Accessible Requires Authentication Published by De Gruyter February 15, 2013

CBD grown ZnO nanostructures: effects of solution temperature

Süleyman Kahraman, Hacı Mustafa Çakmak, Samed Çetinkaya, Hacı Ali Çetinkara and Hüsnü Salih Güder

In the present study, textured and highly oriented nano-structured ZnO films were synthesized via chemical bath deposition. The effects of solution temperature have been investigated. It is concluded that the solution temperature is crucial to the crystallography, morphology, electrical and optical behaviors of the ZnO films. X-ray diffraction studies and scanning electron microscopy observations revealed that the structures grown at 95°C had a large aspect ratio, a faster c-axis growth and better vertical orientation than those obtained at relatively lower temperature. The variations depending on solution temperature have been provisionally explained theoretically. Electrical resistivity and activation energies of the films decreased with increasing solution temperature. The variation was attributed to enhancement in the crystallographic structure with increasing growth temperature and to delocalized phonon states. Through the optical absorption spectra a red shift was observed and attributed to crystal defects, non-stochiometry that Zn+2 ions substitute oxygen vacancies and delocalized phonon states.

2 Correspondence address, Süleyman Kahraman PhD., Semiconductor Research Laboratory, Physics Department, Mustafa Kemal University, 31034, Hatay, Turkey, Tel.: +903262455845/1637, Fax: +903262455867, E-mail:


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Received: 2012-10-31
Accepted: 2012-12-4
Published Online: 2013-02-15
Published in Print: 2013-08-08

© 2013, Carl Hanser Verlag, München