Prob.
6.31
Prob.
6.32
Part. C:
Under high injection conditions, electric field increases from left to
right in the sub-collector region (as shown in previous part).
Breakdown field in material A is less than that in material B. To
obtain a higher breakdow
(b) Band-bending as a function of acceptor density (X-axis units Log10[Na])
(c) Band-bending as a function of acceptor/donor density (X-axis units Log10[Na])
(d) Band-bending as a function of acceptor/donor density (X-axis units Log10[Na])
ECE 221A Winter 2011
Homework 1
Due: Tuesday, January 25, 2011
1. Prob. 2.8 from the text book (included below).
2. Prob. 2.9 from the text book (included below).
3. In the class it was stated that the maximum recombination occurs
when the denominator in
ECE 221A Winter 2011
Homework 4
Due: Friday, March 4, 2011
Prob. 6.31 from the text book.
Prob. 6.32 from the text book.
The following problem from Streetman and Banerjee.
Prob. 4.19 Plots
Variation of Pn(x=0) with mobility
Pn(x=0) Vs. Vbias for = 0.1, 1, 1000 cm2/Vs
1000
1
0.1
Quasi Fermi Levels for P = 0.1, 1000 cm2/Vs
EC
Ei
EV
P = 1000
P = 0.1
Distance in cm
Current Density Vs Mobility [Log-Log Plot]
1E-6
Jp [A/cm -2]
1E
ECE 221A Winter 2014
Instructor: Prof. Umesh Mishra
Due on 3/3/2014
HW#4
Prob 1) Consider a Schottky barrier between an n-type region and a metal. In the class, the
derivation of forward bias current involved an integration over electron k-states (at the
ECE 221A, Winter 2014, HW2 Solutions
Contact : [email protected]
February 12, 2014
1
Problem 1
The zero bias capacitance across a structure is measured by grounding one side and applying
a small AC signal on the other side. This AC signal causes the
Prob. 4.19 Plots
Variation of Pn(x=0) with mobility
Pn(x=0) Vs. Vbias for = 0.1, 1, 1000 cm2/Vs
1000
1
0.1
Quasi Fermi Levels for P = 0.1, 1000 cm2/Vs
EC
Ei
EV
P = 1000
P = 0.1
Distance in cm
Current Density Vs Mobility [Log-Log Plot]
1E-6
Jp [A/cm -2]
1E
ECE 221A, Winter 2014, HW4 Solutions
Contact : [email protected]
March 15, 2014
1
Problem 1
Figure 1: Band diagram
The approach followed here will be very similar to prob2 in HW2. We assume that the
current in the depletion region is just drift-diusi
(b) Band-bending as a function of acceptor density (X-axis units Log10[Na])
(c) Band-bending as a function of acceptor/donor density (X-axis units Log10[Na])
(d) Band-bending as a function of acceptor/donor density (X-axis units Log10[Na])
0.16 eV
0.16 eV
ECE 221A, Winter 2014, HW4 Solutions
Contact : [email protected]
March 15, 2014
1
Problem 1
Figure 1: Band diagram
The approach followed here will be very similar to prob2 in HW2. We assume that the
current in the depletion region is just drift-diusi
ECE 221A Winter 2015
Instructor: Prof. Umesh Mishra
Due on 1/22/2015 in class
HW#1
While drawing any band diagram, clearly indicate the charge profile and electric fields first. In
the band diagram, draw conduction band, valence band, vacuum level, and Fe
ECE 221A Winter 2015
Instructor: Prof. Umesh Mishra
Due on 3/12/2015 in class
HW#5
While drawing any band diagram, clearly indicate the charge profile and electric fields first. In
the band diagram, draw conduction band, valence band, vacuum level, and Fe
ECE 221A Winter 2015
Instructor: Prof. Umesh Mishra
Due on 02/03/2015
HW#2
While drawing any band diagram, clearly indicate the charge profile and electric fields first. In
the band diagram, draw conduction band, valence band, vacuum level, and Fermi leve
ECE 221A Winter 2015
Instructor: Prof. Umesh Mishra
Due on 3/3/2015
HW#4
While drawing any band diagram, clearly indicate the charge profile and electric fields first. In
the band diagram, draw conduction band, valence band, vacuum level, and Fermi level
ECE 221A Winter 2015
Instructor: Prof. Umesh Mishra
HW#3
While drawing any band diagram, clearly indicate the charge profile and electric fields first. In
the band diagram, draw conduction band, valence band, vacuum level, and Fermi level clearly.
Prob 1)
ECE 221A, Winter 2014, HW3 Solutions
Contact : [email protected]
March 5, 2014
1
Problem 1
1
2
Problem 2
7
Here is a small derivation to show how we can nd out the discontinuity in charge prole
at the heterojunction. We start by assuming that there i