Physics for Electronics Engineering: Unit III: Semiconductors and Transport Physics
Important Problems in Semiconductors and Transport Physics
Physics for Electronics Engineering
Anna university important problems
ANNA UNIVERSITY SOLVED PROBLEMS
Carrier concentration in an intrinsic semiconductor
Given
data
Solution
Electrical
conductivity of an intrinsic semiconductor
Extrinsic semiconductor
Given
data
Solution
(a) Concentration in n-type silicon
(b) Concentration in p-type silicon
Problem 3.3
A
silicon material is uniformly doped with phosphorus atoms at a concentration of
2 x 1019 m-3. The mobilitieS of holes and electrons are
0.05 and 0.12 m2 V-1 s-1 respectively, ni
= 1.5 x 1016 m-3 Find the electron and hole
concentrations and electrical conductivity. (A.U.
June 2014)
Solution
Solution
In
a p-type semiconductor, the hole concentration is equal to the acceptor
density.
Hall effect
Given
data
Solution
We
know that density of charge carriers
Substituting
the given values, we have
Given data
Solution:
Hall coefficient
Electron mobility
Problem
3.7
A
copper strip 2.0 cm wide and 1.0 mm thick is placed in a magnetic field with B
= 1.5 weber/m2 perpendicular to the strip. Suppose a current of 200
A is set up in the strip. What Hall potential difference would appear across
the strip?
Given
N = 8.4 x 1028 electrons /m3. (A.U. May 2015)
Given data
Solution
Note:
This problem is important in the sense that it shows that Hall voltage can be
also observed in metals besides semiconductor.
In
semiconductors, Hall voltage is comparatively much larger; it is of the order
of milli-volts as compared to the order of micro-volts in metals.
Moreover,
to observe Hall voltage in metals, current of the order of amperes is needed
when compared to the order of milliamperes as in the case of semiconductors.
Physics for Electronics Engineering: Unit III: Semiconductors and Transport Physics : Tag: : Physics for Electronics Engineering - Important Problems in Semiconductors and Transport Physics
Physics for Electronics Engineering: Unit III: Semiconductors and Transport Physics
Under Subject
Physics for Electronics Engineering
PH3254 - Physics II - 2nd Semester - ECE Department - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Related Subjects
Professional English II
HS3251 2nd Semester 2021 Regulation | 2nd Semester Common to all Dept 2021 Regulation
Statistics and Numerical Methods
MA3251 2nd Semester 2021 Regulation M2 Engineering Mathematics 2 | 2nd Semester Common to all Dept 2021 Regulation
Engineering Graphics
GE3251 eg 2nd semester | 2021 Regulation | 2nd Semester Common to all Dept 2021 Regulation
Physics for Electrical Engineering
PH3202 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation
Basic Civil and Mechanical Engineering
BE3255 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation
Electric Circuit Analysis
EE3251 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation
Physics for Electronics Engineering
PH3254 - Physics II - 2nd Semester - ECE Department - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Electrical and Instrumentation Engineering
BE3254 - 2nd Semester - ECE Dept - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Circuit Analysis
EC3251 - 2nd Semester - ECE Dept - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Materials Science
PH3251 2nd semester Mechanical Dept | 2021 Regulation | 2nd Semester Mechanical Dept 2021 Regulation
Basic Electrical and Electronics Engineering
BE3251 2nd semester Mechanical Dept | 2021 Regulation | 2nd Semester Mechanical Dept 2021 Regulation
Physics for Civil Engineering
PH3201 2021 Regulation | 2nd Semester Civil Dept 2021 Regulation
Basic Electrical, Electronics and Instrumentation Engineering
BE3252 2021 Regulation | 2nd Semester Civil Dept 2021 Regulation
Physics for Information Science
PH3256 2nd Semester CSE Dept | 2021 Regulation | 2nd Semester CSE Dept 2021 Regulation
Basic Electrical and Electronics Engineering
BE3251 2nd Semester CSE Dept 2021 | Regulation | 2nd Semester CSE Dept 2021 Regulation
Programming in C
CS3251 2nd Semester CSE Dept 2021 | Regulation | 2nd Semester CSE Dept 2021 Regulation