کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1799575 1524848 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural, optical, and conducting properties of crystalline ZnO:Co thin films grown by reactive electron beam deposition
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Structural, optical, and conducting properties of crystalline ZnO:Co thin films grown by reactive electron beam deposition
چکیده انگلیسی


• Fabrication of ZnO and ZnO:Co films through the Reactive Electron Beam deposition technique.
• Reproducible single crystalline structured films.
• Optical properties and band gap values were specified.
• The conductivity depends on crystalline quality and Co concentration.
• The films have potential for optoelectronic applications.

We deposited an undoped ZnO and 6 different Co doped ZnO (ZnO:Co) thin films on fused silica (SiO2) substrates with ~100 nm thickness at substrate temperature of 125 °C using a Reactive Electron Beam Deposition technique. Energy-Dispersive X-ray Spectroscopy (EDS) was used to analyze the elemental composition rates of films. Elemental Co concentration varies from 4.62 to 28.77 at. %. The surface morphologies and grain sizes of thin films were investigated by Scanning Electron Microscope (SEM). The crystal and phase structures of the ZnO:Co thin films were characterized using X-ray diffraction (XRD). The films have single crystal and polycrystalline structures due to Co concentrations. Theoretical crystallite size and strain calculations were performed by applying the Scherrer and Williamson–Hall (W–H) methods. The grain sizes are 2–4 times greater than the crystalline sizes for ZnO:Co films. Optical properties of the films were studied by absorbance measurements using a UV–vis spectrophotometer. The analysis of the optical absorption spectra indicated that the energy band gap of the bulk ZnO film increased from 3.22 eV to maximum 4.17 eV upon Co deposition. Co2+ ion replaces Zn2+ ion in the structure without causing any remarkable defect for its hexagonal Wurtzite structure. Electrical conducting properties were investigated by using a Four Point Probe (FPP) technique. The conductivity depends on crystalline quality and Co concentration.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 373, 1 January 2015, Pages 90–95
نویسندگان
, , , ,