What Causes the Setting up of High Electric Field Even for Small Reverse Bias Voltage Across the Diode? - Physics

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What causes the setting up of high electric field even for small reverse bias voltage across the diode?

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Because of heavy doping, a very thin (<10−6 m) depletion region is formed between the p and n sides, and hence, the electric field of the junction is extremely high (~5 × 106 V/m) even for a small reverse bias voltage of about 5V.

Concept: Semiconductor Diode
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