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Improved optical transparency of calcium-doped ZnO thin films

İ. POLAT1,* , S. YILMAZ2, M. TOMAKIN3, E. BACAKSIZ4

Affiliation

  1. Department of Energy Systems Engineering, Faculty of Technology, Karadeniz Technical University, Trabzon, Turkey
  2. Department of Materials Engineering, Faculty of Engineering, Adana Alparslan Türkeş Science and Technology University, Adana, Turkey
  3. Department of Physics, Faculty of Arts and Sciences, Recep Tayyip Erdogan University, Rize, Turkey
  4. Department of Physics, Faculty of Sciences, Karadeniz Technical University, Trabzon, Turkey

Abstract

ZnO thin films with various Ca-doping contents were produced by spray pyrolysis. X-ray diffraction results showed that all samples had a hexagonal structure. Morphological analysis indicated that all films had granular topography. The best transparency was obtained for 2 at.% Ca-doped ZnO samples. Band gap of ZnO thin films was found to be 3.22 eV and didn’t change with increasing of Ca-doping. Photoluminescence data indicated that all samples had four emission peaks. Electrical measurements revealed that Ca-doping resulted in a gradual improvement of carrier density and consequently a decrement of resistivity, which is important for application areas in opto-electronics..

Keywords

Ca-doped ZnO, Thin films, Morphology, Transparency, Carrier concentration.

Citation

İ. POLAT, S. YILMAZ, M. TOMAKIN, E. BACAKSIZ, Improved optical transparency of calcium-doped ZnO thin films, Optoelectronics and Advanced Materials - Rapid Communications, 13, 5-6, May-June 2019, pp.326-332 (2019).

Submitted at: Aug. 22, 2018

Accepted at: June 14, 2019