Air exposure induced recombination in PTB7:PC71BM solar cells

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

doi:10.1039/c7ta03741d

Air exposure induced recombination in PTB7:PC₇₁BM solar cells

Stuart A. J. Thomson, Stephen C. Hogg, Ifor D. W. Samuel, David J. Keeble

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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.

Original language	English
Pages (from-to)	21926-21935
Journal	Journal of Materials Chemistry A
Volume	5
Issue number	41
Early online date	12 Oct 2017
DOIs	https://doi.org/10.1039/c7ta03741d
Publication status	Published - 7 Nov 2017

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10.1039/c7ta03741dLicence: CC BY

Thomson_2017_JMCA_AirExposure_CC
© 2017 The Authors. Open Access article. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Final published version, 1.7 MBLicence: CC BY

Self-Assembled Organic Photovoltaic mat: Self-assembled organic photovoltaic materials
Samuel, I. D. W. (PI)
EPSRC
17/03/14 → 16/03/17
Project: Standard
State of the art pulse EPR instrumentati: State of the art pulse EPR instrumentation for long range distance measurements in biomacromolecules
Smith, G. M. (PI), Bode, B. E. (CoI), Naismith, J. (CoI), Schiemann, O. (CoI) & White, M. (CoI)
The Wellcome Trust
1/09/12 → 31/08/17
Project: Standard
EP/F0390034/1 The HIPER Project: Bringing the NMR Paradigm to ESR - The HIPER Project
Smith, G. M. (PI), El Mkami, H. (CoI) & Robertson, D. (CoI)
EPSRC
1/09/08 → 31/10/12
Project: Standard

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
Dataset

File

Cite this

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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 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.",

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

note = "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)",

year = "2017",

month = nov,

day = "7",

doi = "10.1039/c7ta03741d",

language = "English",

volume = "5",

pages = "21926--21935",

journal = "Journal of Materials Chemistry A",

issn = "2050-7488",

publisher = "ROYAL SOC CHEMISTRY",

number = "41",

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TY - JOUR

T1 - Air exposure induced recombination in PTB7:PC71BM solar cells

AU - Thomson, Stuart A. J.

AU - Hogg, Stephen C.

AU - Samuel, Ifor D. W.

AU - Keeble, David J.

N1 - 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)

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 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.

AB - 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.

U2 - 10.1039/c7ta03741d

DO - 10.1039/c7ta03741d

M3 - Article

SN - 2050-7488

VL - 5

SP - 21926

EP - 21935

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 41

ER -

Air exposure induced recombination in PTB7:PC71BM solar cells

Abstract

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Projects

Self-Assembled Organic Photovoltaic mat: Self-assembled organic photovoltaic materials

State of the art pulse EPR instrumentati: State of the art pulse EPR instrumentation for long range distance measurements in biomacromolecules

EP/F0390034/1 The HIPER Project: Bringing the NMR Paradigm to ESR - The HIPER Project

Datasets

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

Cite this

Air exposure induced recombination in PTB7:PC₇₁BM solar cells