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Discuss the variation of current with vo...

Discuss the variation of current with voltage in a P-N Junction diode when it is forward biased.

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Variation of current with voltage when p-n junction diode is forward biased: Circuit diagram is shown below when p-n junction diode is forward biased. In the beginning, when applied forward bias is low (less than the potential barrier), forward current is very low because potential barrier voltage opposes the applied voltage. So a small forward current flows, till the applied voltage does not become greater than the potential barrier voltage. It is represented by the portion OP of the graph. As soon as the forward bias becomes greater than the potential barrier voltage, forward current increases linearly. It is represented by portion PQ of the graph. Voltage corresponding to point P in the graph is known as knee voltage.
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In a p-n junction diode, the current I can be expressed as I = I_0 (exp ((eV)/(2k_BT))-1) where I_0 is called the reverse saturation current, V is the voltage across the diode and is positive for forward bias and negative for reverse bias, and I is the current through the diode, k_B is th Boltzmann constant (8.6xx 10^ -5 eV/K) and T is the absolute temperature. If for a given diode I_0 = 5 xx 10^ -12 A and T = 300 K, then - What will be the forward current at a forward voltage of 0.6 V?

In a p-n junction diode, the current I can be expressed as I = I_0 exp ((eV)/(2k_BT)) where I_0 is called the reverse saturation current, V is the voltage across the diode and is positive for forward bias and negative for reverse bias, and I is the current through the diode, k_B is the Boltzmann constant (8.6xx 10^-5 (eV)/K) and T is the absolute temperature. If for a given diode I_0 = 5 xx 10^-12 A and T = 300 K, then - What will be the increase in the current if the voltage across the diode is increased from 0.6 V to 0.7 V?

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