Interfacial energy band and phonon scattering effect in Bi2Te3-polypyrrole hybrid thermoelectric material

We 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 materi...

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Veröffentlicht in:Applied physics letters 2018-10, Vol.113 (15)
Hauptverfasser: Kim, Cham, Baek, Ju Young, Lopez, David Humberto, Kim, Dong Hwan, Kim, Hoyoung
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container_title Applied physics letters
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creator Kim, Cham
Baek, Ju Young
Lopez, David Humberto
Kim, Dong Hwan
Kim, Hoyoung
description We 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 ∼ 0.98 at 25 °C, ZTmax ∼ 1.21 at 100 °C, and ZTave ∼ 1.18 at 50–150 °C) that exceed those of most of the previously reported n-type Bi2Te3 or Bi2(Te,Se)3 materials.
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Applied physics
Bismuth tellurides
Conducting polymers
Decoupling
Electrical resistivity
Interfacial energy
Machine tool industry
Photovoltaic cells
Polypyrroles
Power factor
Scattering
Seebeck effect
Thermal conductivity
Thermodynamic properties
Thermoelectric materials
title Interfacial energy band and phonon scattering effect in Bi2Te3-polypyrrole hybrid thermoelectric material
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