First slide

P-N junction diode

Question

In PN-junction diode the reverse saturation current is $10^{- 5}$ A at 27°C. The forward current for a voltage of 0.2 volt is

Moderate

A

$2037.6 \times 10^{- 3} A$
B

$203.76 \times 10^{- 3} A$
C

$20.376 \times 10^{- 3} A$
D

$2.0376 \times 10^{3} A$

Solution

The forward current
$i = i_{s} (e^{eV / KT} - 1) = 10^{- 5} [e^{\frac{1.6 \times 10^{- 19} \times 0.2}{1.4 \times 10^{- 23} \times 300}} - 1] = 10^{- 5} [2038.66 - 1] = 20.376 \times 10^{- 3} A$

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