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Morphological characteristics in polycrystalline tungsten diselenide regulating transport properties lead to predominant thermoelectric performance

Title
Morphological characteristics in polycrystalline tungsten diselenide regulating transport properties lead to predominant thermoelectric performance
Authors
Kim, Cham.Baek, Ju YoungKim, Dong HwanKim, Jong TaeLopez, David HumbertoKim, TaewookKim, Hoyoung
DGIST Authors
Kim, Cham.Kim, Dong HwanKim, Hoyoung
Issue Date
2017
Citation
Journal of Alloys and Compounds, 722, 183-189
Type
Article
Article Type
Article
Keywords
Electrical ConductivityFigure of MeritThermal ConductivityThermo ElectricityTungsten Diselenide
ISSN
0925-8388
Abstract
We studied a polycrystalline p-type WSe2 semiconductor for thermoelectric applications. The polycrystalline WSe2 nanocompound was prepared via a thermal reaction process of tungsten and selenium elements and it was sintered to produce a bulk structure using spark plasma sintering equipment. The resulting bulk specimen showed different morphological aspects, in which we observed irregularly-shaped grains along the direction perpendicular to the sintering pressing direction (i.e., along transversal direction) while finding thin layers along the parallel direction (i.e., along longitudinal direction). The specimen recorded a significantly low longitudinal thermal conductivity possibly because longitudinal phonon transport should be hindered due to the thin layers. Electron transport along the longitudinal direction might not be greatly interrupted by the morphological characteristics because the specimen recorded high carrier mobility along the direction resulting in lower electrical resistivity than that of a single crystalline equivalent. The specimen also showed moderate carrier concentration, which led to a plausible Seebeck coefficient. Since the specimen exhibited the significantly low thermal conductivity with the electrical properties, it recorded a higher figure of merit than the equivalent, which is the highest thermoelectric performance for p-type WSe2 in bulk phase ever developed. © 2017 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/5037
DOI
10.1016/j.jallcom.2017.06.074
Publisher
Elsevier Ltd
Related Researcher
Files:
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Collection:
Magnet-Controlled Materials Research Group1. Journal Articles


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