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Electronics Engineering / Semiconductor Physics

Space Charge Region at a Junction

Space Charge Region at a Junction: As explained already, the interface separating the N and P-regions is called the metallurgical junction. Let us consider a step junction in which the doping concentration is uniform in…

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July 1, 2022
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Electronics Engineering / Semiconductor Physics

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…

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July 1, 2022
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Electronics Engineering / Semiconductor Physics

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…

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July 1, 2022
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Electronics Engineering / Semiconductor Physics

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…

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July 1, 2022
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Electronics Engineering / Semiconductor Physics

What is Hall Effect in Semiconductor?

What is Hall Effect in Semiconductor?: When a specimen (metal or semiconductor) is placed in a transverse magnetic field and a direct current is passed through it, then an electric field is induced across its…

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July 1, 2022
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Electronics Engineering / Semiconductor Physics

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…

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July 1, 2022
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Electronics Engineering / Semiconductor Physics

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…

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July 1, 2022
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Electronics Engineering / Semiconductor Physics

Fermi Level in Extrinsic Semiconductor

Fermi Level in Extrinsic Semiconductor: The equation for f(E) specifying the fraction of all states at energy E (electron volts) occupied under conditions of thermal equilibrium is called the Fermi-Dirac probability function and is given…

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June 30, 2022
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Electronics Engineering / Semiconductor Physics

Carrier Concentration in Intrinsic Semiconductor

Carrier Concentration in Intrinsic Semiconductor: For determination of the conductivity of a semiconductor, it is essential to know the Carrier Concentration in Intrinsic Semiconductor of free electrons in conduction band and concentration of holes in…

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June 30, 2022
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Electronics Engineering / Semiconductor Physics

Explain Conduction in Intrinsic Semiconductors

Explain Conduction in Intrinsic Semiconductors: Explain Conduction in Intrinsic Semiconductors - As already explained, conduction through a semiconductor is due to two mechanisms viz. drift and diffusion. The movement of charge carriers (electrons and holes)…

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June 30, 2022
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