Spatially resolved cathodoluminescence (CL) spectra were measured on porous silicon. The CL spectra showed bands and prominent peaks ranging in energy between 1.45 eV and 3 eV and were unlike the photoluminescence spectra measured on the same samples, which consisted of the well known single, broad band peaking in the visible or near infrared region. Two possible models are discussed to explain these observations.
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Pillai et al. (1992) studied this question.
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