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Journal cover: Microelectronics International

Microelectronics International

ISSN: 1356-5362

Online from: 1982

Subject Area: Electrical & Electronic Engineering

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Structural and impedance spectroscopy study of Al-doped ZnO nanorods grown by sol-gel method


Document Information:
Title:Structural and impedance spectroscopy study of Al-doped ZnO nanorods grown by sol-gel method
Author(s):Muhammad Kashif, (Institute of Nano Electronic Engineering (INEE), Universiti Malaysia Perlis (UniMAP), Kangar, Malaysia), Uda Hashim, (Institute of Nano Electronic Engineering (INEE), Universiti Malaysia Perlis (UniMAP), Kangar, Malaysia), Md. Eaqub Ali, (Institute of Nano Electronic Engineering (INEE), Universiti Malaysia Perlis (UniMAP), Kangar, Malaysia), Ala'eddin A. Saif, (School of Microelectronic Engineering, Universiti Malaysia Perlis, Kuala Perlis, Malaysia), Syed Muhammad Usman Ali, (Department of Science and Technology, Linköping University, Norrkoping, Sweden and Department of Electronic Engineering, NED University of Engineering and Technology, Karachi, Pakistan), Magnus Willander, (Department of Science and Technology, Linköping University, Norrkoping, Sweden)
Citation:Muhammad Kashif, Uda Hashim, Md. Eaqub Ali, Ala'eddin A. Saif, Syed Muhammad Usman Ali, Magnus Willander, (2012) "Structural and impedance spectroscopy study of Al-doped ZnO nanorods grown by sol-gel method", Microelectronics International, Vol. 29 Iss: 3, pp.131 - 135
Keywords:Electrical impedance, Impedance, Microelectronics, Nanorods, Sol-gel, Temperature, ZnO
Article type:Research paper
DOI:10.1108/13565361211252872 (Permanent URL)
Publisher:Emerald Group Publishing Limited
Abstract:

Purpose – The purpose of this paper is to investigate the electrical transport mechanism of the Al-doped ZnO nanorods at different temperatures by employing impedance spectroscopy.

Design/methodology/approach – Al-doped ZnO nanorods were grown on silicon substrate using step sol-gel method. For the seed solution preparation Zinc acetate dihydrate, 2-methoxyethanol, monoethanolamine and aluminum nitrite nano-hydrate were used as a solute, solvent, stabilizer and dopant, respectively. Prior to the deposition, P-type Si (100) wafer was cut into pieces of 1?cm×2?cm. The samples were then cleaned in an ultrasonic bath with acetone, ethanol, and de-ionized (DI) water for 5?min. The prepared seed solution was coated on silicon substrate using spin coater at spinning speed of 3000?rpm for 30?s and then dried at 250°C for 10?min followed by annealing at 550°C for 1?h. The hydrothermal growth was carried out in a solution of zinc nitrate hexahydrate (0.025M), Hexamethyltetramine (0.025M) in DI water.

Findings – Al-doped ZnO nanorods were characterized using scanning electron microscope (SEM), X-ray diffraction (XRD) and impedance spectroscopy. The impedance measurements were carried out at various temperatures (100°C-325°C). The impedance results showed that temperature has great influence on the impedance; the impedance value decreased as the temperature increased. This decrement is attributed to the increase of the mobility of the defects, especially the oxygen vacancies. The surface morphology of the samples was measured by SEM and X-ray diffraction. The SEM images show that the high density of Al-doped ZnO nanorods covers the silicon substrate, whereas the XRD pattern shows the (002) crystal orientation.

Originality/value – This paper demonstrates the electron transport mechanism of Al-doped ZnO nanorods, at different temperatures, to understand the charge transport model.



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