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DS: Fachverband Dünne Schichten

DS 12: Poster Session II: Functionalized semiconductor nanowires (jointly with HL); Resistive switching (jointly with DF, KR, HL); Thermoelectric materials

DS 12.22: Poster

Montag, 11. März 2013, 17:00–20:00, Poster B1

Anomalous enhancement of the thermoelectric figure of merit by V co-doping in SrTiO₃ — •Udo Schwingenschlögl and Mousumi Upadhyay-Kahaly — KAUST, PSE Division, Thuwal, Saudi Arabia

The effect of V co-doping in Nb-SrTiO₃ and Pr-SrTiO₃ is studied by full-potential density functional theory. While in Nb-SrTiO₃ a high carrier density counteracts a high thermoelectric figure of merit, the trend is inverted by V co-doping. A similar but even more pronounced effect is found in Pr-SrTiO₃. The mechanism leading to this behavior is explained in terms of a local spin-polarization introduced by the V ions. Our results indicate that magnetic co-doping can be a prominent tool for improving the thermoelectric figure of merit.

Reference: Applied Physics Letters 100, 193110 (2012)