14.4. Thermoelectric confinement in thin films
14.4.1. Titanate thin films
A promising approach to improve the thermoelectric performance is to enhance the Seebeck coefficient by electron confinement into thin layers and simultaneously suppress the thermal conductivity. This approach was aimed for in SrTiO3-based thin films and superlattices (Choi, Ohta, Moon, Lee, & Noh, 2010; Mune, Ohta, Koumoto, Mizoguchi, & Ikuhara, 2007; Ohta, 2007; Ohta, 2008; Ohta et al., 2007, 2008). By fabricating superlattices of SrTiO3 and SrTi0.8Nb0.2O3 with various thicknesses of the SrTi0.8Nb0.2O3 layers, the effect of electron confinement on the Seebeck coefficient was studied, and a significant improvement was indeed obtained. To obtain even stronger confinement, ...
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