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Asked in CBSE AIPMT 1998 · Biasing and I-V characteristics
Idea: conducting one way and not the other means the device is not symmetric, so it cannot be a uniform piece of material.
A p-n junction has a built-in barrier that an applied voltage can either oppose or reinforce.
Forward bias lowers the barrier and lets current flow freely.
Reverse bias raises it, leaving only the tiny minority-carrier current, which is close enough to zero to be called none.
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