Semiconductor Physics

Metal Semiconductor Junctions

Metal Semiconductor Junctions: Metal semiconductor junctions are very common in all semiconductor devices and are very important. Depending upon the doping concentration, materials, and the characteristics of the interface, the metal semiconductor junctions can act as either an ohmic contact or as a Schottky barrier. Structure of Metal Semiconductor Junctions: A metal-semiconductor junction, as its …

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Charge Neutrality Equation in Semiconductor

Charge Neutrality Equation in Semiconductor: The semiconductor crystal is electrically neutral under thermal equilibrium conditions. The electrons are distributed among the different energy states, producing both negative and positive charges but the net charge density is zero. This charge neutrality condition is used for determination of the thermal-equilibrium electron and the hole concentrations as a …

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Equilibrium Conditions in Semiconductor Physics

Equilibrium Conditions in Semiconductor Physics: The electron and hole concentrations, under thermal Equilibrium Conditions can be found by knowing the position of the Fermi energy EF with respect to the bottom of the conduction band energy EC and top of valence band energy EV. As discussed already, in case of an intrinsic semiconductor, the Fermi …

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Basic Structure of PN Junction in Semiconductor

Basic Structure of PN Junction in Semiconductor: Most semiconductor devices employ one or more P-N junctions. The P-N junction is the control element for the performance of all semiconductor devices such as rectifiers, amplifiers, switching devices, linear and digital integrated circuits. The PN Junction in Semiconductor is produced by placing a layer of P-type semiconductor …

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Continuity Equation in Semiconductor

Continuity Equation in Semiconductor: The Continuity Equation in Semiconductor states a condition of dynamic equilibrium for the concentration of mobile carriers in any elementary volume of the semiconductor. In Fig. 6.21 we have seen that on disturbing the equilibrium concentrations of carriers (electrons and holes) in a semiconductor, the concentrations of holes or electrons vary …

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Carrier Lifetime in Semiconductor

Carrier Lifetime in Semiconductor: As already explained, in an extrinsic semiconductor the number of holes is equal to the number of free electrons. Due to thermal agitation, new electron-hole pairs are continually generated while other electron-hole pairs disappear as a result of recombination i.e., free electrons falling into empty covalent bonds. On an average, a …

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