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Majority carrier transport in single crystal rutile nanowire arrays
Author(s) -
Mohammadpour Arash,
Farsinezhad Samira,
Wiltshire Benjamin D.,
Shankar Karthik
Publication year - 2014
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201308296
Subject(s) - rutile , nanowire , materials science , nanotechnology , nanomaterials , electron mobility , charge carrier , photovoltaics , optoelectronics , photovoltaic system , chemical engineering , electrical engineering , engineering
Monocrystalline n‐TiO 2 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 cm 2 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 ∼10 14 cm –3 and a trap density of 3.5 × 10 16 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)