Function introduction of semiconductor discharge tube
Today Shenzhen tage electronic technology in this small series for the majority of technical engineers to introduce and explain the function of the semiconductor discharge tube, so that we can have a better understanding of semiconductor discharge tube! We all know that in a semiconductor discharge tube, the structure of the atom is very special, and the binding of the valence electrons is stronger than the conductor, and is weaker than the insulating body. Therefore, semiconductor discharge tubes are neither good conductors nor insulators. Why does the semiconductor discharge tube cause great interest? The reason is not that its conductivity is between conductor and insulator, but that it has unique properties. It is found that when the semiconductor discharge tube is excited by the external light and heat, the electrical conductivity of the semiconductor will change greatly. More prominent is that in pure semiconductor discharge tube doped with trace impurities, the conductivity of the semiconductor discharge tube will be greatly enhanced. These characteristics indicate that the conduction principle of the semiconductor discharge tube is different from other substances. Speaking of conductive law following Shenzhen tage of electronic technology small from the semiconductor discharge tube. The commonly used semiconductor discharge tube material is silicon germanium (Si) and (Ge), which is a tetravalent element figure 1 shows the schematic structure of silicon single crystal. The two adjacent atoms in the graph form a covalent bond by a pair of common electrons, when the temperature is low to absolute zero. In the absence of external light or heat emission, the electron in the covalent bond is a binding electron, which can not move freely, which is equivalent to insulators and can not conduct electricity. However, this constraint is not very strong. Under normal temperature, a small number of valence electrons are heated or illuminated to excite enough energy to break free and become free electrons. In the absence of an external electric field, the movement of these electrons is irregular. When there is an external electric field, these electrons move against the direction of the electric field to form a current, which is called electronic conduction.
When a valence electron is free from being bound into a free electron, a vacancy is left in the original position, which is called a hole. The appearance of holes is an important feature of the semiconductor discharge tube, which is different from other conductors.
Free electrons are negatively charged particles, and holes can be regarded as positive particles. They are all carriers. The current in the circuit is composed of two parts. Under the action of the external electric field, the movement of free electrons is opposite to the direction of the hole movement, but the direction of the current is the same.
A good introduction to this function and so on this semiconductor discharge tube end, if some engineers discharge what do not know where or when the selection difficult choices of semiconductor, please contact our Shenzhen electronic technology website online from the manager or sales manager to recommend you for your semiconductor discharge tube!