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Unformatted text preview: ee blue + and - in the above diagram: Near the p-n junction, the high
concentration of electrons in the n-type material causes some
electrons to diffuse into the p-type material. Likewise, the high
concentration of holes in the p-type material causes some holes to
diffuse into the n-type material. Note: this process is stopped by the bound charge (whether holes or
electrons), left behind. Diffusing electrons leave behind in the n-type
material an uncovered (unpaired with an electron) positive charge
bound in the nucleus of the donor atom. Likewise for the holes. ECE 207 - 23 Nov 10 Page 4 of 6 - Nov 23, 2010 this bound charge induces an electric ﬁeld, E,
in the depletion region. This electric ﬁeld
establishes an energy barrier that impedes
charge ﬂow Figure 10.2 Three different modes of
operation for the diode (see
ﬁgure 10.2) ECE 207 - 23 Nov 10 Page 5 of 6 - Nov 23, 2010 Ideal diode behavior ( section 10.4) Example 10.5 Analysis: Possibilities: both diodes conducting, one conducting and one
nonconducting, both nonconducting Lets assume diode 1 is on (is conducting), say it is at a
potential of 8, so it looks like diode 2 has 3 V on the right and 8
on the left, so it is off ECE 207 - 23 Nov 10 Page 6 of 6 - Nov 23, 2010 Is the diode conducting?...
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This note was uploaded on 01/25/2014 for the course ECE 207 taught by Professor Szilagyi during the Spring '07 term at Arizona.
- Spring '07
- Electrical Engineering