What is heterojunction?
Heterojunction is formed when two different layers of crystalline semiconductors are located in conjunction or layering together with alternating or different gaps of the band. Heterojunction, mostly used in electrical equipment in solid state, can also be created between two semiconductors with different properties such as crystalline, while the other is metal. If the function of an electrical device or device depends on more than one heterojunction, they are placed in the formation to create what is called heterostructure. These heterostructures are used to increase energy produced by various electrical devices such as solar cells and lasers.
There are three different types of heterojunction. When these interfaces are created between semiconductors, what is called a straddled gap, unfolded gap or a broken gap. These different types of heterojunction depend on the energy gap, which is created as a result of a specific Semiconductor materials.
the amount of energy that canIt is directly relevant to the size of the energy gap created by heterojunction. The type of energy gap is also important. This energy gap consists of a difference that lies between the valence zone, which is produced by one semiconductor and a conductive band produced by the other.
Heterojunks are standard in every laser made because science of heterojunks has become the standard in the whole industry. Heterojunction allows lasers that are able to function at normal room temperature. This science was first introduced in 1963 Herbert Kroemer, although it did not become a standard science in the laser production industry only a few years later, when real material science caught up with basic technology.
Today, heterojunctions are a vital element that every laser, from cutting lasers in CNC machines to lasers that read DVD movies and compact sounddiscs. Heterojunction is also used in high -speed electronic devices that work at very high frequencies. An example is a transistor with high mobility of electrons, which operates most of its functions at more than 500 GHz.
The production of many heterojunctions is now performed by an accurate process known as CVD or the deposition of chemical pairs. MBE, which means epitaxes of molecular beam, is another process used for heterojunctions manufacturer. Both of these processes are very accurate and very expensive to carry out, especially in comparison with the predominantly outdated process of silicone production of semiconductor equipment, although silicon production is still popular in other applications.