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Kumar, Sunil R. Sarath
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (3/3 displayed)
- 2015Enhanced thermoelectric figure-of-merit in thermally robust, nanostructured superlattices based on SrTiO3citations
- 2014Thermoelectric properties of strontium titanate superlattices incorporating niobium oxide nanolayerscitations
- 2013High temperature thermoelectric properties of strontium titanate thin films with oxygen vacancy and niobium dopingcitations
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article
Enhanced thermoelectric figure-of-merit in thermally robust, nanostructured superlattices based on SrTiO3
Abstract
Thermoelectric (TE) metal oxides overcome crucial disadvantages of traditional heavy-metal-alloy-based TE materials, such as toxicity, scarcity, and instability at high temperatures. Here, we report the TE properties of metal oxide superlattices, composed from alternating layers of 5% Pr3+-doped SrTiO3-δ (SPTO) and 20% Nb5+-doped SrTiO3-δ (STNO) fabricated using pulsed laser deposition (PLD). Excellent stability is established for these superlattices by maintaining the crystal structure and reproducing the TE properties after long-time (20 h) annealing at high temperature (∼1000 K). The introduction of oxygen vacancies as well as extrinsic dopants (Pr3+ and Nb5+), with different masses and ionic radii, at different lattice sites in SPTO and STNO layers, respectively, results in a substantial reduction of thermal conductivity via scattering a wider range of phonon spectrum without limiting the electrical transport and thermopower, leading to an enhancement in the figure-of-merit (ZT). The superlattice composed of 20 SPTO/STNO pairs, 8 unit cells of each layer, exhibits a ZT value of 0.46 at 1000 K, which is the highest among SrTiO3-based thermoelectrics. © 2015 American Chemical Society.