Explain the role of forward resistance in PN junction
diode . Differentiate the approximate and simplified...
Explain the role of forward resistance in PN junction
diode . Differentiate the approximate and simplified diode models
on the basis of forward resistance.
The forward current across the depletion layer of a PN junction
diode consists of electrons
from Ν to Ρ and holes injected from Ρ to N. The ratio of the hole
current crossing
the junction to the total current is known as the injection
efficiency. Determine an
expression for the injection efficiency as a function of:
a) Na/Nd.
b) The ratio of the conductivity of Ρ to that of N.
Assume τp = Ο.1τn , and μp = 2.5
μn...
Question 5: pn junction
(a) Explain the main physical principles underlying the
operation of a pn-junction-based diode.
(b) Provide a rigorous derivation of the net current through the
pn-junction for both the forward and reverse bias. Explain and
justify every step in your derivation.
(c) For a fixed temperature, plot the net current as a function
of applied voltage.
1.pn junction when forward bias is applied
Draw the energy band diagram.
Explain all the quasi fermi levels in the depletion region and why
they are so drawn.
2.pn junction when reverse bias is applied
Draw the energy band diagram.
Explain all the quasi fermi levels in the depletion region and why
they are so drawn.
Explain how a pn junction creates the appropriate response of
the system to explain Isc
and Voc. (Start from incoming
photons and explain short and open circuits seperately).
Explain how a pn junction creates the appropriate conditions for
absoring a photon and then keeping the electron-hole pair around
around long enough to be collected. (Explain the steps from
incoming photon to the end.)
Explain why the width of a pn junction can be manipulated by an
external volatge. Determine the polarity of the external voltage if
one wants to increase the width of the pn-junction.
Explain the process of forward and reverse transport of fatty
acids and cholesterol and the role of cholesterol in the regulation
of the transcription of the LDL receptor gene. Your answer should
describe the relevant apolipoproteins and receptors
What is the role of time value of money in finance?
Explain.
Differentiate between FV & PV of single amounts, annuities,
& uneven cash flow patterns.
Identify the steps involved in determining rate of return or
interest rate between PV & FV.