1) Using M/S energy band diagrams, determine if Nickel (5.2 eV
workfunction) or Indium (4.1 eV...
1) Using M/S energy band diagrams, determine if Nickel (5.2 eV
workfunction) or Indium (4.1 eV workfunction) can be used to make a
Schottky diode on n-Si doped 3x1016/cm3
1) Calculate the energy, in units of Joules and eV, and
momentum, in kg*m/s and eV/c, for a photon with wavelengths of: a)
1.5 pm, b) 120 nm, and c) 21.4 cm.
A simple insulator has a band gap of 4.0 eV, and the Fermi
energy may be taken to reside in the middle of the gap. Estimate
the probability of an electron at room temperature being in the
conduction band.
Question 1
Which of the following is true about energy band diagrams?
Select one:
a. Electron energy increases as you go down in an energy band
diagram
b. Hole energy increases as you go up in an energy band
diagram
c. Electron energy below Ec and hole energy above Ev is in the
form of kinetic energy
d. Both electrons and holes seek the lowest possible energy
level
e. All of these
Q2
In a semiconductor “dopant compensation” refers to...
Sketch the energy band diagrams for metals, insulators and
semiconductors and explain the how they differ based on the
bandgap, density of states and conductivity.
1. Calculate the permeability of electrons with energy of 0.1 eV
and 0.5 eV respectively when penetrating a positional energy
barrier of 1.0 eV in height and 100 pm in length by tunnel
phenomenon.
k Attachment image=[2m(V-E)]^1/2
T={1+(e^kL-e^-kL)^2/16ε(1-ε)}^-1 (ε= E/V)
2. Explain the meaning of tunneling covered in the above problem
with the wave and explain the difference between classical and
quantum mechanics based on it.
A crate is given a push such that it has an initial speed of 5.2
m/s headed up a 15 degree incline. If the crate travels 3.5m up the
incline before reversing direction, what is the coefficient of
kinetic friction between the crate and the incline?
An eagle is flying horizontally at 5.2 m/s with a fish in its
claws. It accidentally drops the fish. (a) How much time passes
before the fish's speed quadruples? (b) How much additional time
would be required for the fish's speed to quadruple again?
A volleyball is spiked so that its incoming velocity of +4.1 m/s
is changed to an outgoing velocity of -16 m/s. The mass of the
volleyball is 0.34 kg. What impulse does the player apply to the
ball?
____ kg·m/s
The energy of formtion of a vacancy in the copper crystal is
about 1 eV. Calculate the concentration of vacancies at room
temperature (300K) and just below the melting temperature,
1084oC. The atomic mass of Cu is Mat =
63.54g*mol-1 and the density at 293 K is
8.96cm-3. Neglect the change in the density which is
small.
1. The binding energy of the photoelectrons of a surface is 1.8
eV. Blue light of wavelength 4.8 x 10^-7 m falls on the
surface.
Find
a) kinetic energy of the ejected photoelectrons in eV,
b) the voltage required to stop the photoelectrons from leaving
the surface.