Abstract

ABSTRACTWe investigated electrical and structural properties of Ta-doped SnO2(TTO) films on anatase TiO2seed layers with various growth parameters of pulsed laser deposition. We found that anatase TiO2seed layers induced pseudo-epitaxial (100) growth of TTO films with enhanced mobility (μ) in a wide range of growth parameters. The highestμof 83 cm2V-1s-1[resistivity (ρ) of 2.8 × 10-4Ωcm] and the lowestρof 1.8 × 10-4Ωcm (μof 60 cm2V-1s-1) were obtained at a substrate temperature of 600 °C. Amorphization and (101)-preferred growth competed with (100) growth on the TiO2seed layer at low temperatures. Introducing sufficient process oxygen suppressed such unwanted film growth, resulting in improved transport properties.

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