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XPS analysis of the chemical degradation of PTB7 polymers for organic photovoltaics.

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Title: XPS analysis of the chemical degradation of PTB7 polymers for organic photovoltaics.
Authors: Kettle, J.1 j.kettle@bangor.ac.uk, Ding, Z.1, Horie, M.2, Smith, G.C.3
Source: Organic Electronics. Dec2016, Vol. 39, p222-228. 7p.
Subjects: Photovoltaic power generation, X-ray photoelectron spectroscopy, Chemical decomposition, Photodegradation, Chemical stability, Polymers
Abstract: The chemical degradation of the Poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5- b' ]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4- b ]thiophenediyl]] or ‘ PTB7’ has been studied using X-ray Photoelectron Spectroscopy (XPS). This material system appears to be intrinsically unstable especially when illuminated in air and XPS studies confirm the rapid photo-degradation is related to changes in chemical structure of the polymer. In particular, XPS spectra show an initial reduction in relative C C intensity, suggests loss of the alkoxy side chains. This is followed by a dramatic increase in the level of oxygen-bonded species, especially C O at ∼286.5 eV and C(=O)O at 289.2 eV, indicative of COOH and OH group formation, and oxidation of S. The XPS results support the view that using processing additives reduces the chemical stability of the polymer and provides insight into strategies to improve molecular design to ensure higher chemical stability. [ABSTRACT FROM AUTHOR]
Copyright of Organic Electronics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 119483113
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  Data: XPS analysis of the chemical degradation of PTB7 polymers for organic photovoltaics.
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  Data: <searchLink fieldCode="AR" term="%22Kettle%2C+J%2E%22">Kettle, J.</searchLink><relatesTo>1</relatesTo><i> j.kettle@bangor.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Ding%2C+Z%2E%22">Ding, Z.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Horie%2C+M%2E%22">Horie, M.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Smith%2C+G%2EC%2E%22">Smith, G.C.</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Organic+Electronics%22">Organic Electronics</searchLink>. Dec2016, Vol. 39, p222-228. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Photovoltaic+power+generation%22">Photovoltaic power generation</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+photoelectron+spectroscopy%22">X-ray photoelectron spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+decomposition%22">Chemical decomposition</searchLink><br /><searchLink fieldCode="DE" term="%22Photodegradation%22">Photodegradation</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+stability%22">Chemical stability</searchLink><br /><searchLink fieldCode="DE" term="%22Polymers%22">Polymers</searchLink>
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  Data: The chemical degradation of the Poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5- b' ]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4- b ]thiophenediyl]] or ‘ PTB7’ has been studied using X-ray Photoelectron Spectroscopy (XPS). This material system appears to be intrinsically unstable especially when illuminated in air and XPS studies confirm the rapid photo-degradation is related to changes in chemical structure of the polymer. In particular, XPS spectra show an initial reduction in relative C C intensity, suggests loss of the alkoxy side chains. This is followed by a dramatic increase in the level of oxygen-bonded species, especially C O at ∼286.5 eV and C(=O)O at 289.2 eV, indicative of COOH and OH group formation, and oxidation of S. The XPS results support the view that using processing additives reduces the chemical stability of the polymer and provides insight into strategies to improve molecular design to ensure higher chemical stability. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Organic Electronics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.orgel.2016.10.016
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: X-ray photoelectron spectroscopy
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      – SubjectFull: Chemical decomposition
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      – SubjectFull: Photodegradation
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      – SubjectFull: Chemical stability
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      – SubjectFull: Polymers
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      – TitleFull: XPS analysis of the chemical degradation of PTB7 polymers for organic photovoltaics.
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              Text: Dec2016
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