Abstract
Electric-field thermopower modulation method is demonstrated in detail using SrTiO3-based field-effect transistor structure as an example. Using water-infiltrated nanoporous 12CaO·7Al2O3 glass “CAN” as the gate insulator, carrier electrons up to ~1015 cm−2 can accumulate within an extremely narrow 2D electron gas (~2 nm), leading to an unusually large enhancement of thermopower. Our electric field-effect approach should be applicable to fully verify the performance of thermoelectric materials with complicated crystal structures. This approach may accelerate the development of nanostructures of high performance thermoelectric materials.
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Acknowledgements
The author thanks Y. Sato, T. Kato, S. Zheng, K. Abe, H. Kumomi, S–W. Kim, K. Nomura, Y. Ikuhara, H. Hosono, T. Mizuno, and R. Asahi for the experimental helps and the valuable discussions. This work was supported by MEXT (22360271, 22015009).
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Ohta, H. Electric-field thermopower modulation in SrTiO3-based field-effect transistors. J Mater Sci 48, 2797–2805 (2013). https://doi.org/10.1007/s10853-012-6856-6
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DOI: https://doi.org/10.1007/s10853-012-6856-6