Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 49, Pages 42310-42319Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b15252
Keywords
PEDOT:PSS; copper telluride; tellurium; thermoelectric; flexible
Funding
- Key Program of National Natural Science Foundation of China [5163210]
- National Basic Research Program of China (973 Program) [2013CB632500]
- foundation of the State Key Lab of Advanced Technology for Material Synthesis and Processing (Wuhan University of Technology), Innovation Commission of Shenzhen Municipality [KQCX2015033110182370, KQTD2016022619565991]
- National Natural Science Foundation of China [51473052, 61611530550]
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In this work, Te/poly(3,4-ethylenedioxythiophene) (PEDOT):poly(styrenesulfonate) (PSS)/Cu7Te4 ternary thermoelectric (TE) nanocomposite films were successfully fabricated by physical mixing and then drop casting. An optimum power factor of 65.3 mu W/mK(2) was acquired from a composite film containing 95 wt % PEDOT:PSS-coated Te (PC/Te) nanorods at 300 K, which was about 5 times as large as that of the PC/Cu7Te4 nanorod film and about 3 times as large as that of the PC/Te nanorod film. The power factor reached 112.3 mu W/mK(2) when the temperature was 380 K. Scanning transmission electron microscopy (STEM) and high-resolution STEM were used to observe the detailed internal microstructure of the composite film, revealing that the Te nanorods were single crystalline and the Cu7Te4 rods polycrystalline. The composite film was in fact a three-dimensional network interconnected with the PC/Te and PC/Cu7Te4 nanorods. The enhancement of the TE properties was ascribed to the synergetic effect of the two kinds of nanorods and the double-carrier filtering effect at the two heterointerfaces of Te/PEDOT:PSS and Cu7Te4/PEDOT:PSS. An eight single-leg flexible TE device consisting of the optimized composite film was fabricated, which produced a voltage of 31.2 mV and a maximum output power of 94.7 nW at a temperature gradient of 39 K.
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