Abstract
ZnO nanorods are promising materials for many applications, in particular for UV detectors. In the present paper, the properties of high crystal quality individual ZnO nanorods and nanorod arrays grown by the self-catalytic CVD method have been investigated to assess their possible applicationsfor UV photodetectors. X-ray diffraction, Raman spectroscopy and cathodoluminescence investigations demonstrate the high quality of nanorods. The nanorod resistivity and carrier concentration in dark is estimated. The transient photocurrent response of both as grown and annealed at 550 °C nanorod array under UV illumination pulses is studied. It is shown that annealing increases the sensitivity and decreases the responsivity that is explained by oxygen out-diffusion and the formation of near surface layer enriched with oxygen vacancies. Oxygen vacancy formation due to annealing is confirmed by an increase of green emission band intensity.
Highlights
Aligned Nanorod Arrays for SensorZinc oxide, a well-known direct bandgap II–VI semiconductor, is a material with large exciton binding energy (60 meV) and a wide bandgap (Eg ~ 3.37 eV) [1], suitable for short wavelength optoelectronic applications [2]
The performance of the UV sensors depends both on the state of the zinc oxide surface and on the concentration of intrinsic defects, which strongly depends on synthesis conditions and/or by post-synthesis treatment
Zinc was placed in the first zone, and substrates were placed in the second zone
Summary
A well-known direct bandgap II–VI semiconductor, is a material with large exciton binding energy (60 meV) and a wide bandgap (Eg ~ 3.37 eV) [1], suitable for short wavelength optoelectronic applications [2]. One-dimensional (1D) ZnO nanocrystals have a perfect structure and a developed surface, which gives them certain advantages when used in the abovementioned practical applications [5,16]. In this regard, the ordered arrays of zinc oxide nanorods (NR) obtained by various methods are of great interest to researchers [21,22]. One of the advantages of this method is the possibility to deposit ordered arrays of high-quality singlecrystal ZnO nanorods both on silicon substrates of various orientations and on inexpensive transparent glass substrates [25], which makes it attractive for practical applications. The performance of the UV sensors depends both on the state of the zinc oxide surface and on the concentration of intrinsic defects, which strongly depends on synthesis conditions and/or by post-synthesis treatment
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