par Bubnova, Olga;Khan, Zia Ullah;Wang, Hui;Braun, Slawomir;Evans, Drew;Fabretto, Manrico;Hojati-Talemi, Pejman;Dagnelund, Daniel;Arlin, Jean-Baptiste 
;Geerts, Yves ;Desbief, Simon;Breiby, Dag W.;Andreasen, Jens W.;Lazzaroni, Roberto;Chen, Weimin W.M.;Zozoulenko, Igor;Fahlman, Mats;Murphy, Peter P.J.;Berggren, Magnus;Crispin, Xavier
Référence Nature materials, 13, 2, page (190-194)
Publication Publié, 2014
;Geerts, Yves ;Desbief, Simon;Breiby, Dag W.;Andreasen, Jens W.;Lazzaroni, Roberto;Chen, Weimin W.M.;Zozoulenko, Igor;Fahlman, Mats;Murphy, Peter P.J.;Berggren, Magnus;Crispin, XavierRéférence Nature materials, 13, 2, page (190-194)
Publication Publié, 2014
Article révisé par les pairs
| Résumé : | 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. © 2014 Macmillan Publishers Limited. All rights reserved. |
