Charge carrier denotes in physics a free (mobile, unbound) particle carrying an electric charge. Examples are electrons and ions. In semiconductor physics, the travelling vacancies in the valance-band electron population (holes) are treated as charge carriers. The willingness to question previously held truths and search for new answers resulted in a period of major scientific advancements, now known as the Scientific Revolution. ... Electric charge is a fundamental FATTY STASHEconserved property of some subatomic particles, which determines their electromagnetic interactions. ... Charge is a word with many different meanings. ... Properties The electron is a subatomic particle. ... An ion is an elementary particle or system of elementary particles with a net electric charge. ... A semiconductor is a material that is an insulator at very low temperature, but which has a sizable electrical conductivity at room temperature. ... In solid state physics, an electron hole (usually referred to simply as a hole) is the absence of an electron from the otherwise full valence band. ...

In ionic solutions, the charge carriers are the dissolved cations and anions. Similarly, cations and anions of the dissociated liquid serve as charge carriers in liquids and melted ionic solids (see eg. the Hall-Heroult process for an example of electrolysis of a melt). A cation is an ion with positive charge. ... An anion is an ion with negative charge. ... The Hall-Heroult process is the major industrial process for the production of aluminum. ...

In plasma, eg. in an electric arc, the electrons and cations of ionized gas and vaporized material of electrodes act as charge carriers. (The electrode vaporization occurs in vacuum too, but then the arc is not technically occuring in vacuum, but in low-pressure electrode vapors.) The word plasma has a Greek root which means to be formed or molded (the word plastic shares this root). ... An electric arc can melt calcium oxide. ...

In vacuum, in an electric arc or in vacuum tubes free electrons act as charge carriers. See vacuum cleaner for information on the home appliance. ... A vacuum arc arises when the surface of metal electrodes in contact with a good vacuum begin to emit electrons because of heating or through exceeding the metals Work function. ... In electronics, a vacuum tube (American English) or (thermionic) valve (British English) is a device generally used to amplify a signal. ...

In metals, the charge carriers are the electrons forming the Fermi gas in the metal lattice. Hot metal work from a blacksmith In chemistry, a metal (Greek: Metallon) is an element that readily forms ions (cations) and has metallic bonds, and metals are sometimes described as a lattice of positive ions (cations) in a cloud of electrons. ... A Fermi gas is a collection of non-interacting fermions. ...

Majority and minority carriers in semiconductors

In semiconductors, electrons and holes act as charge carriers. The more abundant charge carriers are called majority carriers. In N-type semiconductors they are electrons, in P-type semiconductors they are holes. The less abundant charge carriers are called minority carriers; in N-type semiconductors they are holes, in P-type semiconductors they are electrons. An N-type semiconductor is obtained by carrying out a process of doping, that is adding a certain type of atoms to the semiconductor in order to increase the number of free (in this case negative) charges. ... Properties The electron is a subatomic particle. ... A P-type semiconductor is obtained by carrying out a process of doping, that is adding a certain type of atoms to the semiconductor in order to increase the number of free (in this case positive) charges. ... In solid state physics, an electron hole (usually referred to simply as a hole) is the absence of an electron from the otherwise full valence band. ...

Minority carriers play important role in bipolar transistors. However, they play no role in MOSFET transistors. The schematic symbols for PNP- and NPN- type BJTs. ... The MOSFET, or Metal-Oxide-Semiconductor Field-Effect Transistor, is by far the most common field effect transistor in both digital and analog circuits. ...

When an electron meets with a hole, they recombine and vanish. The energy released can be either thermal, heating up the semiconductor (thermal recombination, one of the sources of waste heat in semiconductors), or released as photons (optical recombination, used in LEDs and semiconductor lasers. The photon can be perceived as a wave or a particle, depending on how it is measured In physics, the photon (from Greek φοτος, meaning light) is a quantum of the electromagnetic field, for instance light. ... Various light-emitting diodes (5 mm reds, 3 mm greens and yellows) A light-emitting diode (LED) is a semiconductor device that emits incoherent monochromatic light when electrically biased in the forward direction. ... A laser diode is a laser where the active medium is a semiconductor p-n junction similar to that found in a light-emitting diode. ...