期刊
JOURNAL OF NANOSTRUCTURES
卷 12, 期 2, 页码 330-342出版社
UNIV KASHAN PRESS
DOI: 10.22052/JNS.2022.02.010
关键词
Cu-doped ZnS thin films; Dopant emission; Nanocrystals; Photoluminescence
This study reports the internal doping of Cu2+ ions into nanocrystalline ZnS thin films using the chemical bath deposition method. XRD analysis shows that the films consist of sub-7 nm cubic ZnS crystallites. The surface morphology of the Cu-doped ZnS films is strongly dependent on the dopant level. The influence of Cu2+ ion concentration on the optical and photoluminescence properties of the Cu:ZnS thin films has been investigated.
In this paper, using the chemical bath deposition method and employing the suitable deposition temperature, internal doping of Cu2+ ions into nanocrystalline ZnS thin films is reported. X-ray diffraction analysis (XRD) was used to evaluate the structure of the films, which consists of sub-7 nm crystallites of the cubic ZnS. FE-SEM images indicated that the surface morphology of the Cu-doped ZnS films is strongly dependent on dopant level. The influence of the Cu2+ ions concentration on optical and specially photoluminescence properties of the Cu:ZnS thin films have been investigated and discussed. Defect-free emission spectra at low deposition temperatures and the appearance of the dopant-related emission peak at higher temperatures demonstrate that this method is an effective strategy for chemical deposition of the Cu-doped ZnS nanocrystals on glass substrates. Furthermore, the concentration quenching effect on photoluminescence intensity has been observed which can be related to non-radiative transitions between electronic energy levels of the neighboring Cu2+ ions in the ZnS host lattice.
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