Volume 113, Number 4, February 2016
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||09 March 2016|
Tuning of thermoelectric properties with changing Se content in Sb2Te3
1 Department of Physics, University of Calcutta - 92 A P C Road, Kolkata-700009, India
2 Department of Physics, Vidyasagar Evening College - 39 Sankar Ghosh Lane, Kolkata-700006, India
3 Department of Physics, Raiganj University - Uttar Dinajpur 733134, India
4 Department of Low Temperature Physics and Superconductivity, Physics Faculty, M.V. Lomonosov Moscow State University - 119991, Moscow, Russia
5 UGC-DAE Consortium for Scientific Research, Kolkata Centre, Sector III, LB-8 - Salt Lake, Kolkata-700098, India
6 Surface and Nanoscience Division, Indira Gandhi Centre for Atomic Research - Kalpakkam 603102, India
7 Center for Research in Nanoscience and Nanotechnology, University of Calcutta, JD-2, Sector-III Salt Lake, Kolkata-700098, India
Received: 16 December 2015
Accepted: 24 February 2016
Polycrystalline Sb2Te3−xSex samples were synthesized by the solid-state reaction method. The structural analysis showed that up to the maximal concentration of Se, the samples possess rhombohedral crystal symmetry (space group ). The increase of Se content increases the resistivity of the samples. The variation of phonon frequencies, observed from the Raman spectroscopic study, depicts an anomalous behaviour around . The sample Sb2Te2.8Se0.2 also shows maximum Seebeck coefficient, carrier concentration and thermoelectric power factor. The nature of the scattering mechanism controlling the thermopower data has been explored. The thermoelectric properties of the synthesized materials have been analyzed theoretically in the frame of the Boltzmann equation approach.
PACS: 72.20.Pa – Thermoelectric and thermomagnetic effects / 72.20.-i – Conductivity phenomena in semiconductors and insulators / 61.05.cp – X-ray diffraction
© EPLA, 2016
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