Consider the scenario depicted in Fig. 2.11 again. Suppose the electron concentration is equal to N at x = 0 and falls linearly to zero at x = L (Fig. 2.13). Determine the diffusion current. Injection We have N 0 Figure 2.13 Current resulting from a linear diffusion profile. dn Jn =qDn dx N L X (2.45) =-qDn (2.46) The current is constant along the x-axis; i.e., all of the electrons entering the material at x = 0 successfully reach the point at x = L. While obvious, this observation prepares us for the next example.
Consider the scenario depicted in Fig. 2.11 again. Suppose the electron concentration is equal to N at x = 0 and falls linearly to zero at x = L (Fig. 2.13). Determine the diffusion current. Injection We have N 0 Figure 2.13 Current resulting from a linear diffusion profile. dn Jn =qDn dx N L X (2.45) =-qDn (2.46) The current is constant along the x-axis; i.e., all of the electrons entering the material at x = 0 successfully reach the point at x = L. While obvious, this observation prepares us for the next example.
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:Consider the scenario depicted in Fig. 2.11 again. Suppose the electron concentration is
equal to N at x = 0 and falls linearly to zero at x = L (Fig. 2.13). Determine the diffusion
current.
Injection
We have
N
0
Figure 2.13 Current resulting from a linear diffusion profile.
In
=
dn
'n dx
qDn
N
L
X
(2.45)
=-qDn
(2.46)
The current is constant along the x-axis; i.e., all of the electrons entering the material at
x = 0 successfully reach the point at x = L. While obvious, this observation prepares us
for the next example.
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