Chemical Bath Deposition Of Ti-Doped Zno Nanorods For Uv-Photodetector Applications
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Date
2018-04
Authors
Bidier, Shaker Ali Hamad Abu
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
This work studied the effects of titanium (Ti) on the properties of zinc oxide
(ZnO) nanorods (NRs) grown on Si substrates using chemical bath deposition
method with TiO2 as a Ti source. X-ray diffraction (XRD) results showed an increase
in the crystallite size from 44.4 nm in the undoped sample to 51.2 nm in the doped
sample. Photoluminescence results revealed an increment in the energy band gap
from 3.241 eV for the undoped sample to 3.293 eV for the doped sample. Hall effect
measurements also showed an enhancement in the electrical properties of doped
samples, the carrier concentration increased from 8.7×1016 cm-3 for the undoped
sample to 2.1×1018 cm-3 for the doped sample. The effects of growth time on the
morphology and structure properties of Ti-doped ZnO were studied. With prolong
the growth time; energy-filtered transmission electron microscopy images revealed
an erosion on the lateral of NRs. This could attribute to the dissolution reaction of
ZnO for longer growth time i.e. 6.5h. These results display the role of growth time in
the modification of the growth directions. Finally, Ti-doped ZnO NRs based on
metal-semiconductor-metal was fabricated. The photoelectric parameters were
enhanced for Ti-doped ZnO device as compared to that of the undoped ZnO device.
For the undoped device the photocurrent, photosensitivity, and responsivity were 61
μA, 1151 %, and 37.4 mA/W, respectively. However, for the doped device, the
parameters were enhanced to 340 μA, 2518 %, and 217.9 mA/W, respectively. This
enhancement indicated an improvement in the structural, optical and electrical
properties due to the incorporation of Ti into the ZnO lattice structure. The obtained
results demonstrate that the Ti-doped ZnO NRs prepared using chemical bath
deposition is suitable for optoelectronic applications.
Description
Keywords
Effects of titanium on the properties of zinc oxide , grown on Si substrates using chemical bath