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MHT CET Medical202622 April 2026Evening ShiftPhysicsSemiconductorsActual

The depletion region of a p-n junction is formed due to

Options

  1. Adrift of majority carriers under the influence of an applied electric field.
  2. Bthermal energy exciting electrons from the p-side to the n-side.
  3. Cdiffusion of majority carriers across the junction immediately after formation, leaving behind fixed immobile
  4. Dthe physical removal of material at the junction interface during manufacturing

Correct answer

C. diffusion of majority carriers across the junction immediately after formation, leaving behind fixed immobile

Step-by-step solution

When a p-n junction is formed, there is a concentration gradient of charge carriers across the junction. Due to this gradient, majority carriers diffuse across the junction. Holes diffuse from the p-side to the n-side, and electrons diffuse from the n-side to the p-side. As these mobile charge carriers cross the junction, they leave behind uncompensated, fixed immobile ions (negative acceptor ions on the p-side and positive donor ions on the n-side). This region near the junction, which is depleted of mobile charge

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