Interfacial energy band and phonon scattering effect in Bi2Te3-polypyrrole hybrid thermoelectric material
AffiliationUniv Arizona, Dept Chem & Environm Engn
MetadataShow full item record
PublisherAMER INST PHYSICS
CitationAppl. Phys. Lett. 113, 153901 (2018); https://doi.org/10.1063/1.5050089
JournalAPPLIED PHYSICS LETTERS
Rights© 2018 Author(s).
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractWe hybridized n-type Bi2Te3 with an inexpensive and abundantly available conducting polymer, polypyrrole, to obtain a bulk-structured hybrid material in which the interfacial energy band and the phonon scattering effects should occur at the interface of the two components. The obtained hybrid material inevitably exhibited a lower electrical conductivity than pristine Bi2Te3, which may be attributable to carrier scattering at the interfacial energy barrier. However, the hybrid material completely compensated for this loss in electrical conductivity with a significant increase in the Seebeck coefficient, and thus it retained the power factor with no loss. In addition, the hybrid material displayed a much lower thermal conductivity than pristine Bi2Te3 owing to the phonon scattering effect. The hybrid material exhibited significant decoupling of the electrical and thermal properties, thus affording state-of-the-art figures of merit (ZT similar to 0.98 at 25 degrees C, ZT(max) similar to 1.21 at 100 degrees C, and ZT(ave) similar to 1.18 at 50-150 degrees C) that exceed those of most of the previously reported n-type Bi2Te3 or Bi-2(Te,Se)(3) materials. Published by AIP Publishing.
Note12 month embargo; published online: 8 October 2018
VersionFinal published version
SponsorsDGIST R&D Program of the Ministry of Science, ICT and Technology of Korea [18-ET-02, 18-01-HRMA-03]