Effect of different annealing conditions on the properties of chemically deposited ZnS thin films on ITO coated glass substrates

Seung Wook Shin, So Ra Kang, Jae Ho Yun, A. V. Moholkar, Jong Ha Moon, Jeong Yong Lee, Jin Hyeok Kim

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

The effects of different annealing conditions such as atmospheres, temperatures and times on the structural, morphological and optical properties of ZnS thin films prepared on ITO coated glass substrates by chemical bath deposition were studied. Aqueous solutions of zinc acetate and thiourea were used as precursors along with stable complexing agents, such as Na 2EDTA and Na3-citrate, in an alkaline medium. X-ray diffraction patterns showed that the as-deposited and as-annealed ZnS films had an amorphous structure or poor crystallinity below the optimized annealing conditions of 500 °C and 60 min with the exception of the films annealed in N2H2S annealing atmosphere. The ZnS thin films annealed in N2H2S atmosphere for 1 h at 500 °C showed three sharp peaks for the (1 1 1), (2 2 0) and (1 1 3) planes of polycrystalline cubic ZnS without any unwanted secondary ZnO phases. X-ray photoelectron spectroscopy revealed ZnOH and ZnS bonding in the as-deposited ZnS thin film. However, the ZnS thin films annealed at 500 °C showed ZnS bonding regardless of the annealing atmosphere. The sharp absorption edge and band gap energy of the as-deposited and as-annealed ZnS thin films varied from 295 to 310 nm and 3.5 to 3.89 eV, respectively.

Original languageEnglish (US)
Pages (from-to)856-863
Number of pages8
JournalSolar Energy Materials and Solar Cells
Volume95
Issue number3
DOIs
StatePublished - Mar 1 2011

Keywords

  • Annealing atmosphere
  • Annealing temperature
  • Chemical Bath Deposition (CBD)
  • Less-toxic complexing agents
  • Polycrystalline ZnS films
  • XPS studies

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