In fact, since the y-axis of figure A is log-scale, the region is almost completely depleted of majority carriers leaving a charge density equal to the net doping level , and the edge between the space charge region and the neutral region is quite sharp see figure B , Q x graph. In forward bias, the p-type is connected with the positive terminal and the n-type is connected with the negative terminal.
Encyclopedia article about material. What made you want to look up material? Please tell us where you read or heard it including the quote, if possible. Test Your Knowledge - and learn some interesting things along the way. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! A look at its gassy origins. Smart advice on modifying adjectives. If you need a reminder. And is one way more correct than the others?
The story of an imaginary word that managed to sneak past our editors and enter the dictionary. How to use a word that literally drives some people nuts.
The awkward case of 'his or her'. Words to improve your Scrabble game. Test your vocabulary with our question quiz! Adjective big , consequential , earth-shattering , earthshaking , eventful , historic , important , major , meaningful , momentous , monumental , much , significant , substantial , tectonic , weighty Synonyms: Noun accoutrements or accouterments , apparatus , equipment , gear , hardware , matériel or materiel , outfit , paraphernalia , stuff , tackle Antonyms: Adjective inconsequential , inconsiderable , insignificant , little , minor , negligible , slight , small , trifling , trivial , unimportant Visit the Thesaurus for More.
Choose the Right Synonym for material Adjective material , physical , corporeal , phenomenal , sensible , objective mean of or belonging to actuality. Examples of material in a Sentence Adjective He is concerned only with his own material comforts. The members of the board felt that she was vice-presidential material. Of, relating to, or composed of matter. Of, relating to, or affecting physical well-being; bodily: Of or concerned with the physical as distinct from the intellectual or spiritual: Being both relevant and consequential; crucial: See Synonyms at relevant.
Philosophy Of or relating to the matter of reasoning, rather than the form. Philosophy philosophy composed of or relating to physical as opposed to mental or spiritual substance: Philosophy philosophy of or relating to matter as opposed to form.
Law law relevant to the issue before court: Switch to new thesaurus. Aertex - a trademark for a loosely woven cotton fabric that is used to make shirts and underwear.
Canton flannel , cotton flannel - a stout cotton fabric with nap on only one side. That from which things are or can be made: In forward bias, the p-type is connected with the positive terminal and the n-type is connected with the negative terminal. With a battery connected this way, the holes in the p-type region and the electrons in the n-type region are pushed toward the junction and start to neutralize the depletion zone, reducing its width.
The positive potential applied to the p-type material repels the holes, while the negative potential applied to the n-type material repels the electrons. The change in potential between the p side and the n side decreases or switches sign. With increasing forward-bias voltage, the depletion zone eventually becomes thin enough that the zone's electric field cannot counteract charge carrier motion across the p—n junction, which as a consequence reduces electrical resistance.
Electrons that cross the p—n junction into the p-type material or holes that cross into the n-type material diffuse into the nearby neutral region. The amount of minority diffusion in the near-neutral zones determines the amount of current that can flow through the diode.
Only majority carriers electrons in n-type material or holes in p-type can flow through a semiconductor for a macroscopic length. With this in mind, consider the flow of electrons across the junction. The forward bias causes a force on the electrons pushing them from the N side toward the P side.
With forward bias, the depletion region is narrow enough that electrons can cross the junction and inject into the p-type material. However, they do not continue to flow through the p-type material indefinitely, because it is energetically favorable for them to recombine with holes.
The average length an electron travels through the p-type material before recombining is called the diffusion length , and it is typically on the order of micrometers.
Although the electrons penetrate only a short distance into the p-type material, the electric current continues uninterrupted, because holes the majority carriers begin to flow in the opposite direction. The total current the sum of the electron and hole currents is constant in space, because any variation would cause charge buildup over time this is Kirchhoff's current law. The flow of holes from the p-type region into the n-type region is exactly analogous to the flow of electrons from N to P electrons and holes swap roles and the signs of all currents and voltages are reversed.
Therefore, the macroscopic picture of the current flow through the diode involves electrons flowing through the n-type region toward the junction, holes flowing through the p-type region in the opposite direction toward the junction, and the two species of carriers constantly recombining in the vicinity of the junction. The electrons and holes travel in opposite directions, but they also have opposite charges, so the overall current is in the same direction on both sides of the diode, as required.
The Shockley diode equation models the forward-bias operational characteristics of a p—n junction outside the avalanche reverse-biased conducting region.
Connecting the p-type region to the negative terminal of the battery and the n-type region to the positive terminal corresponds to reverse bias.
If a diode is reverse-biased, the voltage at the cathode is comparatively higher than at the anode. Therefore, very little current flows until the diode breaks down. The connections are illustrated in the adjacent diagram. Because the p-type material is now connected to the negative terminal of the power supply, the ' holes ' in the p-type material are pulled away from the junction, leaving behind charged ions and causing the width of the depletion region to increase.
Likewise, because the n-type region is connected to the positive terminal, the electrons are pulled away from the junction, with similar effect. This increases the voltage barrier causing a high resistance to the flow of charge carriers, thus allowing minimal electric current to cross the p—n junction. The increase in resistance of the p—n junction results in the junction behaving as an insulator. The strength of the depletion zone electric field increases as the reverse-bias voltage increases.
A p–n junction is a boundary or interface between two types of semiconductor materials, p-type and n-type, inside a single crystal of semiconductor. The "p" (positive) side contains an excess of holes, while the "n" (negative) side contains an excess of electrons in . Material icons are delightful, beautifully crafted symbols for common actions and items. Download on desktop to use them in your digital products for Android, iOS, and web. Nitrile rubber, also known as NBR, Buna-N, and acrylonitrile butadiene rubber, is a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene. Trade names .