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What are n-type and p-type semiconducts ?How is a semiconductorjunction formed ? |
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Answer» Solution :n-type semiconductor `:` When a pure semiconductor is doped with pentavalent atomslike Arsenic, Antimony , Bismuth, then n-type semiconductor is formed. p-type semiconductor `:` When a pure semiconductor is doped with trivalent AOMS like Indium, Gallium, Al, p-type semiconductor is formed. Formation of p-n junction diode `:` When p-typeand n-type semiconductors are formed side by side, at the junction ,holes from p side diffuse to the n-side and ELECTRONS from n-side to p-side. Hence positive CHARGEIS established at the p-side. At the junction, the electrons and holes recombine and the REGION is FREE from charge carriers. This region which is free from charge carriers is called depletion layer. The potential developed near the p-n junction is called barrier potential. The potential barrier stops further diffusion of holes and electron across the junction. 
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