Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 588, Issue -, Pages 228-234Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.11.042
Keywords
ZnS thin films; Chemical bath deposition; Complexing agent; Reaction mechanism
Categories
Funding
- Guangdong Province
- Ministry of Education [2011A090200003]
- Science and Technology Department of Guangzhou City [12C52111614]
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Zinc sulfide (ZnS) thin films were deposited on glass substrates using the chemical bath deposition (CBD) technique. The effects of different complexing agents (tri-sodium citrate, hydrazine hydrate) and their concentrations on the structure, composition, morphology, optical properties and growth mechanism of ZnS thin films were investigated. The results indicated that the chemical-bath-deposited ZnS thin films exhibit poor crystallinity and a high Zn/S atomic ratio with an average transmittance of 75% in the range of visible light. The ZnS thin films prepared using hydrazine hydrate as the complexing agent present a more compact surface, a smaller average particle size, and a sharper absorption edge at 300-340 nm compared with those prepared using tri-sodium citrate. Based on our experimental observations and analysis, we conclude that the predominant growth mechanism of ZnS thin films is an ion-by-ion process. The nucleation density of Zn(OH)(2) nuclei on the substrate in the initial stage produces the different morphologies and properties of the ZnS thin films prepared using the two complexing agents. (C) 2013 Elsevier B.V. All rights reserved.
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