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Träfflista för sökning "WFRF:(Troshin Pavel) "

Search: WFRF:(Troshin Pavel)

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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.
  • Merdasa, Aboma, et al. (author)
  • Microscopic insight into the reversibility of photodegradation in MAPbI3 thin films
  • 2020
  • In: Journal of Luminescence. - : Elsevier BV. - 0022-2313. ; 219
  • Journal article (peer-reviewed)abstract
    • Whether optoelectronic devices based on metal-halide perovskite semiconductors will become a commercially viable technology will be determined by their intrinsic and operational stability. Recent results indicate there is some reversibility of perovskite degradation in thin films and devices, although mechanistic insight into the processes driving degradation and recovery are still scarce. We here present a comparative spectroscopic study of methylammonium lead iodide (MAPbI3) films having undergone either photo- or thermal degradation under controlled conditions. We confirm that the degradation mechanism pertaining to each type of stress is inherently different. Our results from photoluminescence microscopy measurements paint a spatially, spectrally and temporarily resolved picture showing that, unlike thermally degraded samples, photodegraded samples are in a state that intermittently recovers to luminescent MAPbI3 upon laser excitation. This indicates that rather than irreversibly decomposing, photoinduced degradation leaves MAPbI3 structurally or compositionally intact but induces defects causing non-radiative recombination losses.
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