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https://hdl.handle.net/2440/101985
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Type: | Journal article |
Title: | Semi-metallic polymers |
Author: | Bubnova, O. Khan, Z. Wang, H. Braun, S. Evans, D. Fabretto, M. Hojati-Talemi, P. Dagnelund, D. Arlin, J. Geerts, Y. Desbief, S. Breiby, D. Andreasen, J. Lazzaroni, R. Chen, W. Zozoulenko, I. Fahlman, M. Murphy, P. Berggren, M. Crispin, X. |
Citation: | Nature Materials, 2014; 13(2):190-194 |
Publisher: | Nature Publishing Group |
Issue Date: | 2014 |
ISSN: | 1476-1122 1476-4660 |
Statement of Responsibility: | 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 W. Breiby, Jens W. Andreasen, Roberto Lazzaroni, Weimin M. Chen, Igor Zozoulenko, Mats Fahlman, Peter J. Murphy, Magnus Berggren, Xavier Crispin |
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. |
Keywords: | Condensed-matter physics; electronic properties and materials; polymers |
Rights: | © 2014 Macmillan Publishers Limited. All rights reserved. |
DOI: | 10.1038/nmat3824 |
Published version: | http://dx.doi.org/10.1038/nmat3824 |
Appears in Collections: | Aurora harvest 3 Chemical Engineering publications |
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