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Semimetallic features in thermoelectric transport properties of 2H-3R phase niobium diselenide

Title
Semimetallic features in thermoelectric transport properties of 2H-3R phase niobium diselenide
Authors
Moon, HongjaeKim, JeongminBang, JoonhoHong, SeokkyoonYoun, SeonhyeShin, HyunjunRoh, Jong WookShim, WooyoungLee, Wooyoung
DGIST Authors
Kim, Jeongmin
Issue Date
2020-12
Citation
Nano Energy, 78, 105197
Type
Article
Article Type
Article
Author Keywords
PolymorphNiobium diselenideElectrical conductivitySeebeck coefficientThermoelectricityEnergy harvesting
Keywords
Gate dependenceInterlayer stackingMetallic transportPolymorphic formsEnergy harvestingTheoretical calculationsThermoelectric transport propertiesTransport behaviorVan der waalsCrystal symmetryNiobium compoundsSelenium compoundsVan der Waals forces
ISSN
2211-2855
Abstract
In two-dimensional van der Waals crystals, the interlayer stacking sequence often leads to a change in crystal symmetry and, thus, new polymorphs, leading to an abundant array of physical properties. In this paper, we report the polymorphic form of 2H–3R–NbSe2 that exhibits a substantial difference in terms of the gate dependence of semimetallic behavior and Seebeck coefficient, compared to the well-known 2H–NbSe2 with metallic transport behavior. The semimetallic features of 2H–3R–NbSe2 indicate the presence of minor carriers, confirmed through theoretical calculations, which is in good agreement with the transport behavior. Our results reveal perspectives for understanding the metastable 2H–3R phase NbSe2, which is not far from equilibrium, and for engineering the materials necessary for efficient energy harvesting. © 2020 Elsevier Ltd
URI
http://hdl.handle.net/20.500.11750/12533
DOI
10.1016/j.nanoen.2020.105197
Publisher
Elsevier BV
Related Researcher
  • Author Kim, Jeongmin  
  • Research Interests Thermoelectric Materials / Nano Materials / Charge and Heat Transport Phenomena / Transport Measurement in Low-dimensional Materials
Files:
There are no files associated with this item.
Collection:
Division of Nanotechnology1. Journal Articles


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