Abstract
Thin films of CuO having an average thickness of 720 nm were deposited on clean glass substrates using the Aqueous Chemical Growth (ACG) method with Cu(NO3)2 and C6H12N4 as precursors and annealed at different temperatures in order to determine the effect of annealing temperature on their optical and solid state properties. The study was carried out using Rutherford Backscattering (RBS) spectroscopy for t thickness and chemical composition, X-Ray Diffraction (XRD) for crystallographic structure and a UV-VIS spectrophotometer for spectral analysis. The results indicate that the absorbance and absorption/extinction coefficient of the films vary inversely with annealing temperature while the transmittance, reflectance, direct band gap, real/imaginary dielectric constants and refractive index vary directly with annealing temperature. The results further indicate an improvement in crystallinity as annealing temperature increases. The as-deposited and annealed ACG CuO thin films were found to be suitable for use as window layer in solar cells among other electronic and optoelectronic applications.
Highlights
Copper oxide exist in two stable forms [cupric oxide or copper monoxide (CuO) and cuprous oxide (Cu2O)] and an unstable state [paramelaconite (Cu4O3)] [1]
Since the chemical and physical properties of CuO solely depend on its size and morphology [13], so many researchers have concentrated their effort on the synthesis of nano structures of CuO in order to apply them in nanoelectronics, optoelectronics, biosensors etc. [14]
This paper presents the effect of annealing temperature on the optical and solid state properties of cupric oxide thin films deposited using the aqueous chemical growth method
Summary
Copper oxide exist in two stable forms [cupric oxide or copper monoxide (CuO) and cuprous oxide (Cu2O)] and an unstable state [paramelaconite (Cu4O3)] [1]. Several techniques have been used to synthesis CuO These include, rapid precipitation, spin coating [40,42], solid state reaction [42], chemical vapor deposition, sonochemical reaction, sol-gel tech-. The solid state and optical properties of the annealed samples were determined and compared with those of the as-prepared sample This method has the advantages of simplicity, low cost of production, ease of reproduction, local availability of production materials, environmental friendliness, non requirement of surfactants, templates and complexing agents, ability to produce nanostructures and suitability for large scale production among others [49,50,51]. This paper presents the effect of annealing temperature on the optical and solid state properties of cupric oxide thin films deposited using the aqueous chemical growth method
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