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QUESTION: 1

What does p/τ represent?

Solution:

Option (c) represents the holes per second lost by recombination per unit volume.

QUESTION: 2

Which of the following is the Taylor’s expression?

Solution:

Option a represents the correct formula for the Taylor’s expression.

QUESTION: 3

Calculate the number of coulombs per second if the area is 4cm^{2}, recombination rate of hole is 1000 cm^{-3}/s and the differential length is 2mm.

Solution:

number of coulombs per second= eAdxp/τ

=1.6*10^{-19}*4*10^{-4}*2*10^{-3}*1000

=1.28*10^{-22}.

QUESTION: 4

The current entering the volume at x is I and leaving is I+Δi , the number of coulombs per second will be equal to δI. Is it true or false?

Solution:

Coulombs per second is known as the current. The differential current will be the current through the semiconductor.

QUESTION: 5

The change in the carrier density is due to

Solution:

The change in the carrier density describes the continuity equation which is equal to the difference between the incoming and outgoing flux plus generation and minus recombination.

QUESTION: 6

What of the following conditions satisfies when the number of holes which are thermally generated is equal to the holes lost by recombination?

Solution:

Under the equilibrium conditions, I will be zero and then the dp/dt will aso be equal to zero in the continuity equation. Then, g= p/τ is left which is option c.

QUESTION: 7

What is the diffusion length for holes when Dp=25cm^{2}/s and τ_{p}=25s?

Solution:

L_{p}=√(D_{p}*τ_{p})

=√(25*25)

=25cm.

QUESTION: 8

Which of the following represents the continuity equation?

Solution:

Option a represents the correct equation of the continuity equation for holes.

QUESTION: 9

What is the diffusion length for electrons when Dn=10cm^{2}/s and τ_{n}=40s?

Solution:

L_{n}=√(D_{n}*τ_{n})

=√(10*40)

=20cm.

QUESTION: 10

Which of the following represents the best definition for the diffusion length for holes?

Solution:

Diffusion length for holes is represented as the average distance which a hole is injected travels before recombining with an electron. It is the distance into the semiconductor at which the injected concentration falls to 1/ϵ of its value at x=0.

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