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Microstructure and Optical Bandgap of Cobalt Selenide Nanofilms

  • SEMICONDUCTOR STRUCTURES, LOW-DIMENSIONAL SYSTEMS, AND QUANTUM PHENOMENA
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Abstract

The purpose of this research is to explore the properties of CoSe nanostructured thin films on glass substrates prepared by a chemical solution deposition method. Special attention is given to study the effects of precursor concentrations (Cobalt(II) acetate, Ammonia and Sodium Selenosulphite), fixing the Co:Se concentration ratio, on the grainy structure and optical properties of the resulting thin films. The structural, chemical composition and morphological characteristics were investigated by X-ray diffraction (XRD), energy dispersive X-ray microanalysis (EDX) and scanning electron microscopy (SEM), respectively. The optical properties were determined by UV–visible spectroscopy determining the optical band gap energy (Eg). According to these results, the average particle diameter was decreased from 119 to 42 nm as the precursor salt concentration was decreased from 0.3 to 0.1 M, being the bigger nanoparticles more spherical. With the reduction of the particle size, a blue shift in the absorption peaks of the UV–visible spectra and an increment of their optical band gap energy (from 1.8 to 3.6 eV) occurred due to confinement effects.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, Malayer University, Malayer, Iran

    Nader Ghobadi & Fatemeh Amiri

  2. Vacuum Technology Research Group, ACECR, Sharif University Branch, Tehran, Iran

    Fatemeh Hafezi, Ali Arman & Mohsen Mardani

  3. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

    Sirvan Naderi

  4. Universidad Autónoma de Nuevo León, Facultad de Ciencias Físico Matemáticas, Av. Universidad S/N, 66455, San Nicolás de los Garza, Nuevo Leon, Mexico

    Carlos Luna

  5. Department of Physics, Faculty of Science, Imam Khomeini International University, Qazvin, Iran

    Reza Shakoury

  6. Technical University of Cluj-Napoca, the Directorate of Research, Development and Innovation Management (DMCDI), Cluj County, Romania

    Ştefan Ţălu

  7. Department of Physics, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

    Sahar Rezaee

  8. Department of Physics, Iran University of Science and Technology, Narmak, 16846-13114, Tehran, Iran

    Maryam Habibi

Authors
  1. Nader Ghobadi
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  9. Sahar Rezaee
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Correspondence to Sahar Rezaee.

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FINANCIAL DISCLOSURE

Neither author has a financial or proprietary interest in any material or method mentioned.

COMPETING INTEREST

The authors declare that they have no competing interest.

ORCID

Sahar Rezaee, https://orcid.org/0000-0001-5034-0810

Ali Arman, https://orcid.org/0000-0003-1246-0453

Ştefan Ţălu, http://orcid.org/0000-0003-1311-7657.

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Ghobadi, N., Hafezi, F., Naderi, S. et al. Microstructure and Optical Bandgap of Cobalt Selenide Nanofilms. Semiconductors 53, 1751–1758 (2019). https://doi.org/10.1134/S1063782619130074

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  • DOI: https://doi.org/10.1134/S1063782619130074

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