Question

explain the I-V characteristic of
a forward biased diode.​

Answer 1

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Forward biased diode : There is forward current only after the barrier potential of the pn- junction is overcome. Then there is an exponential rise in the current beyond the knee region. The forward-bias voltage required to reach the region of upward swing is called the threshold voltage $\sf{V_T}$, or cut in voltage. The threshold voltage is about 0.3 V for a germanium diode and about 0.7 V for a silicon diode.