Acta Metallurgica Sinica (English Letters) ›› 2015, Vol. 28 ›› Issue (1): 110-114.DOI: 10.1007/s40195-014-0177-5

• Orginal Article • Previous Articles     Next Articles

Spray Pyrolysis Deposition of ZnO Thin Films from Zinc Chloride Precursor Solution at Different Substrate Temperatures

Fahimeh Zahedi1, Reza Sabet Dariani1(), Seyed Mohammad Rozati2   

  1. 1.Department of Physics, Alzahra University, 1993893973 Tehran, Iran
    2. Department of Physics, University of Guilan, 4193833697 Rasht, Iran
  • Received:2014-11-18 Revised:2014-11-18 Online:2015-01-10 Published:2015-07-23

Abstract:

ZnO films were prepared at different substrate temperatures through spraying pyrolysis deposition of zinc chloride precursor onto glass substrate. Substrate temperature affects surface morphology of films and therefore their optical and electrical properties. All films are polycrystalline with Wurtzite crystal structure and preferentially grow along c-axis direction. Formation of ZnO rods start at about 500°C. The diameter and length of rods deposited at 500°C are 350-500 and 550-700nm, respectively. By increasing substrate temperature, film becomes more coverage and diameter of the rods reduces to 250-300nm but their length increases to 1,000-1,200 nm, respectively. Optical transmission in visible region decreases with increasing substrate temperature. An ultraviolet emission and two visible emissions at 2.82 and 2.37eV are observed for photoluminescence spectra at room temperature. The resistivity of ZnO films increases with increasing substrate temperature due to surface morphology.

Key words: ZnO, Rods, Spray pyrolysis, Substrate temperature, Surface morphology