Nanomechanical properties and fracture toughness of Bi3Se2Te thin films grown using pulsed laser deposition

Phuoc Huu Le, Chih-Wei Luo, Sheng Rui Jian*, Ting Chun Lin, Ping Feng Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Mechanical properties of thermoelectric (TE) materials are crucial for fabricating efficient and endurable TE devices. In this study, polycrystalline Bi3Se2Te thin films are grown on c-plane sapphire substrates at 250 °C and helium gas pressure of 6.5 × 10−1 Torr using pulsed laser deposition (PLD). The structural, compositional, morphological and mechanical properties of Bi3Se2Te thin films are studied. The Bi3Se2Te thin films are highly c-axis oriented structure and exhibit the stoichiometric compositions of Bi3Se2Te phase. The hardness and Young's modulus of the Bi3Se2Te thin films are 5.6 ± 0.2 GPa and 197.2 ± 5.4 GPa, respectively, which determined by nanoindentation tests with the continuous stiffness measurement (CSM) mode. The true hardness of the Bi3Se2Te thin films is also calculated using the energy principle of nanoindentation contact. The micro-Vicker indentation-induced fracture behavior of the Bi3Se2Te thin films is observed and discussed.

Original languageEnglish
Pages (from-to)72-76
Number of pages5
JournalMaterials Chemistry and Physics
Volume182
DOIs
StatePublished - 1 Oct 2016

Keywords

  • Thin films
  • Nanoindentation
  • Mechanical properties
  • Fracture
  • ENHANCED THERMOELECTRIC PROPERTIES
  • MECHANICAL-PROPERTIES
  • ELASTIC-MODULUS
  • NANOINDENTATION
  • INDENTATION
  • HARDNESS
  • NANOCOMPOSITES
  • DEFORMATION
  • POLYANILINE
  • NANOWIRES

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