Journal
NANO ENERGY
Volume 18, Issue -, Pages 306-314Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2015.10.012
Keywords
Thermoelectric; Flexible; Decoupling; Inorganic-organic composites; Cu-doped Bi2Se3 nanoplates
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Funding
- Air Force Office of Scientific Research Grant [FA 9550-13-1-0085]
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We report on the fabrication of flexible and freestanding n-type thermoelectric Cu intercalated Bi2Se3 nanoplatelet/Polyvinylidene Fluoride (PVDF) composite films. The optimized power factor and figure of merit (ZT) of the Cu0.1Bi2Se3 nanoplatelet/PVDF composites are 103 mu W m(-1) K-2 and 0.10 at 290 K, respectively, which are one of the highest values for n-type thermoelectric films. The mechanism by which the Seebeck coefficient and electrical conductivity can be partially decoupled is explained in details: PVDF can not only grantee the robust and flexibility but also create a high trap state by introducing the energy barrier at the organic/inorganic interface, thus a high level of Seebeck coefficient is maintained for the composite system while a remarkable improvement on electrical conductivity was achieved. The thermoelectric films show high mechanical durability with only a 13% decrease in performance after 5000 bending cycles (bending curvature 1/2 mm(-1)). The overall performance of the n-type thermoelectric films approaches the values required for efficient flexible thermoelectric power generators. (C) 2015 Elsevier Ltd. All rights reserved.
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