Intrinsic defect formation and the effect of transition metal doping on transport properties in a ductile thermoelectric material α-Ag2S: a first-principles study

Ho Ngoc Nam, Ryo Yamada, Haruki Okumura, Tien Quang Nguyen, Katsuhiro Suzuki, Hikari Shinya, Akira Masago, Tetsuya Fukushima, Kazunori Sato

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, the electronic structure and transport properties of a ductile thermoelectric material α-Ag2S are examined using first-principles calculations combined with the Boltzmann transport equation within a constant relaxation-time approximation. The use of the exchange-correlation functional SCAN + rVV10 successfully describes the geometric and electronic structure of α-Ag2S with a direct bandgap value of 0.99 eV, which is consistent with the previous experimental observations. Based on the calculations of the formation energy of typical intrinsic defects, it is found that intrinsic defect formation greatly affects the conductivity of the system where silver vacancy and interstitial silver act as p-type and n-type defects, respectively. Large Seebeck coefficients at room-temperature, of around −760 μV K−1for n-type and 1400 μV K−1for p-type, are realized. It is also suggested that the doping of fully filledd-block elements such as Cu and Au not only maintained the Seebeck coefficients at high values but also improved electrical conductivity by more than 1.4 times, leading to the improvement of the power factor by up to 40% compared to the non-doped sample at low carrier concentration.

Original languageEnglish
Pages (from-to)9773-9784
Number of pages12
JournalPhysical Chemistry Chemical Physics
Volume23
Issue number16
DOIs
Publication statusPublished - 2021 Apr 28

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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