The diffusion potential across a p-n junction __________.

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SSC JE EE Previous Year Paper 16 (Held On: 3 March 2017 Morning)
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  1. decreases with increasing doping concentration
  2. increases with decreasing band gap
  3. does not depend on doping concentrations
  4. increases with increase in doping concentrations

Answer (Detailed Solution Below)

Option 4 : increases with increase in doping concentrations
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In a pn junction, if the doping concentration increases, the recombination of electrons and holes increases, thereby increases the voltage across the barrier.

\(V = \frac{{KT}}{q}{\rm{ln}}\left( {\frac{{{N_a}{N_d}}}{{n_i^2}}} \right)\)

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