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Thermoelectric enhancement in multilayer thin-films of tin chalcogenide nanosheets/conductive polymers

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Abstract

Te-Substituted SnSe nanosheets (Te-s-SnSe NSs) with a lateral size of ∼500 nm are fabricated and their surfaces are then coated with a poly(3,4-ethylenedioxythiophene) PEDOT nanolayer. The 3,4-ethylenedioxythiophene loading is optimized for achieving outstanding thermoelectric performance and the resulting PEDOT-coated nanosheets (PEDOT-Te-s-SnSe NSs) are alternately stacked with PEDOT:poly(styrenesulfonate) (PSS) using a solution-processable method to obtain multilayer inorganic/organic composite films. The as-fabricated multilayer films exhibit outstanding electrical conductivity and Seebeck coefficient. This is due to the enhanced interchain interaction and charge-carrier hopping of the stretched PEDOT chains as well as the presumable energy-filtering effect at the interfacial potential barriers between inorganic and organic layers. The multilayer film consisting of three-repeated stacking allows a maximum thermoelectric power factor of 222 μW m−1 K−2, which is 5.5 times larger than that achieved with pristine PEDOT:PSS. This strategy of combining inorganic and organic materials into multilayer films is promising for the achievement of high-performance thin-film thermoelectrics.

Graphical abstract: Thermoelectric enhancement in multilayer thin-films of tin chalcogenide nanosheets/conductive polymers

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Publication details

The article was received on 03 Jun 2019, accepted on 01 Aug 2019 and first published on 02 Aug 2019


Article type: Paper
DOI: 10.1039/C9NR04712C
Nanoscale, 2019, Advance Article

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    Thermoelectric enhancement in multilayer thin-films of tin chalcogenide nanosheets/conductive polymers

    H. Ju, D. Park and J. Kim, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR04712C

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