The carrier concentration and effective mass of mesoporous SrTiO3 films were controlled by the substitution of Ti with V-group elements (V, Nb, and Ta) to enhance the thermoelectric properties. We calculated the effect of the substitution on the effective mass of SrTiO3 by analyzing its structural and electrical properties. When V was used as a substitute, the effective mass increased slightly due to a small change in the V–O bond distance. Moreover, when Nb and Ta were used as substitutes, the effective mass increased owing to an increase in the electronic density of states near the fermi level due to the increased bond length of Nb(or Ta)–O. Consequently, the use of Nb and Ta as substitutes in the SrTiO3 film induced an increase in the figure of merit value, which was due to increases in both the effective mass and carrier concentration.
|Number of pages||6|
|Journal||Journal of the European Ceramic Society|
|Publication status||Published - 2018 Jan|
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant, funded by the Korea government (MSIP) (No. 2015R1A2A1A15054541). This research was also supported by Basic Science Research Program through the NRF, funded by the Ministry of Education (2015R1D1A1A02062229). This work was supported by the Human Resource Development program (No. 20174030201720) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), grant funded by the Korea government Ministry of Trade. The experiments at PLS were supported by MEST and POSTECH.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry