期刊
NATURE MATERIALS
卷 13, 期 2, 页码 190-194出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nmat3824
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资金
- European Research Council (ERC) [307596]
- Swedish foundation for strategic research
- Knut and Alice Wallenberg foundation
- Swedish Energy Agency
- Advanced Functional Materials Center at Linkoping University
- European Commission and Region Wallonne (FEDER 'Revetements Fonctionnels' programme)
- BELSPO [IAP 7/05]
- OPTI2MAT Excellence program of Region Wallonne
- FNRS-FRFC
- ITEK
- commercialization company for UniSA
- Norwegian Research Council
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.
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