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Investigation of Chemical Adsorbate Effects on Blue and Red Emitting Porous Silicon Samples

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Abstract

We have investigated the sensitivity of blue (PLmax = 480 nm) and red (PLmax = 660 nm) emitting porous silicon samples to various chemical adsorbates. Steady-state and time-resolved photoluminescence measurements and FTIR spectroscopy were employed to characterize the photophysical and optical effects induced by chemical exposure. The red samples, which are hydrogen terminated, exhibit quenching and recovery of photoluminescence intensity and broadening of the Si-Hx stretch bands upon exposure to liquid methanol. This behavior is attributed to the ability of the Si-Hx specie on the surface of the PSI to interact with the solvent molecules which temporarily traps the electrons and causes PL loss and Si-Hx broadening. The blue samples, which are oxygen terminated, display similar sensitivity to methanol. This sensitivity is attributed to the solvent’s ability to change the surface passivation and thereby introduce competitive radiative and nonradiative recombination channels. The origin of the blue PL is discussed.

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Authors and Affiliations

  1. Department of Chemistry, University of Rochester, Rochester, NY, 14627, USA

    Julie M. Rehm & George L. McLendon

  2. Department of Electrical Engineering, University of Rochester, Rochester, NY, 14627, USA

    Leonid Tsybeskov

  3. Department of Electrical Engineering, Laboratory for Laser Energetics, and The Institute of Optics, University of Rochester, Rochester, NY, 14627, USA

    Philippe M. Fauchet

Authors
  1. Julie M. Rehm
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  2. George L. McLendon
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  3. Leonid Tsybeskov
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  4. Philippe M. Fauchet
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Rehm, J.M., McLendon, G.L., Tsybeskov, L. et al. Investigation of Chemical Adsorbate Effects on Blue and Red Emitting Porous Silicon Samples. MRS Online Proceedings Library 358, 393 (1994). https://doi.org/10.1557/PROC-358-393

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  • DOI: https://doi.org/10.1557/PROC-358-393

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