Strong Thermopower Enhancement and Tunable Power Factor via Semimetal to Semiconductor Transition in a Transition-Metal Dichalcogenide

Hongjae Moon, Joonho Bang, Seokkyoon Hong, Gwansik Kim, Jong Wook Roh, Jeongmin Kim, Wooyoung Lee

Research output: Contribution to journalArticle

Abstract

Electronic band engineering is a promising approach to enhance the thermopower of thermoelectric materials. In transition-metal dichalcogenides (TMDCs), this has so far only been achieved using their inherent semiconducting nature. Here, we report the thickness-modulated band engineering of nanosheets based on semimetallic platinum diselenide (PtSe2) resulting in a thermopower enhancement of more than 50 times than that of the bulk. We obtained this by introducing a semimetal to semiconductor (SMSC) transition resulting in the formation of a bandgap. This approach based on semimetallic TMDCs provides potential advantages such as a large variation of transport properties, a decrease of the ambipolar transport effect, and a high carrier density dependence of the transport properties. Our observations suggest that the SMSC transition in TMDCs is a promising and straightforward strategy for the development of two-dimensional nanostructured thermoelectric materials.

Original languageEnglish
Pages (from-to)13317-13324
Number of pages8
JournalACS Nano
Volume13
Issue number11
DOIs
Publication statusPublished - 2019 Nov 26

Fingerprint

Metalloids
metalloids
Thermoelectric power
Transition metals
thermoelectric materials
transition metals
Semiconductor materials
Transport properties
augmentation
transport properties
engineering
Nanosheets
Electron transitions
Platinum
Carrier concentration
Energy gap
platinum
electronics

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Moon, Hongjae ; Bang, Joonho ; Hong, Seokkyoon ; Kim, Gwansik ; Roh, Jong Wook ; Kim, Jeongmin ; Lee, Wooyoung. / Strong Thermopower Enhancement and Tunable Power Factor via Semimetal to Semiconductor Transition in a Transition-Metal Dichalcogenide. In: ACS Nano. 2019 ; Vol. 13, No. 11. pp. 13317-13324.
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Strong Thermopower Enhancement and Tunable Power Factor via Semimetal to Semiconductor Transition in a Transition-Metal Dichalcogenide. / Moon, Hongjae; Bang, Joonho; Hong, Seokkyoon; Kim, Gwansik; Roh, Jong Wook; Kim, Jeongmin; Lee, Wooyoung.

In: ACS Nano, Vol. 13, No. 11, 26.11.2019, p. 13317-13324.

Research output: Contribution to journalArticle

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