Thermoelectric property studies on CuxBi2SeS2with nano-scale precipitates Bi2S3

L. Li, Y. Liu, Jiyan Dai, H. X. Zhu, A. J. Hong, X. H. Zhou, Z. F. Ren, J. M. Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

21 Citations (Scopus)

Abstract

The microscopic mechanisms for higher thermoelectric performance of cost competitive rock salt compound Bi2SeS2were investigated. A low doping of Cu as an n-type dopant was conducted in order to optimize the band structure and improve the electrical conductivity. It was revealed that this compound exhibits a Seebeck coefficient higher than 300μVK-1, which sustains above 100μVK-1even with Cu doping, leading to a higher power factor. The microstructural characterizations revealed nano-scale Bi2S3precipitates in the CuxBi2SeS2matrix, beneficial to the lower lattice thermal conductivity that is insensitive to the Cu doping. A thermoelectric figure-of-merit factor ZT of ~0.7 at 450°C in accompanying with the power factor of ~5.36μWcm-1K-2was obtained under the optimized doping level, enabling this environmentally friendly compound interesting for thermoelectric power generation applications.
Original languageEnglish
Pages (from-to)447-456
Number of pages10
JournalNano Energy
Volume12
DOIs
Publication statusPublished - 1 Mar 2015

Keywords

  • Bi SeS 2 2
  • Cu doping
  • Nano-scale Bi S precipitates 2 3
  • Thermoelectric

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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