Influence of humidity on the growth characteristics and properties of chemical bath-deposited ZnS thin films

Yi-Cheng or Y. C. Lin, Yen Tai Chao, Pin Chuan Yao

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In this study, the effect of humidity on the growth characteristics and properties of chemical bath-deposited ZnS thin films was systematically investigated. All deposition was conducted by an open CBD system under various relative humidity levels (RH) or by a hermetic CBD system as a comparison. It shows, for films deposited by an open system, the ambient humidity plays an important role in the quality of the resultant films. Damp environments lead to powdery films. Generally, all films prepared in this study using NH 3 and hydrazine hydrate as the complexing agents were amorphous or poorly crystalline. For an open system, the [H + ] from the dissolved carbon dioxide in the air competes with the ammonium ions in the bath solution. According to Le Châtelier's principle, more ammonia was consumed, which favors the free [Zn +2 ] in the solution, facilitating the homogeneous precipitation of Zn(OH) 2 and giving rise to a powdery film. The x-ray photoelectron spectrum shows, for an open system, the content of Zn-O compounds in the form of Zn(OH) 2 and ZnO, etc., is increased by the relative humidity of the environment. The visible transmittance is reduced by RH. The higher optical band gap of the as-deposited films could be attributed to the quantum confinement effects due to the small grain size of the polycrystalline ZnS films over the substrates.

Original languageEnglish
Pages (from-to)724-730
Number of pages7
JournalApplied Surface Science
Volume307
DOIs
Publication statusPublished - 2014 Jul 15

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Atmospheric humidity
Open systems
Thin films
hydrazine
Quantum confinement
Hydrazine
Optical band gaps
Photoelectrons
Hydrates
Ammonium Compounds
Ammonia
Carbon Dioxide
Carbon dioxide
Ions
Crystalline materials
X rays
Substrates
Air

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

Cite this

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abstract = "In this study, the effect of humidity on the growth characteristics and properties of chemical bath-deposited ZnS thin films was systematically investigated. All deposition was conducted by an open CBD system under various relative humidity levels (RH) or by a hermetic CBD system as a comparison. It shows, for films deposited by an open system, the ambient humidity plays an important role in the quality of the resultant films. Damp environments lead to powdery films. Generally, all films prepared in this study using NH 3 and hydrazine hydrate as the complexing agents were amorphous or poorly crystalline. For an open system, the [H + ] from the dissolved carbon dioxide in the air competes with the ammonium ions in the bath solution. According to Le Ch{\^a}telier's principle, more ammonia was consumed, which favors the free [Zn +2 ] in the solution, facilitating the homogeneous precipitation of Zn(OH) 2 and giving rise to a powdery film. The x-ray photoelectron spectrum shows, for an open system, the content of Zn-O compounds in the form of Zn(OH) 2 and ZnO, etc., is increased by the relative humidity of the environment. The visible transmittance is reduced by RH. The higher optical band gap of the as-deposited films could be attributed to the quantum confinement effects due to the small grain size of the polycrystalline ZnS films over the substrates.",
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Influence of humidity on the growth characteristics and properties of chemical bath-deposited ZnS thin films. / Lin, Yi-Cheng or Y. C.; Chao, Yen Tai; Yao, Pin Chuan.

In: Applied Surface Science, Vol. 307, 15.07.2014, p. 724-730.

Research output: Contribution to journalArticle

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