Energy and Sustainability

JF - Journal of Materials Chemistry A: Materials for Energy and Sustainability

ER -

Air Exposure Induced Recombination in PTB7: PC71BM Solar Cells

Abstract

Keywords

UN SDGs

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Datasets

Air Exposure Induced Recombination in PTB7:PC71BM Solar Cells (Dataset)

Profiles

Keeble, David

Cite this

Air Exposure Induced Recombination in PTB7: PC₇₁BM Solar Cells