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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:36 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Solid State Physics and Materials Science
Title:
Electrical properties of templateless electrodeposited ZnO nanowires on metallic interdigitated electrodes
Authors:
Andreea COSTAS(1,2), Camelia FLORICA(1), Elena MATEI(1), Monica ENCULESCU(1), Lucian PINTILIE(1), Ioana PINTILIE(1), Ionut ENCULESCU(1)
Affiliation:
1)National Institute of Materials Physics, PO Box MG-7, 77125, Magurele-Bucharest,Romania
2)Faculty of Physics, University of Bucharest, PO Box MG-11, 77125 Magurele-Bucharest, Romania
E-mail
andreea.costas@infim.ro
Keywords:
ZnO nanowires, electrochemical deposition, photolithography
Abstract:
ZnO nanowires are a very important class of one dimensional nanostructures having unique properties such as: direct band gap energy (3.37 eV), large exciton binding energy (60 meV) at room temperature and high aspect ratio. These have many applications like light-emitting diodes, solar cells, gas sensors etc. In the present study, ZnO nanowires were grown by electrochemical deposition onto interdigitated metallic electrodes using a nitrate bath and different deposition potentials. In order to obtain Ti/Au interdigitated electrodes on Si/SiO2 substrates, photolithography, RF sputtering and vacuum thermal evaporation techniques were employed. Using the electrodeposition self-contacting nanowires were prepared, allowing transport characterization without any contacting additional steps. The nanowires morphology was investigated by scanning electron microscopy. The structural properties were studied by X-ray diffraction. Optical characterization (reflection and photoluminescence) was made and the results were correlated to those obtained from the transport measurements. For all the samples, current-voltage measurements were performed at different temperatures. For samples having high number of defects, a transport mechanism dominant of space charge limited currents with uniform trap distribution in an energy interval was observed. Meanwhile, for the samples having low defect emission, the shallow level traps become predominant in the space charge limited current model.
Acknowledgement:
The authors acknowledge the financial contribution of UEFISCDI, project PD number 18/2013. Andreea Costas was supported by the strategic grant POSDRU/159/1.5/S/137750, “Project Doctoral and Postdoctoral programs support for increased competitiveness in Exact Sciences research”, which is cofinanced by the European Social Foundation within the Sectorial Operational Program Human Resources Development 2007–2013.
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