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Sökning: WFRF:(Lindqvist Camilla 1985) > (2015)

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1.
  • George, Zandra, 1985, et al. (författare)
  • Improved performance and life time of inverted organic photovoltaics by using polymer interfacial materials
  • 2015
  • Ingår i: Solar Energy Materials and Solar Cells. - : Elsevier BV. - 0927-0248. ; 133, s. 99-104
  • Tidskriftsartikel (refereegranskat)abstract
    • A previously published fluorene based interlayer polymer is here compared to three similar polymers where the fluorene monomer has been exchanged with monomers that have been reported to have a higher photo-chemical stability. The polymer interlayers have been studied in terms of their influence on device performance and stability on inverted devices with an active layer of P3HT:PC61BM. By acting as a hole-blocking layer the polymers are able to increase the efficiency of the devices with similar to 50% compared to devices with an ITO cathode. In addition, the polymers also improve the photo-stability of the devices, mainly as an effect of a reduced decrease in open-circuit voltage and fill factor. This indicates that solution processable polymer interlayers could be a way towards both higher efficiency and improved stability of inverted organic solar cells.
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2.
  • Bäcke, Olof, 1984, et al. (författare)
  • Mapping fullerene crystallization in a photovoltaic blend: an electron tomography study
  • 2015
  • Ingår i: Nanoscale. - : Royal Society of Chemistry (RSC). - 2040-3372 .- 2040-3364. ; 7:18, s. 8451-8456
  • Tidskriftsartikel (refereegranskat)abstract
    • The formation of fullerene crystals represents a major degradation pathway of polymer/fullerene bulk-heterojunction thin films that inexorably deteriorates their photovoltaic performance. Currently no tools exist that reveal the origin of fullerene crystal formation vertically through the film. Here, we show that electron tomography can be used to study nucleation and growth of fullerene crystals. A model bulk-heterojunction blend based on a thiophene-quinoxaline copolymer and a fullerene derivative is examined after controlled annealing above the glass transition temperature. We image a number of fullerene nanocrystals, ranging in size from 70 to 400 nanometers, and observe that their center is located close to the free-surface of spin-coated films. The results show that the nucleation of fullerene crystals predominately occurs in the upper part of the films. Moreover, electron tomography reveals that the nucleation is preceded by more pronounced phase separation of the blend components.
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