XPS Analysis of the chemical degradation of PTB7 polymers for organic photovoltaics
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Bangor University, National Tsing Hua University, Taiwan, University of ChesterPublication Date
2016-10-14
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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.Citation
Kettle, J., Ding, Z., Horie, M., & Smith, G. C. (2016). XPS analysis of the chemical degradation of PTB7 polymers for organic photovoltaics. Organic Electronics, 39, 222-228. doi: http://dx.doi.org/10.1016/j.orgel.2016.10.016Publisher
ElsevierJournal
Organic ElectronicsAdditional Links
http://www.sciencedirect.com/science/article/pii/S1566119916304438Type
ArticleLanguage
enISSN
1566-1199ae974a485f413a2113503eed53cd6c53
10.1016/j.orgel.2016.10.016
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