When a forward bias is applied to a p-n junction, it
When a forward bias voltage is applied, The N-region is attached to the negative terminal of the battery and the P-region is connected to the positive terminal of the battery. Negative-negative and positive-positive repulsion occur on both sides, so it opposes the junction barrier voltage, hence the barrier voltage is reduced/lowered. The diagram of a diode in forward bias is shown as below:
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