Alternative selection of processing additives to enhance the lifetime of OPVs
AffiliationUniversity of Bangor (Kettle, Waters), National Tsing Hua University Taiwan (Horie), University of Chester (Smith)
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AbstractThe use of processing additives is known to accelerate the degradation of Organic Photovoltaics (OPVs) and therefore, this paper studies the impact of selecting alternative processing additives for PCPDTBT:PC71BM solar cells in order to improve the stability. The use of naphthalene-based processing additives has been undertaken, which is shown to reduce the initial power conversion efficiency by 23%-42%, primarily due to a decrease in the short-circuit current density, but also fill factor. However, the stability is greatly enhanced by using such additives, with the long term stability (T50%) enhanced by a factor of four. The results show that there is a trade-off between initial performance and stability to consider when selecting the initial process additives. XPS studies have provided some insight into the decreased degradation and show that using 1-chloronaphthalene (ClN) leads to reduced morphology changes and reduced oxidation of the thiophene-ring within the PCPDTBT backbone.
CitationKettle, J., Waters, H., Horie, M., Smith, Graham C. (2016). Alternative selection of processing additives to enhance the lifetime of OPVs. Journal of Physics D: Applied Physics, 49(8). DOI: 10.1088/0022-3727/49/8/085601
SponsorsHW would like to thank Bangor University for his 125 scholarship enabling his PhD study. JK would like to thank Sêr Cymru national research network in Advanced Engineering and Materials and the Newton Research Collaboration Programme scheme through the Royal Academy for Engineering
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