The chemical and electronic structure of the interface between aluminum and polythiophene semiconductors

DOI PDF 被引用文献2件
  • P. Dannetun
    Department of Physics, IFM, Linköping University, S-58183 Linköping, Sweden
  • M. Boman
    Department of Physics, IFM, Linköping University, S-58183 Linköping, Sweden
  • S. Stafström
    Department of Physics, IFM, Linköping University, S-58183 Linköping, Sweden
  • W. R. Salaneck
    Department of Physics, IFM, Linköping University, S-58183 Linköping, Sweden
  • R. Lazzaroni
    Service de Chimie des Matériaux Nouveaux, Département des Matériaux et Procédés, Université de Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium
  • C. Fredriksson
    Service de Chimie des Matériaux Nouveaux, Département des Matériaux et Procédés, Université de Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium
  • J. L. Brédas
    Service de Chimie des Matériaux Nouveaux, Département des Matériaux et Procédés, Université de Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium
  • R. Zamboni
    Istituto di Spettroscopia Molecolare, CNR, Via dè Castagnoli 1, I-40126 Bologna, Italy
  • C. Taliani
    Istituto di Spettroscopia Molecolare, CNR, Via dè Castagnoli 1, I-40126 Bologna, Italy

書誌事項

公開日
1993-07-01
DOI
  • 10.1063/1.466217
公開者
AIP Publishing

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説明

<jats:p>We have investigated the chemical nature and the electronic structure of the interface between a low work function metal, aluminum, and a conjugated polymer semiconductor, polythiophene. We have studied the initial stages of the interface formation by depositing the metal onto the surface of a polymer film. Charge transfer processes between the metal and the polymer are analyzed using core-level x-ray photoelectron spectroscopy (XPS); the evolution upon metallization of the valence electronic levels directly related to the polymer electronic structure is followed with ultraviolet photoelectron spectroscopy (UPS). With these techniques, we investigate the deposition of aluminum on two polythiophene systems (i) the alkyl-substituted poly-3-octylthiophene and (ii) the α-sexithiophene oligomer. The experimental data are compared to the results of a recent quantum chemical study on model systems consisting of thiophene oligomers (up to sexithiophene) interacting with a few Al atoms. The interaction of polythiophene with Al atoms is found to modify dramatically the structure of the conjugated backbone, as strong carbon–aluminum bonds are formed in the α positions of the thiophene rings. A large charge transfer takes place from the Al atoms to the polymer chain, and the upper π levels of the polymer are strongly affected. The metallization is contrasted to the doping of conjugated polymers with alkali metals.</jats:p>

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