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1.
  • Unger, Eva L., et al. (author)
  • Effect of the Preparation Procedure on the Morphology of Thin TiO2 Films and Their Device Performance in Small-Molecule Bilayer Hybrid Solar Cells
  • 2012
  • In: ACS Applied Materials and Interfaces. - : American Chemical Society (ACS). - 1944-8244 .- 1944-8252. ; 4:11, s. 5997-6004
  • Journal article (peer-reviewed)abstract
    • Flat titanium dioxide films, to be used as the acceptor layer in bilayer hybrid solar cell devices, were prepared by spray-pyrolysis and by spin-casting. Both preparation methods resulted in anatase titania films with similar optical and electronic properties but considerably different film morphologies. Spray pyrolysis resulted in dense TiO2 films grown onto and affected by the surface roughness of the underlying conducting glass substrates. The spin-casting preparation procedure resulted in nanoporous titania films. Hybrid solar cell devices with varying layer thickness of the small-molecule semiconducting dye TDCV-TPA were investigated. Devices built with spray-pyrolyzed titania substrates yielded conversion efficiencies up to 0.47%. Spin-cast titania substrates exhibited short circuits for thin dye layer thickness. For thicker dye layers the performance of these devices was up to 0.6% due to the higher interfacial area for charge separation of these nanoporous TiO2 substrates.
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2.
  • Unger, Eva, et al. (author)
  • Spray-pyrolyzed vs spin-cast titania films in bilayer hybrid solar cells with a small-molecular hole transporting dye
  • Other publication (other academic/artistic)abstract
    • Titania films as acceptor layer in bilayer hybrid solar cell devices were prepared by spray-pyrolysis and by spin-casting. Both preparation methods resulted in anatase titania films with similar optical and electronic properties. Spray pyrolysis resulted in dense TiO2 films grown onto the conducting glass substrates while spin-casting gave rise to titania films with a nanoporous morphology. Hybrid solar cell devices with varying layer thickness of the small molecular semiconducting dye TDCV-TPA were investigated. Devices built with spray-pyrolyzed titania substrates yielded conversion effiencies up to 0.47 %, limited by the exciton diffusion length in TDCV-TPA. Spin-cast titania substrates exhibited short circuits for devices with thin dye layer thickness but gave up to 0.6 % conversion efficiency for thicker dye layers due to the higher interfacial area for charge separation and the dye acting as an insultator.
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