Majority carrier transport in single crystal rutile nanowire arrays
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Monocrystalline n-TiO2 nanowires of the rutile phase (Rtl-NWs) grown by a scalable hydrothermal method constitute a functional oxide nanomaterial with potential applications in photovoltaics, photocatalysts, field emitters and electro-chemical battery anodes. Carrier transport in Rtl-NWs is of fundamental importance but has hitherto been inferred in-directly via impedance and intensity-modulated spectro-scopic techniques. We report an effective electron drift mobility of 1.95 x 10^-5 cm2 V-1s-1 in rutile nanowire arrays directly measured using the time-of-flight (TOF) and space charge limited current techniques. In addition, we measure an equilibrium free electron concentration of ~10^14 cm-3 and a trap density of 3.5 x 10^16 cm-3 in rutile nanowires. These results point to the importance of reducing traps to improve charge transport in rutile nanowires.
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http://purl.org/coar/resource_type/c_6501 http://purl.org/coar/version/c_71e4c1898caa6e32 http://purl.org/coar/version/c_b1a7d7d4d402bcce
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en