Facile phase transition to β- from α-SnSe by uniaxial strain

Sun Kyung Cha, Seongil Im, Byungki Ryu, Yong Sung Kim

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We investigate the phase transition between uniaxially strained α- and β-SnSe using density functional theory calculations and suggest that uniaxial strain can enable a facile phase transition to the β phase. Increasing the interlayer spacing along the a-axis and, more effectively, applying compressive strain in the corrugated direction along the c-axis in α-SnSe are found to decrease the β-phase energy with respect to α. Where the phase transition temperature Tc of unconstrained SnSe is 800 K, the Tc of a-axis +2.6% tensile strained α-SnSe is estimated to be 600 K, while the Tc of c-axis −3.8% compressive strained α-SnSe is estimated to be 400 K. The uniaxial strain engineering can lower the optimal operation temperature of SnSe-based thermoelectric applications.

Original languageEnglish
Pages (from-to)45-52
Number of pages8
JournalCurrent Applied Physics
Publication statusPublished - 2023 Jan

Bibliographical note

Publisher Copyright:
© 2022 The Author(s)

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)


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