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First principles studies on the thermoelectric properties of (SrO)(m)(SrTiO3)(n) superlattice

Author:
Zhang, Liang  Lo, Tie-Yu  Wang, Hui-Qiong  Zhang, Wen-Xing  Yang, Shuo-Wang  Zheng, Jin-Cheng  


Journal:
RSC ADVANCES


Issue Date:
2016


Abstract(summary):

The electronic structures and thermoelectric properties of (SrO)(m)(SrTiO3)(n) superlattices have been investigated using first-principles calculations and the Boltzmann transport theory. Due to the much reduced dispersion along the c-axis, the thermoelectric properties for n-type superlattices are found to be highly anisotropic with the in-plane electrical conductivity with respect to relaxation time much higher than the out-of-plane one. The reduction of the in-plane Seebeck coefficient compared with SrTiO3 results in a slightly reduced power factor with respect to relaxation time for n-type doped (SrO)(m)(SrTiO3)(n). However, both Seebeck coefficient and electrical conductivity with respect to relaxation time are relatively maintained for p-type doping, leading to a comparable power factor with respect to relaxation time. If the reduced thermal conductivity is taken into account, an improved ZT value can be expected for the (SrO)(m)(SrTiO3)(n) superlattice.


Page:
102172---102182


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