Improved optical transparency of calcium-doped ZnO thin films


POLAT İ., YILMAZ S., Tomakin M. , BACAKSIZ E.

OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS, vol.13, pp.326-332, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 13
  • Publication Date: 2019
  • Title of Journal : OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS
  • Page Numbers: pp.326-332
  • Keywords: Ca-doped ZnO, Thin films, Morphology, Transparency, Carrier concentration, ZINC-OXIDE, ELECTRICAL-PROPERTIES, GROWTH, NANOSTRUCTURES, NANOPARTICLES, TEMPERATURE, NANORODS, MICROSTRUCTURE

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'tchange 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.