hard silicon emit light
In other words, hard silicon emit light. This property causes the silicon devices are not suitable as photonic / optoelectronic, so it is also possible for example to make the IC in which are optoelectronic detector or a light source pemamcar using only the silicon material alone. Several attempts have been made ??to overcome this, among others, by developing what is known as band gap engineering. One example is to grow the material structure of SiGe / Si superlattice layer straitned. Parameters of mechanical strains arising due to differences between the crystal lattice constant of SiGe and Si layers will affect the electronic structure of materials at the top so that it appears brillioun-zone folding effects that alter the structure of ribbon-like material with a direct energy gap (direct band gap). The combination of both materials allows the transmission and absorption of light. Another popular way to improve the optical properties of silicon is the so-called porous silicon material. By dissolving electrochemically, on a silicon plate can be shaped holes measuring tens of angstroms. With the help of a laser beam, will be seen with the naked eye from the light transmitting material is silicon. This phenomenon can be explained using a model of two-dimensional quantum confinement. The drawback of this technique is the nature of its low reproducibility. Progress on opening a new era for silicone materials and guidelines to be applied to the device optoelektronika.