Thermoelectric properties of reduced and La-doped single-crystalline SrTiO3

High-temperature thermoelectric response of double-dopedSrTiO3epitaxial films

“…It is possible that we are observing the gap between the oxygen vacancy defect band and the conduction band for this sample. For finite La doping, thermopower shows a linear increase with temperature, similar to the observation of Muta et al 22 Even though we observe a linear temperature dependence of thermopower, it is hard to extract useful information on Fermi energy, as the doping regime is in a transition from non-degenerate to degenerate for these carrier concentrations. This transition will be later discussed based on the galvanomagnetic properties.…”

First-Principles Modeling of SrTiO3Based Oxides for Thermoelectric Applications

“…2). Therefore, the underestimation of experimental power factors P F exp of ∼2-3 mW/mK 2 [2,81,84] We assign the underestimation of P F exp to the enhancement of carrier effective mass due to the electronphonon coupling interaction, which is compatible with the fact that the electronic transport in n-type SrTiO 3 has a polaronic nature. [85] A factor of 3 larger inertial effective mass m * i was obtained from experimental optical conductivity relative to the theoretical m * i value of ∼0.63m e estimated within LDA.…”

Thermoelectric properties of n-type SrTiO3

“…There have been a number of studies of the thermal conductivity measurements on both the bulk and doped STO at elevated temperatures. [20][21][22][23][24][69][70][71][72] Due to the significant difference of κ between bulk and heavily doped materials, we consider two scenarios with one taking the bulk κ at 300 K (∼11 W m −1 K −1 ) 21,71 and the other using the doped κ at the same T (∼8 W m −1 K −1 , based on moderately doped samples 21,24 ). With the second scenario, we are able to get low κ from 2.3 to 2.5 W m −1 K −1 at 1000 K. These values are in better accord with experiments at high temperatures (∼1000 K).…”