Semi-metallic polymers

Olga Bubnova, Zia Ullah Khan, Hui Wang, Slawomir Braun, Drew R. Evans, Manrico Fabretto, Pejman Hojati-Talemi, Daniel Dagnelund, Jean-Baptiste Arlin, Yves H. Geerts, Simon Desbief, Dag Werner Breiby, Jens Wenzel Andreasen, Roberto Lazzaroni, Weimin M. Chen, Igor Zozoulenko, Mats Fahlman, Peter J. Murphy, Magnus Berggren, Xavier Crispin

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Abstract

Polymers are lightweight, flexible, solution-processable materials that are promising for low-cost printed electronics as well as for mass-produced and large-area applications. Previous studies demonstrated that they can possess insulating, semiconducting or metallic properties; here we report that polymers can also be semi-metallic. Semi-metals, exemplified by bismuth, graphite and telluride alloys, have no energy bandgap and a very low density of states at the Fermi level. Furthermore, they typically have a higher Seebeck coefficient and lower thermal conductivities compared with metals, thus being suitable for thermoelectric applications. We measure the thermoelectric properties of various poly( 3,4-ethylenedioxythiophene) samples, and observe a marked increase in the Seebeck coefficient when the electrical conductivity is enhanced through molecular organization. This initiates the transition from a Fermi glass to a semi-metal. The high Seebeck value, the metallic conductivity at room temperature and the absence of unpaired electron spins makes polymer semi-metals attractive for thermoelectrics and spintronics.
Original languageEnglish
JournalNature Materials
Volume13
Issue number2
Pages (from-to)190-194
Number of pages5
ISSN1476-1122
DOIs
Publication statusPublished - 2014

Keywords

  • CHEMISTRY,
  • MATERIALS
  • PHYSICS,
  • HIGHLY CONDUCTING POLYANILINE
  • VAPOR-PHASE POLYMERIZATION
  • ELECTRICAL-CONDUCTIVITY
  • HOPPING TRANSPORT
  • METAL TRANSITION
  • FERMI GLASS
  • THIN-FILMS
  • POLY(3,4-ETHYLENEDIOXYTHIOPHENE)
  • PEDOT
  • POLYTHIOPHENE
  • Bismuth alloys
  • Electric properties
  • Glass transition
  • Seebeck coefficient
  • Semiconducting polymers
  • Thermal conductivity
  • Thermoelectricity
  • Electrical conductivity
  • Metallic conductivity
  • Metallic properties
  • Molecular organization
  • Poly-3 ,4-ethylenedioxythiophene
  • Printed electronics
  • Thermoelectric application
  • Thermoelectric properties
  • Polymers

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