Anomalous enhancement of the thermoelectric figure of merit by V co-doping of Nb-SrTiO3

作者：Ozdogan K^*; Kahaly M Upadhyay; Alshareef H N; Schwingenschloegl U

来源：Applied Physics Letters, 2012, 100(19): 193110.

DOI：10.1063/1.4714541

The effect of V co-doping of Nb-SrTiO3 is studied by full-potential density functional theory. We obtain a stronger increase of the carrier density for V than for Nb dopants. While in Nb-SrTiO3 a high carrier density counteracts a high thermoelectric figure of merit, the trend is inverted by V co-doping. 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.

• 出版日期2012-5-7