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Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four important thermodynamic potentials are internal energy, enthalpy, Helmholtz free energy, and Gibbs free energy. These thermodynamic potentials can be expressed using two of the following variables: pressure, volume, temperature, and entropy. These two variables are expressed as the rate of change of the thermodynamic potential with respect to other...
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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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Doping Achieves High Thermoelectric Performance in SnS: A First-Principles Study.

Zhi Li1, Xianli Su1, Xinfeng Tang1

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.

ACS Applied Materials & Interfaces
|January 26, 2022
PubMed
Summary

Tin sulfide (SnS) shows potential as a thermoelectric material due to its low cost and abundance. This study reveals optical phonons dominate heat transport and limit charge mobility in SnS, enabling a high thermoelectric figure of merit (ZT) of 1.68.

Keywords:
defect calculationsdopingoptical phononsthermoelectrictransport properties

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Tin sulfide (SnS) is recognized as a cost-effective, earth-abundant, and environmentally friendly thermoelectric material.
  • Despite its promise, theoretical analyses of charge and heat transport mechanisms in SnS remain limited.
  • Optimizing SnS thermoelectric performance requires a deeper understanding of its fundamental transport properties.

Purpose of the Study:

  • To investigate the underlying mechanisms of charge and heat transport in SnS.
  • To elucidate the role of optical phonons in thermal conductivity and electrical resistivity.
  • To identify optimal doping strategies for enhancing SnS thermoelectric performance.

Main Methods:

  • Calculated lattice thermal conductivity (κL) and identified dominant heat-carrying phonon modes.
  • Employed nonempirical carrier lifetime calculations to assess charge transport properties.
  • Performed defect calculations to screen potential dopants and predict optimal doping conditions.

Main Results:

  • Discovered an unusual optical-phonon-dominated lattice thermal conductivity (κL) in SnS, with high-velocity optical phonons arising from antiphase sublayer movements.
  • Confirmed the significant role of optical phonons in limiting carrier mobility, impacting electrical transport.
  • Predicted a maximum thermoelectric figure of merit (ZT) of 1.68 at 850 K for p-type SnS with a hole concentration of 5.5 × 1019 cm-3, achievable without band engineering.
  • Screened 11 dopants, identifying Na, K, Tl, and Ag as effective in increasing hole concentration, with Na being the most promising.
  • Suggested optimal synthesis conditions: sulfur-excess environment and temperatures above 1353 K for maximizing dopant effectiveness.

Conclusions:

  • Optical phonons play a critical dual role in SnS, dominating heat transport and limiting charge mobility.
  • p-type SnS can achieve high thermoelectric performance (ZT ≈ 1.68) through intrinsic properties and strategic doping.
  • Na, K, and Tl are identified as promising dopants for SnS, with specific synthesis conditions recommended for optimal results, paving the way for rational material design.