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The effect of surface species on the photoluminescence of porous silicon

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Abstract

The photoluminescence of porous Si immersed in alcohol exhibits a blue shift and a marked decrease in intensity relatively to dry, as-anodized wafers. However, when the immersed samples are treated with ultraviolet (UV) light for a few minutes, the photoluminescence (PL) peak shifts to longer wavelength. Fourier transform infrared spectroscopy reveals that alkoxy surface species and silicon hydride species backbonded to oxygen atoms appear on the UV-treated samples. Furthermore, the PL characteristics and surface species of the UV-treated samples can be recovered to those of as-anodized wafers by dipping in hydrofluoric acid. These results point out the importance of surface chemistry in the luminescence process of porous Si.

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Authors and Affiliations

  1. Microelectronics Research Center, Department of Electrical and Computer Engineering, The University of Texas at Austin, 78712, Austin, TX

    K. -H. Li, C. Tsai & J. C. Campbell

  2. Department of Chemistry and Biochemistry, The University of Texas at Austin, 78712, Austin, TX

    M. Kovar & J. M. White

Authors
  1. K. -H. Li
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  2. C. Tsai
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  3. J. C. Campbell
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  4. M. Kovar
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  5. J. M. White
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Li, K.H., Tsai, C., Campbell, J.C. et al. The effect of surface species on the photoluminescence of porous silicon. J. Electron. Mater. 23, 409–412 (1994). https://doi.org/10.1007/BF02671222

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  • DOI: https://doi.org/10.1007/BF02671222

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