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Friday, March 14, 2008

NANOSTRUCTURED MATERIAL PREPARED

Nanostructured Porous Silicon (NPSi) has a great potential in a wide range of
Fields due to the optical properties. Nanostructured porous silicon (NPS) is described simply
As a network of silicon-nanometer-sized regions surrounded by space1 void. NPSi as
In other porous material can be expected to have fractal properties. Is a NPSi
Material, which has been almost 50 years, but intense study since
Canham (1990) 2 observed a visible luminescence of NPSi. Luminescence of NPSi
Observed was founded more than ten years ago, and since that time, the scientists struggling to develop
A mechanism to describe its physical properties 1 photo. Despite the lack of consistent
Physical description, a large number of test devices were produced, the
Tunable high luminosity and an area of NPSi 3rd Photoluminescence (PL)
Mechanism of the light emitting material by light excitation. It is the most important
A characteristic of the most important, because NPSi study of porous silicon is the nanostructure
Determine the nature of the luminescence. Emission spectra of PS are usually a peak in the
Range of 600 to 800 nm (1.5-2.0 eV), depending on the production, stockpiling, agitation
State and others3. The luminescence mechanism is not known, and is
After extensive investigations. These models are the quantum confinement effect2,
State model4 surface, silicon-based connection (siloxane) 5, amorphous silicon6 and others.
Some devices have the application include: molecular sensors, pressure cavity laser,
LEDs, optical switches, photovoltaic cells and high field electron sources.
Development of equipment of this kind require a detailed understanding of
Luminescence properties of nanostructured materials.

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