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Search: WFRF:(Züfle Simon)

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1.
  • Meitzner, Rico, et al. (author)
  • Impact of P3HT materials properties and layer architecture on OPV device stability
  • 2019
  • In: Solar Energy Materials and Solar Cells. - : Elsevier BV. - 0927-0248. ; 202
  • Journal article (peer-reviewed)abstract
    • We report a cooperative study conducted between different laboratories to investigate organic solar cell degradation with respect to P3HT material properties and different solar cell architectures. Various batches of P3HT were collected from different suppliers reflecting commercial availability as well as properties variability. Among the materials properties explicitly considered were the molar mass, dispersity, regio-regularity, impurities by trace metals and intrinsic doping evaluated from radical concentrations. Each of the participating laboratories contributing test devices applied their own layer stack, i.e. their own device architecture and layout. This variation was appreciated as another parameter for evaluation. Even though a large amount of devices failed due to extrinsic degradation effects, indeed, some materials properties were found to be more important than others for obtaining long lifetimes and high stability of P3HT-based polymer solar cells.
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2.
  • Züfle, Simon, et al. (author)
  • Initial photo-degradation of PCDTBT:PC 70 BM solar cells studied under various illumination conditions : Role of the hole transport layer
  • 2019
  • In: Solar Energy. - : Elsevier. - 0038-092X .- 1471-1257. ; 183:1, s. 234-239
  • Journal article (peer-reviewed)abstract
    • ncapsulated organic solar cells often show a burn-in behaviour under illumination. This burn-in manifests itself as a rapid performance loss followed by a much slower progression of the degradation. Here we investigate the burn-in for PCDTBT:PC 70 BM solar cells under a wide range of illumination intensities. We find that increasing the sunlight concentration from 1 Sun to up to 100 Suns does not change the degradation behaviour, i.e. the dependence of all principal photovoltaic parameters on the dose of solar exposure (in Sun hours). This suggests that the degradation mechanisms under solar concentration (≤100 Suns) are the same as those observed under 1 Sun. This result makes it possible to use concentrated sunlight for accelerated stability assessment of these devices. We also find that devices with PEDOT:PSS as hole transport material show a rapid drop in open-circuit voltage of around 100 mV during the first Sun hour of light exposure. By replacing PEDOT:PSS with MoO 3 this initial process can be prevented and only the much slower part of the photo-degradation takes place.
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