Highly Suppressed Thermal Conductivity in Diamond-like Cu2SnS3by Dense Dislocation

Chao Li, Haili Song, Yan Cheng, Ruijuan Qi, Rong Huang, Chengqiang Cui, Yifeng Wang, Yu Zhang, Lei Miao

Research output: Contribution to journalArticlepeer-review

Abstract

Cu2SnS3 is a promising low-cost and eco-friendly thermoelectric material. However, its rigid diamond crystal structure leads to a high thermal conductivity and hence its overall poor thermoelectric properties. Here we show Ni doping at the Sn site can introduce a dense dislocation of density of ∼4.83 × 109 cm-2 to Cu2SnS3. The abundant dislocations generate a large strain within the matrix, which effectively scatters heat-carrying phonons. The resultant lowest κlatt reaches ∼0.41 W m-1 K-1 at 723 K, approaching the theoretical limit (0.30 W m-1 K-1). The regulation strategy on dislocations is expected to reduce the thermal conductivity and improve the functionalities of other diamond-like materials.

Original languageEnglish
Pages (from-to)8728-8733
Number of pages6
JournalACS Applied Energy Materials
Volume4
Issue number9
DOIs
Publication statusPublished - 2021 Sep 27

Keywords

  • CuSnS
  • diamond-like structure
  • dislocations
  • lattice thermal conductivity
  • phonon scattering

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Electrical and Electronic Engineering
  • Materials Chemistry

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