Question
Give brief explanation of a semi-conductor diode.
✓
Answer
→A semiconductor diode is basically a $p-n$ junction with metallic contacts provided at the ends for the application of an external voltage. It is a two terminal device. A $p-n$ junction diode is symbolically represented as shown in fig. (b).
→The direction of arrow indicates the conventional direction of current (When the diode is under forward bias.) The equilibrium barrier potential can be altered by an external voltage V across the diode.
→The situation of $p-n$ junction diode under equilibrium (without bias) is shown in fig. (a) and (b).
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