Effect of complexing agent and annealing atmosphere on properties of nanocrystalline ZnS thin films

Seung Wook Shin, Hyun Pil Oh, S. M. Pawar, Jong Ha Moon, Jin Hyeok Kim

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10 Scopus citations


The nanocrystalline Zinc Sulfide (ZnS) thin films were prepared on glass substrates by chemical bath deposition (CBD) method using aqueous solutions of zinc acetate, thiourea and tri-sodium citrate in alkaline medium at 80 °C. The tri-sodium citrate acts as a complexing agent. The effects of complexing agent and annealing atmosphere (95%N 2 + 5%H 2S) on structural, morphological and optical properties of ZnS thin films were studied using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and optical absorption. XRD study revealed that single phase ZnS powder was formed in the solution with tri-sodium citrate, however, ZnS and ZnO mixed phase powder was formed In the solution without tri-sodium citrate. The films deposited with trisodium citrate showed ZnS with hexagonal wurtzite phase. However, annealed film in (N 2 + H 2S) atmosphere showed cubic (zincblende) phase. FE-SEM images show that grain size of as-deposited and annealed ZnS films are about 20 nm and 50 nm, respectively. Optical absorption study showed that the films have moderate optical transmission from 65% to 75% in the visible region and the optical band gap energy of as-deposited ZnS film is 3.91 eV and it decreases to 3.73 eV after annealing

Original languageEnglish (US)
Pages (from-to)3686-3690
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Issue number5
StatePublished - May 1 2010


  • Annealing
  • Chemical bath deposition (CBD)
  • Complexing agent
  • Nanocrystalline
  • ZnS film


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