Radiative Lifetime And Internal Quantum Efficiency Of Small Scale Silicon Nanostructures

Nanosilicon (nanocrystal and porous) research is gaining tremendous attention in recentrnyears due to the light emitting properties of the material. Improving efficiencies in radiativernrecombination and light extraction of this material enhances potential applications asrnmicroelectronic and optoelectronic devices with new operational capabilities. In this workrnwe investigate the influence of quantum confinement and excitation laser pump flux onrnthe optical parameters of silicon nanocrystal. Our work presents a new approach for thernphotoluminescence mechanism of silicon nanocrystal by using phenomenological formulationsrnthat explain the size and laser pump flux dependence of photoluminescence intensity,rnradiative lifetime and internal quantum efficiency. To investigate the mechanism of thernphotoluminescence we perform computer simulation using fortran programming. Thesernresults show that, miniaturizing the size and increasing laser pump flux strongly altersrnphotoluminescence intensity, radiative lifetime and internal quantum efficiency of siliconrnnanocrystal. Our results have in well agreement with many other theoretical and experimentalrnfindings. Our model confirms photoluminescence emission intensity and internalrnquantum efficiency enhance due to quantum confinement and we can tune the emissionrnspectral range across the visible by using proper sized silicon nanocrystal

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