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Structural, optical and dielectric investigations of electrodeposited p-type Cu2O

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Abstract

Electrodeposition technique is employed to prepare cuprous oxide (Cu2O) thin film on fluorine-doped tin oxide (FTO) conducting glass substrate through the reduction of copper lactate in alkaline solution at pH = 12.25. Structural, optical and dielectric properties of the prepared film is investigated by means of scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), UV–Visible absorbance, photoluminescence (PL) and broadband dielectric spectroscopy (BDS). The structural means (XRD, SEM and EDS) revealed the formation of self-assembled cubic microstructure of Cu2O with average grain size of around 1.5 μm. The UV–Vis absorbance spectrum gives optical band gap of 2.05 eV. The PL spectrums confirmed the presence of defect centers ascribed to various forms of oxygen \((V_{O}^{1 + } ,\,V_{O}^{2 + } )\) and copper (\(V_{Cu}^{ 1 + }\)) vacancies which are responsible for the conduction in the Cu2O film. The conduction mechanism in the Cu2O film is successfully described by the correlated barrier hopping (CBH) model in which bipolaron hopping become prominent. The density of defect states N, the effective barrier height W and the hopping distance Rω are also calculated based on the CBH model. Two dielectric relaxation processes (β1 and β2) with Arrhenius temperature dependence and activation energies of 0.31 and 0.48 eV are observed. The fast β2-relaxation process with activation energy of 0.48 eV is attributed to the Maxwell–Wagner-Sillars (MWS) polarization while the slow β1-relaxation process with activation energy of 0.31 eV is due to the hopping of the oxygen and copper vacancies.

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Acknowledgments

The authors would like to thank the Deanship of Scientific Research at Prince Sattam bin Abdulaziz University in Al-Kharj, Saudi Arabia for their support.

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  1. Department of Physics, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, 11942, Saudi Arabia

    Mahdy M. Elmahdy

  2. Department of Physics, Faculty of Science, Mansoura University, 35516, Mansoura, Egypt

    Mahdy M. Elmahdy

  3. Department of Physics, Faculty of Science, Kafrelsheikh University, 33516, Kafrelsheikh, Egypt

    Abdelhamid El-Shaer

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Elmahdy, M.M., El-Shaer, A. Structural, optical and dielectric investigations of electrodeposited p-type Cu2O. J Mater Sci: Mater Electron 30, 19894–19905 (2019). https://doi.org/10.1007/s10854-019-02356-z

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