Question

Define the limitations in the operation conditions of a p-n junction

Answer #1

The p-n junction diode will perform satisfactorily only if it is operated within certain limiting values or conditions.

They are :

1. Maximum forward current : it is the highest instantaneous current under forward bias.

2.Peak inverse voltage: The maximum value of the reverse voltage that a PN junction or diode can withstand without damaging itself is known as its Peak Inverse Voltage.

3.Maximum power rating: it is the maximum power that can be dissipated at the junction without damaging it.

(4) Which of the following cannot form a near-ohmic contact?
( )
(A) p-n junction
(B) n-n+ junction
(C) p-p+ junction
(D) Semiconductor-metal junction

Differentiate between extrinsic n-type and p-type
semiconductors; discuss their importance in a p-n junction
diode.

Imagine a solar cell where the p-n junction diode is kept in
the sun. Upon absorbing su light, electron hole pairs are generated
inside the depletion region around the junction.
You have a Silicon p-n junction diode where the Fermi energy
on the p-doped side is 0.02 ev above the upper edge of the valence
band and the Fermi energy is 0.01 eV below the lower edge of the
conduction band in the n-doped side. The band gap in Silicon...

In a p+-n junction at room temperature, the n-doping
ND is doubled. How do the following two parameters
change if everything else is unchanged?
Break down Voltage
Built-in Voltage

What are the possible temperature effects on the
forward and reverse-bias currents in a p-n junction? Explain
clearly.

Suppose that a p-n junction at equilibrium is short circuted
with metallic wire. Could the contact potential of the junction
drive an electric current in the circuit? Explain. Draw appropriate
energy-band diagram for the whole circuit. (I really need the
drawing, thanks)

Sketch the equilibrium band structure of a P+N junction and, in
point form, explain why this structure
predicts the rectification characteristic associated with
diodes.

1. with the aid of a diagram explain how P-N junction
is formed
2. Explain what carrier mobility is and elaborate on the factors
that influence carrier mobility

Let X Geom(p). For positive integers n, k define
P(X = n + k | X > n) = P(X = n + k) / P(X > n) :
Show that P(X = n + k | X > n) = P(X = k) and then briefly
argue, in words, why this is true for geometric random
variables.

For each set of conditions below, give an example of a predicate
P(n) deﬁned on N that satisfy those conditions (and justify your
example), or explain why such a predicate cannot exist.
(a) P(n) is True for n ≤ 5 and n = 8; False for all other
natural numbers.
(b) P(1) is False, and (∀k ≥ 1)(P(k) ⇒ P(k + 1)) is True.
(c) P(1) and P(2) are True, but [(∀k ≥ 3)(P(k) ⇒ P(k + 1))] is
False....

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