Titanium-dioxide nanotube p-n homojunction diode

Journal Article · Mon Dec 29 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4905218· OSTI ID:22395622

Alivov, Yahya; Ding, Yuchen; Singh, Vivek ^[1]; Nagpal, Prashant ^[1]

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1. Department of Chemical and Biological Engineering, University of Colorado Boulder, 3415 Colorado Avenue, Boulder, Colorado 80303 (United States)

Application of semiconductors in functional optoelectronic devices requires precise control over their doping and formation of junction between p- and n-doped semiconductors. While doped thin films have led to several semiconductor devices, need for high-surface area nanostructured devices for photovoltaic, photoelectrochemical, and photocatalytic applications has been hindered by lack of desired doping in nanostructures. Here, we show titanium-dioxide (TiO{sub 2}) nanotubes doped with nitrogen (N) and niobium (Nb) as acceptors and donors, respectively, and formation of TiO{sub 2} nanotubes p-n homojunction. This TiO{sub 2}:N/TiO{sub 2}:Nb homojunction showed distinct diode-like behaviour with rectification ratio of 1115 at ±5 V and exhibited good photoresponse for ultraviolet light (λ = 365 nm) with sensitivity of 0.19 A/W at reverse bias of −5 V. These results can have important implications for development of nanostructured metal-oxide solar-cells, photodiodes, LED's, photocatalysts, and photoelectrochemical devices.

• OSTI ID: 22395622
• Journal Information: Applied Physics Letters, Vol. 105, Issue 26; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
DOPED MATERIALS
ELECTRIC CONTACTS
NANOTUBES
NIOBIUM
NITROGEN
OPTOELECTRONIC DEVICES
PHOTOCATALYSIS
PHOTODIODES
PHOTOVOLTAIC EFFECT
P-N JUNCTIONS
SEMICONDUCTOR MATERIALS
SOLAR CELLS
SURFACE AREA
THIN FILMS
TITANIUM OXIDES
ULTRAVIOLET RADIATION
VISIBLE RADIATION