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Structural and Optical Properties of Homoepitaxial GaN Layers

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Abstract

The review of structural and optical properties of homoepitaxial layers grown by MOVCD on single crystals GaN substrates is presented. The TEM technique is used to characterise the structural properties of epi-layers. It is found that the structural properties of GaN homoepitaxial layers are determined by the polarity of the substrate surface on which the growth takes place. It is shown that threading dislocations are present only in the layers grown on the [0001] “smooth” surface. On the other hand the layers grown on the [0001] “rough” surface are free from vertical defects. The characteristic feature of the growth on the “rough” surface are pinholes. The optical properties of homoepitaxial layers are predominantly determined by the growth polarity as well. It is shown also that the reflectivity measurement is the most precise way to determine the exciton energies and that emissions due to free excitons are strongly affected by polariton effects.

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Authors and Affiliations

  1. Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681, Warsaw, Poland

    J. M. Baranowski, K. Korona, K. Pakuła, R. Stępniewski & A. Wysmołek

  2. High Pressure Research Centre Polish Academy of Sciences, Sokołowska 29/37, 01-142, Warsaw, Poland

    J. M. Baranowski, I. Grzegory, G. Nowak & S. Porowski

  3. Centre for Advanced Materials, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA

    Z. Liliental-Weber

  4. Department of Physics and Measurements Technology, Likoping University, S-581 83, Linkoping, Sweden

    B. Monemar & P. Bergman

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  1. J. M. Baranowski
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  2. Z. Liliental-Weber
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  3. K. Korona
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  4. K. Pakuła
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  5. R. Stępniewski
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  6. A. Wysmołek
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  7. I. Grzegory
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  8. G. Nowak
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  9. S. Porowski
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  11. P. Bergman
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Correspondence to J. M. Baranowski.

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Baranowski, J.M., Liliental-Weber, Z., Korona, K. et al. Structural and Optical Properties of Homoepitaxial GaN Layers. MRS Online Proceedings Library 449, 393–404 (1996). https://doi.org/10.1557/PROC-449-393

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  • DOI: https://doi.org/10.1557/PROC-449-393

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