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Optical Properties of MBE-Grown Hg1−xCdxSe

  • U.S. Workshop on Physics and Chemistry of II-VI Materials 2018
  • Published:
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Abstract

In this work, we present a study on the temperature-dependent infrared absorption spectra of Hg1−xCdxSe grown by molecular beam epitaxy (MBE) on GaSb (211) substrate, having a nominal x-value of 0.21. For temperatures below 200 K, the observed optical bandgap is found to correspond to the Fermi energy level rather than the intrinsic bandgap, which is quantitatively explained by the Burstein–Moss shift due to the presence of a background electron concentration of 3.5 × 1016 cm−3. In addition, empirical formulae for calculating both the absorption edge and intrinsic absorption coefficient in the Kane region have been derived from the previously reported absorption spectra of Bridgeman-grown Hg1−xCdxSe samples (0.15 ≤ x ≤ 0.3). By employing the empirical expressions, the infrared transmission spectra have been modeled based on the characteristic matrix method, and the x value profile of the sample along the growth direction has been determined, which is in good agreement with the experimental results obtained from secondary ion mass spectrometry (SIMS) depth profiling combined with Rutherford backscattering spectrometry (RBS).

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Acknowledgments

This work was supported by the Australian Research Council (FT130101708, DP170104562, and LE170100233), and a Research Collaboration Awards from the University of Western Australia. Facilities used in this work are supported by the WA node of the Australian National Fabrication Facility (ANFF).

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Authors and Affiliations

  1. Department of Electrical Electronic and Computer Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia

    W. W. Pan, Z. K. Zhang, W. Lei & L. Faraone

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  1. W. W. Pan
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  2. Z. K. Zhang
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  4. L. Faraone
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Correspondence to W. Lei.

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Pan, W.W., Zhang, Z.K., Lei, W. et al. Optical Properties of MBE-Grown Hg1−xCdxSe. J. Electron. Mater. 48, 6063–6068 (2019). https://doi.org/10.1007/s11664-019-07362-9

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  • DOI: https://doi.org/10.1007/s11664-019-07362-9

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