Fractal Microstructures of Porous Silicon and Its Photoluminescence
多孔硅的分形结构及其荧光特性

Using scanning electron microscopy (SEM) and computer simulation,the microstructures of porous silicon have been studied.The results show that the microstructures of porous silicon exhibit fractal characteristics.Characterized with spectrophotometer,the excitation-wavelength dependent photoluminescence of porous silicon has been investigated,and the optical results have demonstrated that the photoluminescence spectrum of porous silicon blue shifts continuously from 780 to 500 nm when the excitation wavelength decreases from 650 to 340 nm.The excitation-wavelength tunable photoluminescence of porous silicon can be interpreted in terms of the quantum confinement effect and the fractal microstructures of porous silicon.