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Current flowing in a certain PN junction at room temperature is 2 X 10-7A, when a large reverse bias voltage is applied. Calculate current when a forward voltage of 0.1 V is applied across junction.
Ans:
The diode current is given as I = I0 (eV/VT - 1)
From given data:
Large reverse bias current I≈IO= 0.2 µA
Applied Voltage V = 0.1 V
Volt-equivalent of temperature, VT= 26 mV or 0.026 V at room temperature
So, the current flowing through the diode, I = 0.2 X 10-6(e0.1/0/026 -1) = 29.38 µA
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