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The effect of deposition time on the structural and optical properties of β-Ga2O3 nanowires grown using CVD technique

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Abstract

In the present work, we have investigated the effect of deposition time on the morphological, structural, and photoluminescence (PL) properties of β-Ga2O3 NWs grown by CVD technique. The diameter and length of the as-grown NWs varied for the deposition time of 1–4 h, from 50 to 100 nm and 5–15 μm, respectively. The crystalline quality of the NWs improved with increasing the deposition time. The detailed transmission electron microscopy (TEM) and fast Fourier Transformation (FFT) measurements revealed that the as-grown β-Ga2O3 NWs were single crystalline. Furthermore, we have studied the variation of PL spectra of the NWs with deposition time and provided an energy band diagram to give a plausible explanation of the origin of different emissions in the PL spectra. The PL spectra showed a broad strong UV-blue emission band and a weak red emission for 1 h deposited sample. We suggested that the UV and red emission from β-Ga2O3 NWs are related to oxygen vacancies and impurities such as nitrogen, respectively. It was observed that the intensity of UV emission decreased with deposition time and this reduction was attributed primarily to the reduction of oxygen vacancies in the NWs.

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Acknowledgments

The authors gratefully thank the XRD and SEM measurement facilities of IIT Delhi. The authors acknowledge the Nanoscale Research Facility (NRF), IIT Delhi for providing partial financial support for this work. One of the authors (Sudheer Kumar) also acknowledges IIT Delhi for providing research fellowship.

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Authors and Affiliations

  1. Department of Physics, Indian Institute of Technology Delhi, New Delhi, 110016, India

    Sudheer Kumar, Vipin Kumar, Trilok Singh & R. Singh

  2. Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120, Halle, Germany

    A. Hähnel

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  1. Sudheer Kumar
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  2. Vipin Kumar
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  3. Trilok Singh
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  4. A. Hähnel
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  5. R. Singh
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Correspondence to Sudheer Kumar.

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Kumar, S., Kumar, V., Singh, T. et al. The effect of deposition time on the structural and optical properties of β-Ga2O3 nanowires grown using CVD technique. J Nanopart Res 16, 2189 (2014). https://doi.org/10.1007/s11051-013-2189-x

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