Essential University Physics: Volume 2 (3rd Edition)
3rd Edition
ISBN: 9780321976420
Author: Richard Wolfson
Publisher: PEARSON
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Question
Chapter 37, Problem 26E
To determine
The shortest wavelength of light produced and the material which produces this light.
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Students have asked these similar questions
a)
for Ge, Si and GaAs. (Why is ni highest for Ge? Why is it lowest for GaAs?)
Explain qualitatively the differences in intrinsic carrier concentrations
b) Explain qualitatively why ni increases with increasing temperature.
1500
T(*C)
1019
1000 500
200 100
27
List of band gaps of semiconductor materials.
1018
Band g
@ 302
Group Material
Symbol
1017
IV
Diamond
5.5
Ge
IV
Silicon
Si
1.11
1016
IV
Germanium
Ge
0.67
IlI-V
Gallium(II) nitride
GaN
3.4
1015
III-V
Gallium(III) phosphide GaP
2.26
III-V
Gallium(III) arsenide
GaAs
1.43
Si
1014
IV-V
Silicon nitride
Si,N,
5.
IV-VI
Lead(II) sulfide
PbS
0.37
1013
IV-VI
Silicon dioxide
SiO2
Copper(1) oxide
2.1
MAIM
1012
1011
1010
GaAS
109
108
107
106
0.5 1.0 1.5 2.0 2.5 3.0
1000/T(K )
Intrinsic carrier density n; (cm3)
A ALAS semiconductor crystal has a lattice constant of a = 0.13 nm, the volume density of As
atoms in this crystal will be:
O 3.641e24 /cm^3
2.048e30 /cm^3
O 1.821e24 /cm^3
O 3.550e16 /cm^3
O 1.593e24 /cm^3
Figure 1 shows the absorption coefficient for several direct and indirect bandgap
semiconductors. Analyses these figure in term of indirect bandgap materials.
ABSORPTION COEFFICIENT (cm²)
106
105.
104
103.
10²
10
0.2
3
GaP
2
Si
0.6
PHOTON ENERGY (CV)
1.5
GaAs
InP
Figure 1
In0.53 Ga0.47As
1.4
WAVELENGTH (μm)
0.7
1.8
Chapter 37 Solutions
Essential University Physics: Volume 2 (3rd Edition)
Ch. 37.1 - Prob. 37.1GICh. 37.2 - If a scientist uses microwave technology to study...Ch. 37.3 - Prob. 37.3GICh. 37 - If you push two atoms together to form a molecule,...Ch. 37 - Prob. 2FTDCh. 37 - Prob. 3FTDCh. 37 - Does it make sense to distinguish individual NaCl...Ch. 37 - Prob. 5FTDCh. 37 - Prob. 6FTDCh. 37 - Radio astronomers have discovered many complex...
Ch. 37 - Prob. 8FTDCh. 37 - Prob. 9FTDCh. 37 - Prob. 10FTDCh. 37 - Prob. 11FTDCh. 37 - Prob. 12FTDCh. 37 - Prob. 13FTDCh. 37 - Prob. 14FTDCh. 37 - Prob. 15FTDCh. 37 - Prob. 16ECh. 37 - Prob. 17ECh. 37 - Prob. 18ECh. 37 - Prob. 19ECh. 37 - Prob. 20ECh. 37 - Prob. 21ECh. 37 - Prob. 22ECh. 37 - Prob. 23ECh. 37 - Prob. 24ECh. 37 - Prob. 25ECh. 37 - Prob. 26ECh. 37 - Prob. 27ECh. 37 - Prob. 28ECh. 37 - Prob. 29PCh. 37 - Prob. 30PCh. 37 - Prob. 31PCh. 37 - Prob. 32PCh. 37 - Prob. 33PCh. 37 - Prob. 34PCh. 37 - Prob. 35PCh. 37 - Prob. 36PCh. 37 - Prob. 37PCh. 37 - Prob. 38PCh. 37 - Prob. 39PCh. 37 - Prob. 40PCh. 37 - Prob. 41PCh. 37 - Prob. 42PCh. 37 - Prob. 43PCh. 37 - Prob. 44PCh. 37 - Prob. 45PCh. 37 - Prob. 46PCh. 37 - Prob. 47PCh. 37 - Prob. 48PCh. 37 - Prob. 49PCh. 37 - Prob. 50PCh. 37 - Prob. 51PCh. 37 - Prob. 52PCh. 37 - Prob. 53PCh. 37 - Prob. 54PCh. 37 - The critical field in a niobium-titanium...Ch. 37 - The transition from the ground state to the first...Ch. 37 - Prob. 57PCh. 37 - Prob. 58PCh. 37 - Youre troubled that Example 37.1 neglects the mass...Ch. 37 - Prob. 60PCh. 37 - The Madelung constant (Section 37.3) is...Ch. 37 - Prob. 62PCh. 37 - (a) Count the number of electron states N(E) with...Ch. 37 - Prob. 64PCh. 37 - Prob. 65PCh. 37 - Prob. 66PCh. 37 - Prob. 67PCh. 37 - Prob. 68PPCh. 37 - Prob. 69PPCh. 37 - Prob. 70PPCh. 37 - Prob. 71PP
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