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(a) state briefly the processes involved in the formation ofp-nhow the depletion region is formed (b) using the necessary ciruitdiagrams showp-n jucntion are obtained in (i) forward biasing (ii) reverse biasing how these characteiistics are made use of in recitifcation |
Answer» SOLUTION : Two PROCESSES occur during the formation of a p-n junction are diffusion and drift. Due to the concentration gradient across p and n-sides of the junction, holes diffuse from p-side to n-side (p `to` n) and electrons diffuse from n-side to p-side (n `to` p). This movement of CHARGE carriers leaves behind ionised acceptors (negative charge `phi` - immobile) on the p-side and donors (positive charge immobile) on the n-side of the junction. This SPACE charge region on EITHER side of the junction together is known as depletion region. |
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