January 2014
Intermediate to advanced
567 pages
23h 13m
English
Content preview from Principles of Analog Electronics
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Principles of Analog Electronics
268
8.3.3 Total Current
The total current density J in a semiconductor, which results from the motion of
charge carriers, can be the sum of four components depending on the type of
carriers, electrons, and/or holes, and the causes, drift or diffusion. Summarizing,
JJ J
np
=+
with
JJ JnqEqD
dn x
dx
nndriftn
diffusion
nn
()
=+ =µ+
JJ JpqEqD
dp x
dx
ppdriftp
diffusion
pp
()
=+ =µ−
8.3.4 Leakage Current
It is somewhat important to also dene the so called leakage current. In electron-
ics leakage current represents a parasitic and uncontrolled current, which ows
across regions of a material, not specically a semiconductor, where no
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