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(e) Write the expression for the total current as a function of Va
of the diode. Label the critical
(f) Sketch the I-V
characteristics
parameters in the sketch.
N-type
Na
Va
+
Xn 0
Xp
P-type
Na

3. Consider the following parameters in a silicon pn junction at T =
300 K.
Nd 1 x 1016 cm-³
Dn = 25 cm²/s
™n = 2 μs
Na = 2 x 1016 cm-³
Dp = 10 cm²/s
Tp = 1 μs
ni = 1.5 x 1010 cm-3
Er = 11.7
Eo = 8.85 x 10-12 F/m

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