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Publication - Dr Chris Bell

    Atomically-engineered epitaxial anatase TiO2 metal-semiconductor field-effect transistors


    Kim, B, Minohara, M, Hikita, Y, Bell, C & Hwang, HY, 2018, ‘Atomically-engineered epitaxial anatase TiO2 metal-semiconductor field-effect transistors’. Applied Physics Letters, vol 112.


    Anatase TiO2 is a promising material for a vast array of electronic, energy, and environmental applications, including photocatalysis, photovoltaics, and sensors. A key requirement for these applications is the ability to modulate its electrical properties without dominant dopant scattering and while maintaining high carrier mobility. Here, we demonstrate the room temperature field-effect modulation of the conducting epitaxial interface between anatase TiO2 and LaAlO3 (001), which arises for LaO-terminated LaAlO3, while the AlO2-terminated interface is insulating. This approach, together with the metal-semiconductor field-effect transistor geometry, naturally bypasses the gate/channel interface traps, resulting in a high field-effect mobility μFE of 3.14 cm2 (V s)−1 approaching 98% of the corresponding Hall mobility μHall μHall. Accordingly, the channel conductivity is modulated over 6 orders of magnitude over a gate voltage range of ∼4 V.

    Full details in the University publications repository