Bharti, Meetu and Singh, Ajay and Saini, Gajender and Saha, Sudeshna and Bohra, Anil and Kaneko, Yuki and Debnath, A. K. and Muthe, K. P. and Marumoto, Kazuhiro and Aswal, D. K. and Gadkari, S. C. (2019) Boosting thermoelectric power factor of free-standing Poly (3,4ethylenedioxythiophene):polystyrenesulphonate films by incorporation of bismuth antimony telluride nanostructures. Journal of Power Sources, 435. pp. 226758-226769. ISSN 0378-7753

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Abstract

We demonstrate that introduction of p-type Bi0.5Sb1.5Te3 nanostructures into the polymer matrix not only causes highly adherent drop-casted films of PEDOT:PSS (on Kapton sheets) to attain a free-standing nature but also brings a significant improvement in their thermoelectric properties. Hall and ESR measurements of these hybrid films clearly show that both the carrier concentration and mobility can be varied with Bi0.5Sb1.5Te3 content. Whereas, results of X-ray diffraction, Raman and X-ray photoelectron spectroscopy confirm the enhancement in chain alignment and better connectivity among PEDOT:PSS and Bi0.5Sb1.5Te3 nanosheets; leading to remarkable enhancement of electrical conductivity. These hybrid films, due to energy filtering of charge carriers at the organic/inorganic interface, exhibit improvement in the Seebeck coefficient also. In fact, such a synergetic combination of improved electrical conductivity and Seebeck coefficient expertly tailors the power factor (from order of similar to 10(-4) to 8.3 mu W/mK(2)) over a vast range. The optimized films are tested for their power conversion ability and a single thermoelement based device exhibits an open circuit voltage similar to 536 mu V and current similar to 134 mu A for a temperature difference of 53 degrees C. Such an evolution of organic-inorganic hybrid films in a flexible, free-standing motif with enhanced thermoelectric properties exhibit good potential for recovering heat from the curved hot surfaces.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Electrochemistry Energy Fuels Materials Science Physical Chemistry/Chemical Physics
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	31 Jan 2020 08:46
Last Modified:	31 Jan 2020 08:46
URI:	http://npl.csircentral.net/id/eprint/4118

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