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calculate the intrinsic carrier density.

Define drift current, diffusion current and P-N junction. The electrical conductivity of a pure silicon at room temperature is 4×10(4)mho/m . if the mobility of electron is 0.14m2/VS and that of hole is 0.04m2/VS.

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DRIFT CURRENT :-

Drift current is the electric current, or movement of charge carriers, which is due to the applied electric field, often stated as the electromotive force over a given distance.

DIFFUSION CURRENT:-

Diffusion current is a current in a semiconductor caused by the diffusion of charge carriers. This is the current which is due to the transport of charges occurring because of nonuniform concentration of charged particles in a semiconductor.

P-N JUNCTION:-

A diode is a PN junction with p-type on one side and n-type on the other. When a positive voltage is applied to the p-type side , it shrinks and overcomes the depletion zone, causing the current flow from the p-type to the n-type side.

NUMERICAL:-

Given Data :-σ=4×10(4)mho/m,μe=0.14m2/Vsec,μh=0.04m2/VS

Formula :- σi=ni(μe+μh).e

Calculations :- ni=σi/((μe+μh).e)

=(4×10(4))/(1.6×10(19)(0.14+0.040))

ni=1.388×1016/m3

Answer :- carrier concentration = 1.388×1016/m3

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