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 journalArticlepeer-review

31 Citations (Scopus)

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

Bibliographical note

Publisher Copyright:
© 2019 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy

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