Doping site dependent thermoelectric properties of epitaxial strontium titanate thin films

Autor:	Husam N. Alshareef, Terry M. Tritt, Anas Abutaha, S. R. Sarath Kumar, Arash Mehdizadeh Dehkordi
Rok vydání:	2014
Předmět:	Materials science business.industry Doping General Chemistry Epitaxy chemistry.chemical_compound Thermal conductivity chemistry Electrical resistivity and conductivity Seebeck coefficient Thermoelectric effect Materials Chemistry Strontium titanate Optoelectronics Thin film business
Zdroj:	J. Mater. Chem. C. 2:9712-9719
ISSN:	2050-7534 2050-7526
DOI:	10.1039/c4tc01723d
Popis:	We demonstrate that the thermoelectric properties of epitaxial strontium titanate (STO) thin films can be improved by additional B-site doping of A-site doped ABO3 type perovskite STO. The additional B-site doping of A-site doped STO results in increased electrical conductivity, but at the expense of Seebeck coefficient. However, doping on both sites of the STO lattice significantly reduces the lattice thermal conductivity of STO by adding more densely and strategically distributed phononic scattering centers that attack wider phonon spectra. The additional B-site doping limits the trade-off relationship between the electrical conductivity and total thermal conductivity of A-site doped STO, leading to an improvement in the room-temperature thermoelectric figure of merit, ZT. The 5% Pr3+ and 20% Nb5+ double-doped STO film exhibits the best ZT of 0.016 at room temperature.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::72e51707c610e09460897dd22d0f00bc https://doi.org/10.1039/c4tc01723d Zobrazit plný text záznamu