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Sökning: WAKA:ref > Inganäs Olle > Tidskriftsartikel > Jonforsen M.

  • Resultat 1-6 av 6
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1.
  • Ding, L., et al. (författare)
  • Photovoltaic cells with a conjugated polyelectrolyte
  • 2000
  • Ingår i: Synthetic metals. - 0379-6779. ; 110:2, s. 133-140
  • Tidskriftsartikel (refereegranskat)abstract
    • We describe photovoltaic cells made from a novel conjugated polyelectrolyte, the lithium salt of poly(thiophene-3-acetic acid) (PTAA-Li). The aqueous solubility of this polyelectrolyte allows formation of blend electrodes with a dispersion of the metallic polymer Poly(Ethylene DiOxyThiophene) (PEDOT). The incident monochromatic photon to current conversion efficiency (IPCE) of the cells were improved up to 19% by blending PTAA-Li with PEDOT to modify the ITO electrode, in combination with the low bandgap polymer poly(3-(4-octylphenyl)thiophene) (POPT), and C60 as electron acceptor. We attribute the increase of efficiency to the improved contact area between the conjugated polyelectrolyte and PEDOT.
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2.
  • Gillissen, S, et al. (författare)
  • Synthesis and characterization of poly(pyridine vinylene) via the sulfinyl precursor route
  • 2001
  • Ingår i: Macromolecules. - 0024-9297. ; 34:21, s. 7294-7299
  • Tidskriftsartikel (refereegranskat)abstract
    • The synthesis and characterization of poly(pyridine vinylene) (PPyV) via the nonionic sulfinyl precursor route is presented. Starting from an unsymmetrical monomer, precursor polymers were prepared in various solvents, which led to polymers with variable molecular weights. The thermal conversion to the conjugated structure, as well as its stability, was studied with different techniques such as FT-IR, UV-vis, TGA, and direct insertion probe mass spectroscopy (DIP-MS). From these results we were able to derive the most suitable conditions to perform the conversion. The fully conjugated PPyV was further characterized with photoluminescence (PL) and cyclic voltammetry (CV) measurements. The PL efficiency was found to be as high as 14%. The CV measurements showed that the polymer can be reduced (n-doped).
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3.
  • Jonforsen, M., et al. (författare)
  • Photodiodes made from poly(pyridopyrazine vinylene) : polythiophene blends
  • 2001
  • Ingår i: Synthetic metals. - 0379-6779. ; 119:1-3, s. 185-186
  • Tidskriftsartikel (refereegranskat)abstract
    • A PPV-type polymer with the pyridopyrazine heterocycle (EHH-PPyPzV) has been synthesised and found to have high electron affinity according to electrochemical measurements. When used as the electron accepting material in single-layer-photodiodes, with a thiophene copolymer (PEOPT-co-PAAPT) as the electron donating material, IPCE (incident photon to current conversion efficiency) up to 1% was measured. Atomic force microscopy was used to analyse the blend morphology in the devices.
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4.
  • Jonforsen, M., et al. (författare)
  • Synthesis and characterization of poly(quinoxaline vinylene)s and poly(pyridopyrazine vinylene)s with phenyl substituted side-groups
  • 2002
  • Ingår i: Synthetic metals. - 0379-6779. ; 131:1-3, s. 53-59
  • Tidskriftsartikel (refereegranskat)abstract
    • Poly(quinoxaline vinylene) and poly(pyridopyrazine vinylene) with 3(2'-ethylhexyloxy)phenyl side-groups have been synthesized and compared with similar polymers with purely aliphatic side-chains. The new polymers had smaller bandgaps, and from cyclic voltammetry it was seen that the phenyl substituted side-groups made the polymers easier to reduce, with half wave potentials of -1.02 and -1.33 V versus Ag/AgCl for the poly(pyridopyrazine vinylene) and poly(quinoxaline vinylene) respectively. The attachment of the phenyl substituted side-groups had counteracting effects on the stability towards photo-oxidation, which resulted in improved stability of the poly(pyridopyrazine vinylene) compared to its equivalent with purely aliphatic side-chains, while the poly(quinoxaline vinylene) showed decreased stability. © 2002 Elsevier Science B.V. All rights reserved.
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5.
  • Jonforsen, M, et al. (författare)
  • Synthesis and characterization of soluble and n-dopable poly(quinoxaline vinylene)s and poly(pyridopyrazine vinylene)s with relatively small band gap
  • 2002
  • Ingår i: Macromolecules. - 0024-9297. ; 35:5, s. 1638-1643
  • Tidskriftsartikel (refereegranskat)abstract
    • Synthesis and characterization of poly(quinoxaline vinylene)s and poly(pyridopyrazine vinylene)s with linear and branched aliphatic side chains are reported. The electron affinity of the polymers was measured with cyclic voltammetry (CV) and found to be highest for the pyridopyrazine vinylene polymers, Compared to CN-MEH-PPV, the pyridopyrazine vinylene polymers were easier to reduce, while the quinoxaline derivatives were harder. UV-vis absorption measurements showed that the polymers have relatively small band gaps.
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6.
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