| Résumé | 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 electrochemical battery anodes. Carrier transport in Rtl-NWs is of fundamental importance but has hitherto been inferred indirectly via impedance and intensity-modulated spectroscopic techniques. We report an effective electron drift mobility of 1.95 × 10-5 cm2 V-1 s-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 ∼1014 cm-3 and a trap density of 3.5 × 1016 cm-3 in rutile nanowires. These results point to the importance of reducing traps to improve charge transport in rutile nanowires. Transient photocurrents in rutile nanowires. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
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