Journal of Electronic Materials

, Volume 45, Issue 11, pp 5540–5545 | Cite as

Improvement in Thermoelectric Properties by Tailoring at In and Te Site in In2Te5

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Abstract

We study the role of substitutions at In and Te site in the thermoelectric behavior of In2Te5. Single crystals with compositions In2(Te1−xSex)5 (x = 0, 0.05, 0.10) and Fe0.05In1.95(Te0.90Se0.10)5 were prepared using a modified Bridgman–Stockbarger technique. Electrical and thermal transport properties of these single crystals were measured in the temperature range of 6 K to 395 K. A substantial decrease in the thermal conductivity was observed in Fe-substituted samples, attributed to enhanced phonon scattering at point defects. Marked enhancement in the Seebeck coefficient S along with concomitant suppression of the electrical resistivity ρ was observed in Se-substituted single crystals. An overall enhancement of the thermoelectric figure of merit (zT) by a factor of 310 was observed in single-crystal Fe0.05In1.95(Te0.90Se0.10)5 compared with single crystals of the parent material In2Te5.

Keywords

Thermoelectric thermal conductivity electrical conductivity Seebeck coefficient figure of merit single crystal 

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Copyright information

© The Minerals, Metals & Materials Society 2016

Authors and Affiliations

  • Anup V. Sanchela
    • 1
  • Ajay D. Thakur
    • 2
    • 3
  • C. V. Tomy
    • 1
  1. 1.Department of PhysicsIndian Institute of Technology BombayMumbaiIndia
  2. 2.School of Basic SciencesIndian Institute of Technology PatnaPatnaIndia
  3. 3.Centre for Energy and EnvironmentIndian Institute of Technology PatnaPatnaIndia

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