Spectroscopic Aspects of Gradient-Porosity System
Journal Title: International Journal of Engineering Sciences & Research Technology - Year 30, Vol 3, Issue 7
Abstract
Laser-assisted etching process with the illumination of short laser wavelength of 405nm has been used to prepare efficient and thin layers of gradient- porosity porous silicon (GPSi) by employing two techniques; a stepgradient etching current and step- laser power density. From the spectroscopic aspects of (GPSi), it has been found that a very low reflectivity at wavelengths 400 nm and 850 nm was obtained as compared with a single layer –porous silicon. The photoluminescence study aided by scanning electron microscopy has revealed multi- peak photoluminescence (PL) emissions spectra of (GPSi) with peak intensity higher than that of Psi due to the gradient porosity inside the porous layer. These (PL) peak positions refer to porous system with multi energy band gaps compared with single energy band gap of the (Psi) layer. The SEM images indicated a pore-like structure of the surface of the etched layer with different pore sizes and porosities.
Authors and Affiliations
E. M. Abdelrazek,
Keywords
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