EEE 537
Semiconductor Optoelectronics
Cun-Zheng Ning, Professor
School of Electrical, Computer and Energy
Engineering (ECEE)
Arizona State University
State University
Office: GWC 614
Tel: 480-965-7421
Band Structure Engineering by Heterostructuring:
Quantum Wells
aGaAs = 5.65 A
a AlAs = 5.66 A
Mismatch parameter < 0.2%
AlAs / GaAs / AlAs
Could be more general:
Al x Ga1 x As / Al y Ga1 y As / Al xGa
Electronic States of Semiconductors
Vacuum level
e
Eg
Ek
k
Valence band: Top most, fully filled band at T=0
Conduction band: Bottom most empty band at T=0
Affinity: from vacuum level to the bottom
Brief Review of Quantum Mechanics
Wave-particle duality
Schroedinger equation for free particles, in a periodic lattice
equation for free particles in periodic lattice
Effective masses
Bandstructure e
Waveguide Theory Based on Wave Optics
Waveguides were discussed in terms of geometric optics
or ray optics (Snell law total reflection etc)
or ray optics (Snells law, total reflection etc)
Geometric
Chapter 3 Light Propagation in Waveguides
From infinitely large space to finite, restricted geometry;
fi
Guide (restrict) wave in one or two directions, while propagating
in the rest of direction (s
Wave Propagation Across
Wave Propagation Across
Interfaces
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EEE537 2010 Fall C.Z. Ning ECEE ASU
Boundary Conditions
r
D1
n
medium 1
r
D2
medium 2
S
h 0
r
r
S D dS = V dV
rr
B dS = 0
S
rr
n ( D1 D2 )
Chapter 2: Light Propagation in Media
What is light has been evolving, in general EM wave propagation
Entire EM spectrum is described by the Maxwell equations
Semiconductors have been used to gener
Defects
Anything that breaks the original symmetry
Unavoidable
Affect electrical and optical properties (how?)
(h
Point defects involve isolated atoms in localized
defects
isolated atoms in localiz
Chapter 1: Materials for Optoelectronics
Anything
else ?
c2
Order in all ranges
Flow like a liquid
But with
orientational order
c1
SRO, and LRO in a
LRO
domain
No center
No center-of-mass order
order
El
Electrons and Holes in
Semiconductors
Semiconductors
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EEE537_Fall 2010 C.Z. Ning EECE ASU
Carrier Distributions: Fermi-Dirac Distribution
F-D Distribution: (Fermi and Dirac 1926, Jordan 1925):
Pro