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Title: | Effects of gold nanosandwiching on the structural and optical properties of Copper selenide thin films رسالة ماجستير |
Authors: | Owdah, Tahani S A Bani$AAUP$Palestinian |
Keywords: | CuSe, plasmon, X-ray diffraction, band gap. |
Issue Date: | 2019 |
Publisher: | AAUP |
Abstract: | In this work, the structural and optical properties of copper selenide thin films which are prepared by the nanosandwiching technique are studied. Particularly, gold thin film layers of thicknesses less than 250 nm are used as mid-layer between two 500 nm thick copper selenide layers. The effect of the gold film on the structural, optical and dielectric properties of copper selenide were characterized using X-ray diffraction, scanning electron microscopy, and UV- visible spectrophotometry techniques. Also, the lattice parameters, microstrain, grain size, dislocation density, stacking faults, and absorption coefficient spectra as well as the energy band gap and dielectric dispersion are studied in details. In addition, the effects of the gold metal on the optical conductivity spectra and optical conduction parameters are explored through the Drude Lorentz modeling of optical conductivity. The scanning electron microscopy imaging has shown that the two stacked layers of CuSe exhibit needle like grains whose length reaches l.5 m. Insertion of gold between layers of CuSe converts the needles to tubes of length of 2.5 m and width of 220 nm. It was also observed that insertion of Au layers between layers of CuSe increases the strain and dislocation density and decreases the crystallite size leading to a strained structure. Studies of the temperature effects on the structure has shown that increasing the temperature to 473 K increases the grain size and decreases the microstrain and defect density. Optically, the Au nanosandwiching enhanced the light absorbability be more than two times and shrunk the energy bandgap. In addition, an improvement in the dielectric constant in both high frequency and IR range was observed. The optical conductivity analysis also show that the presence of Au improves the optical conduction and increases the drift mobility making CuSe more appropriate for optoelectronic applications. |
Description: | Master’s degree in Physics |
URI: | http://repository.aaup.edu/jspui/handle/123456789/2872 |
Appears in Collections: | Master Theses and Ph.D. Dissertations |
Files in This Item:
File | Description | Size | Format | |
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تهاني عودة.pdf | 18.67 MB | Adobe PDF | View/Open |
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