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Explain the two processes involved in the information of a p-n junction diode. Hence, define the term'barrier potential'. |
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Answer» Solution :A small quantity of trivalent impurity (In) is fused to thin wafer of n type semiconductor (Ge or Si) just below the surface of contact. This p-type semiconductor along n type semiconductor wafer constitute a p-n junction. ALSO when a small quantity of PENTAVALENT impurity is dropped in a p-type semiconductor p-n junction is FORMED p-n junction can be formed when p-type semiconductor is heated in phosphorus gas to form diffused n type LAYER on the semiconductor. The potential difference due to negative immobile ions on p-side of the junction and positive immobile ions on the n-side of the junction is CALLED potential barrier. It prevents the movement of electrons from n region to p-region and movement of holes from p-region to n-region through the junction. |
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