Abstract
Electric field modulation analysis of thermopower (S)–carrier concentration (n) relation of a bilayer laminate structure composed of a 1.5-nm-thick conducting layer, probably TinO2n–1 (n = 2, 3, …) Magnéli phase, and rutile TiO2, was performed. The results clearly showed that both the rutile TiO2 and the thin interfacial layer contribute to carrier transport: the rutile TiO2 bulk region (mobility μ ∼ 0.03 cm2 V−1 s−1) and the 1.5-nm-thick interfacial layer (μ ∼ 0.3 cm2 V−1 s−1). The effective thickness of the interfacial layer, which was obtained from the S-n relation, was below ∼3 nm, which agrees well with that of the TEM observation (∼1.5 nm), clearly showing that electric field modulation measurement of S-n relation can effectively clarify the carrier transport properties of a bilayer laminate structure.
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