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  • 1
    Electronic Resource
    Electronic Resource
    Post-anodization filtered illumination of porous silicon in HF solutions: An effective method to improve luminescence properties (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1656-1658 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A useful method is presented to improve the luminescence efficiency of porous silicon (PS) based on the post-anodization illumination of samples in HF solutions. In the present method the illumination is performed by a white lamp through sharp-cut long-wavelength-pass filters to remove the short wavelength component from the illumination light. The PS samples prepared by this method exhibited the visible photoluminescence (PL) with an efficiency of one order of magnitude higher than those illuminated without filters. The efficiency improvement is attributed to the reduction of the deteriorative surface oxidation of Si crystallites in PS. The filtered illumination technique is also useful to produce a larger PL blue shift and precise control of PL spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112946
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  • 2
    Electronic Resource
    Electronic Resource
    Control of structure and optical anisotropy in porous Si by magnetic-field assisted anodization (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3206-3208 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of an applied magnetic field during anodization on the structural and optical isotropy of luminescent porous silicon (PS) are investigated. The PS layers are prepared by anodizing p-type Si wafers in HF solutions with an external magnetic field of 0–1.7 T applied perpendicular to the Si surface. It is shown that the photoluminescence intensity of PS significantly increases with increasing magnetic field. This effect is accompanied by an increase in both the porosity and the optical isotropy without affecting the surface chemical composition. The structural uniformity in the PS layer and at the PS-substrate interface are also improved. These results suggest that an external magnetic field during anodization regulates the supply of holes from the substrate and produces well-controlled optical and structural properties of PS. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117962
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