Effect of Deposition Time on Nanostructure ZnO Thin Films Synthesized by Modified Thermal Evaporation Technique
The aim of this work is to deposit nanostructure zinc oxide (ZnO) thin films by thermal evaporation system with modified source-substrate orientation. At first, the zinc films have been deposited on bare glass substrate with chamber pressure of 0.04 Torr, source temperature of 700 °C
and various deposition times of 1, 5, 30 min. The prepared zinc film is annealed at 500 °C for 2 hours. The structural, optical, and surface morphological properties of ZnO films have been investigated by X-ray diffraction analysis, ultraviolet/visible and photoluminescence spectrophotometer,
and scanning electron microscopic respectively. All ZnO films have showed high crystallinity with hexagonal wurtzite structure. The nanofibers, nanoflakes and nanospikes like structures are confirmed by SEM images with different deposition times. The average length and diameter of nanospikes
are 1.98 μm and 113 nm respectively. The optical band gap of prepared ZnO films is decreased from 3.26 to 3.09 eV with increase of the deposition time, which can enhance the excitation of ZnO films by the near visible light. The different properties of ZnO films have been investigated
and correlated with deposition time.
Keywords: Crystal Structure; Nanospikes Structure; Thermal Evaporation; Thin Film; Zinc Oxide
Document Type: Research Article
Affiliations: 1: Department of Electrical and Electronic Engineering, Rajshahi University of Engineering and Technology, Rajshahi-6204, Bangladesh 2: Bangladesh Atomic Energy Commission, Dhaka-1000, Bangladesh
Publication date: 01 September 2016
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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