Crystallite-size-dependent characteristics of porous silicon

Fabrication and size dependent properties of porous silicon nanotube arrays.

A general method for the formation of a broad family of silicon nanotube arrays (Si NTAs) relevant to diverse fields--ranging from energy storage to therapeutic platforms--is described. Such nanotubes demonstrate a thickness-dependent dissolution behavior important to its potential use in drug delivery. Under selected conditions, novel porous silicon nanotubes can be prepared when the shell thi...

Biomolecule size-dependent sensitivity of porous silicon sensors

A model of size-dependent photoluminescence in amorphous silicon nanostructures: Comparison with observations of porous silicon

We present calculations using a simple model of radiative recombination in 2D slabs, 1D wires, and 0D spheres of hydrogenated amorphous silicon ~a-Si:H! showing a significant size dependence of the photoluminescence. Room-temperature peak emission energies .1.8 eV and efficiencies near unity are possible in a-Si:H spheres with diameters ,20 Å. Broad homogeneous linewidths .0.25 eV are also pred...

Crystallite Size Measurement Using X- Ray Diffraction

Mike Meier University of California, Davis September 13, 2004 Figure 1. FEG-SEM image of nanosized aluminum oxide powder. Note the magnification and the size of the micron bar. Also note how the smaller particles and the edges of the larger particles appear to be somewhat transparent. This is because much of the 5 kV electron beam can pass through these thinner parts of the particles. CRYSTALLI...

Effect of Silicon Nanowire on Crystalline Silicon Solar Cell Characteristics

Nanowires (NWs) are recently used in several sensor or actuator devices to improve their ordered characteristics. Silicon nanowire (Si NW) is one of the most attractive one-dimensional nanostructures semiconductors because of its unique electrical and optical properties. In this paper, silicon nanowire (Si NW), is synthesized and characterized for application in photovoltaic device. Si NWs are ...