Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/2207
Title: High Power Factor and Enhanced Thermoelectric Performance of SnTe-AgInTe2: Synergistic Effect of Resonance Level and Valence Band Convergence
Authors: Banik, Ananya
Shenoy, U. Sandhya
Saha, Sujoy
Waghmare, Umesh V.
Biswas, Kanishka
Keywords: Chemistry
Ultralow Thermal-Conductivity
Bulk Thermoelectrics
Snte
Figure
Merit
Nanostructures
Efficiency
Pbte
Transport
Crystals
Issue Date: 2016
Publisher: American Chemical Society
Citation: Banik, A.; Shenoy, U. S.; Saha, S.; Waghmare, U. V.; Biswas, K., High Power Factor and Enhanced Thermoelectric Performance of SnTe-AgInTe2: Synergistic Effect of Resonance Level and Valence Band Convergence. Journal of the American Chemical Society 2016, 138 (39), 13068-13075 http://dx.doi.org/10.1021/jacs.6b08382
Journal of the American Chemical Society
138
39
Abstract: Understanding the basis of electronic transport and developing ideas to improve thermoelectric power factor are essential for production of efficient thermoelectric materials. Here, we report a significantly large thermoelectric power factor of similar to 31.4 mu W/cm center dot K-2 at 856 K in Ag and In co-doped SnTe (i.e., SnAgxInxTe1+2x). This is the highest power factor so far reported for SnTe-based material, which arises from the synergistic effects of Ag and In on the electronic structure and the improved electrical transport properties of SnTe. In and Ag play different but complementary roles in modifying the valence band structure of SnTe. In-doping introduces resonance levels inside the valence bands, leading to a significant improvement in the Seebeck coefficient at room temperature. On the other hand, Ag-doping reduces the energy separation between light- and heavy-hole valence bands by widening the principal band gap, which also results in an improved Seebeck coefficient. Additionally, Ag-doping in SnTe enhances the p-type carrier mobility. Co-doping of In and Ag in SnTe yields synergistically enhanced Seebeck coefficient and power factor over a broad temperature range because of the synergy of the introduction of resonance states and convergence of valence bands, which have been confirmed by first-principles density functional theory-based electronic structure calculations. As a consequence, we have achieved an improved thermoelectric figure of merit, zT approximate to 1, in SnAg0.025In0.025Te1.05 at 856 K.
Description: Restricted Access
URI: http://hdl.handle.net/10572/2207
ISSN: 0002-7863
Appears in Collections:Research Articles (Umesh V. Waghmare)
Research Papers (Kaniska Biswas)

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