EE 2212
QUIZ 3
S. G. Burns
30 September 2015
Name:_______________________
Name:____________________
NOTE: GOOD IDEA TO USE THE GRAPHS ON THE CLASS WEB PAGE!!!
Problem 1 (54 Points, 6 Points Each points) Semiconductor Pot-Pourri
(a) Silicon is in Column (III, IV, V) of the Periodic Table which means there are (3, 4, 5) outer shell electrons
available for forming (IONIC, COVALENT, NUCLEAR) bonds with other Si or perhaps dopant atoms in a
crystal lattice.
(b) At T = 0K, the intrinsic carrier density in Si is (∞, 0, 1.5 x 1010, 5 x 1022) cm-3 and at T = 300K the intrinsic
electron concentration of Si is (∞, 0, 1.5 x 1010, 5 x 1022) cm-3 and the intrinsic electron concentration is
(LARGER ABOUT THE SAME, SMALLER) than the intrinsic hole concentration. Circle your choices.
(c)
The intrinsic charge carrier concentration becomes (LARGER, SMALLER, ESSENTIALLY REMAINS
CONSTANT) as temperature increases; consequently resistivity becomes (LARGER, SMALLER,
ESSENTIALLY REMAINS CONSTANT). Circle your choices.
(d)
The RED end of the visible spectrum has a λ of about (400 nm, 5000 Å, 0.7 μm, 1.0 μm) and the BLUE end
of the visible spectrum has a λ of about (400 nm, 5000 Å, 0.7 μm, 1.0 μm).
(e) Compute the band gap in electron volts for StanBurnsium, a very important and rare semiconductor material
(named after a great guy) that could be used for emission in the middle (green/yellow) of the visible spectrum.
Note the color choice for a Green Bay Packers fan. Good game on Monday night football!
(f) (GaAs, Si, C, Ge, InP, GaN) are used for photonic applications because the energy bands yield
(Indirect, Direct, Oblique, Tangential) photon transitions. Circle all that apply.
(g) The majority charge carriers in phosphorus or arsenic doped Si are (Electrons, Holes, Neutrons, Ions) and
consequently the minority charge carriers are (Electrons, Holes, Neutrons, Ions). Circle your choices.
(h) The majority charge carriers in boron or gallium doped Si are (Electrons, Holes, Neutrons, Ions) and
consequently the minority charge carriers are (Electrons, Holes, Neutrons, Ions). Circle your choices.
(i)
Rank in order from (1) lowest resistivity(ρ) to (6) highest resistivity(ρ) of the following
Cu_____ Au_____ Al_____
Ag_____ Intrinsic Si_____
Deionized H2O)_____
Problem 2 (46 Points) Analyze a Cylindrical Resistor With Length L= 100 μm and Diameter D = 3 μm
A
D = 3 μm
B
L= 100 μm
The Si resistor is doped with ND=
3 x 1016 cm-3.
PROPERTY
List Two Possible Dopant Elements
Majority Carrier Type and Numerical Density
Minority Carrier Type and Numerical Density
Mobility of the Majority Carriers
Resistance between Terminals A and B
ANSWER