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Sökning: WAKA:ref > Inganäs Olle > Zhang Fengling 1960 > Gadisa Abay 1972 > Tidskriftsartikel

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  • Jespersen, Kim G, et al. (författare)
  • Charge formation and transport in bulk-heterojunction solar cells based on alternating polyfluorene copolymers blended with fullerenes
  • 2006
  • Ingår i: Organic electronics. - 1566-1199. ; 7, s. 235-242
  • Tidskriftsartikel (refereegranskat)abstract
    • We investigate charge formation in bulk-heterojunction solar cells based on conjugated polymers in the form of alternating polyfluorene copolymers and the methanofullerene PCBM. Using transient absorption spectroscopy we show that optimal charge formation is obtained with 20-50 wt% PCBM. This is in contrast to the maximum short circuit current density obtained at similar to 80 wt% PCBM as determined by steady state current density-voltage characterization. Hence, we show explicitly that the solar cell performance of these interpenetrating polymer networks containing PCBM is limited by charge transport rather than by formation of charges. (c) 2006 Elsevier B.V. All rights reserved.
  • Mammo, W., et al. (författare)
  • New low band gap alternating polyfluorene copolymer-based photovoltaic cells
  • 2007
  • Ingår i: Solar Energy Materials and Solar Cells. - 0927-0248. ; 91:11, s. 1010-1018
  • Tidskriftsartikel (refereegranskat)abstract
    • New low band gap alternating polyfluorene copolymers were synthesized for use in plastic solar cells and their optical, electrochemical, and photovoltaic characteristics were determined. These polymers incorporated fluorene units alternating with groups including electron-withdrawing (A) and electron-donating (D) groups in donor-acceptor-donor (DAD) sequence to achieve the lowering of band gaps. The HOMO-LUMO values were estimated from electrochemical studies. By varying the donor and acceptor strength and position of the solubilizing substituents, similar HOMO values were obtained. These values were also found to correlate well with the open circuit voltage (VOC) values determined from photovoltaic data of the polymers blended with the acceptor PCBM. Despite similar HOMO values, the absorption spectra of the polymers differ significantly. This prompted the preparation of photovoltaic devices consisting of blends of two polymers with complementary absorptions in combination with PCBM to harvest more photons in the polymer solar cells. © 2007 Elsevier B.V. All rights reserved.
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Inganäs, Olle, 1951- ... (3)
Mammo, W., (2)
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