What causes the setting up of high electric field even for small reverse bias voltage across the diode ( - Physics - Semiconductor Electronics Materials Devices And Simple Circuits

Question

What causes the setting up of high electric field even for small
reverse bias voltage across the diode ?( No links please )

Deepak Kumar · Accepted Answer

Dear Student ,

Because of heavy doping , a thin (<10-6m) deplition region is formed between the p and n sides, and hence , the electric field of the junction is extremely high a (~5×106 V/m) even for a small reverse bias voltage of about 5 V
 
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What causes the setting up of high electric field even for small reverse bias voltage across the diode ?( No links please )