Enhanced thermoelectric properties of SnSe thin films grown by pulsed laser glancing-angle deposition

Chun Hung Suen, Dongliang Shi, Y. Su, Zhi Zhang, Cheuk Ho Chan, Xiaodan Tang, Y. Li, Kwok Ho Lam, Xinxin Chen, B. L. Huang, X. Y. Zhou, Jiyan Dai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)

Abstract

In this work, we demonstrate a grain size control method in growing nanocrystalline SnSe thin films through a glancing angle pulsed-laser deposition approach. Structural characterization reveals that the SnSe film deposited at a normal angle has a preferred orientation along a axis, while by contrast, the SnSe film deposited at an 80° glancing angle develops a nanopillar structure with the growth direction towards the incident atomic flux. The glancing angle deposition greatly reduces the grain size of the thin film due to a shadowing effect to the adatoms, resulting in significantly increased power factor for more than 100%. The maximum Seebeck coefficient and power factor are 498.5μV/K and 18.5μWcm−1K−2, respectively. The enhancement of thermoelectric property can be attributed to the potential barrier scattering at grain boundaries owing to the reduced grain size and increased grain boundaries in the film. Given this enhanced power factor, and considering the fact that the nanopillar structure should have much lower thermal conductivity than a plain film, the zT value of such made SnSe film could be significantly larger than the corresponding single crystal film, making it a good candidate for thin film-based thermoelectric device.
Original languageEnglish
Pages (from-to)293-298
Number of pages6
JournalJournal of Materiomics
Volume3
Issue number4
DOIs
Publication statusPublished - 1 Dec 2017

Keywords

  • Glancing angle
  • Potential barrier scattering
  • SnSe
  • Thermoelectric

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Metals and Alloys

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