Porous silicon has been used in many applications such as light-emitting materials in optoelectronics, bone growth media, gas and humidity sensors, sacrificial layers in micromachining, surface texturization in photovoltaics or substrate material in mass spectrometry. Also it is important in the industries of solar cells and diffusion membrane. Formation of porous silicon can be carried out by chemical etching, photo-etching, stain etching in presence of oxidizing agent, metal-assisted etching and anodic etching.

Awad Sadek Mogoda Prof. of physical chemistry in the chemistry department,faculty of science, Cairo University. Ph D.physical chemistry in 1986.He interests in the studies of the corrosion inhibition of metals and alloys,preparation of thin solid films,superconductors preparations,dies water treatment of textile and nanoporous silicon preparations.