Generally we know,conventional current is responsible for the operation of current flow in forward biased PN diode.But,we do not know how this conventional current is been produced.Now,let us see..
Under forward bias ,+ve charges in p-type are repelled and -ve charges in n-type are repelled by the electric field.Hence it crosses the junction and creates a flow of current.
When
an external DC is applied,the electrons from the n-type and holes from
the p-type tries to cross the junction.In every recombination,one
electron vanishes and enters in to p-type.In p-type one covalent bond is
broken and it results with one free electron and one free hole.This
free electron is attracted by the positive terminal.This is called conventional current.This results in continuous and large current flow.Thus depletion region is reduced.
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| (Image: Current Flow in a Diode) |
NOTE:Conventional current flows in the direction opposite to that of the electron flow direction.
A clear and insightful explanation of conventional current in a PN junction diode. The discussion effectively connects electron and hole movement with the direction of conventional current, making this fundamental semiconductor concept easier to understand. The concise explanation and supporting illustrations are particularly helpful for students and beginners learning the basics of electronics.
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