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Paper IPM / Physic / 14748

School of Physics

Title:

Influence of annealing temperature on morphological, optical and UV detection properties of ZnO nanowires grown by chemical bath deposition

Author(s):

1 .	R. Bahramian
2 .	H. Eshghi
3 .	A. Moshaii

Status:

Published

Journal:

Materials & Design

Vol.:

107

Year:

2016

Pages:

269-276

Supported by:

IPM

Abstract:

Chemical solution deposition is a low-temperature method with possibly the lowest-cost for growing zinc oxide (ZnO) nanowires (NWs) on an amorphous glass substrate. A ZnO seed layer is needed to initialize uniform growth of oriented nanowires. In the present work, we deposited the seed layer onto the glass substrate using radio frequency magnetron sputtering system. The ZnO NWs were fabricated on the seeded substrate by immersing them in a chemical bath containing zinc nitrate and hexamethylenetetramine aqueous solution. Several properties of as-grown ZnO NWs and annealed ZnO NWs at different temperatures in pure oxygen atmosphere were investigated. Well-defined ZnO nanowires almost perpendicular to the substrate surface were observed through field emission scanning electron microscopy micrographs. X-ray diffraction measurements showed that all ZnO samples possessed a typical wurtzite structure with high crystallinity. The results of UV-Visible spectroscopy and room temperature photoluminescence implied that increasing the annealing temperature could have a significant influence on the performance of samples. The ZnO-based interdigitated metalâsemiconductorâmetal (MSM) configuration was produced using thermal evaporation of silver contacts. The results of currentâvoltage and transient response measurements demonstrate that despite using the low-cost thin film techniques, high responsivity was obtained from the fabricated UV detectors.

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