formation of depletion region

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Write a short note on formation of depletion region. 

A PN junction is formed using a positive and negative semiconductor.  When the two semiconductor are joined together , the electron from the n-side are diffused to the n- reason and they form a layer of negative charges from the pyside are diffuse to the end the season and they form a layer of positive charge on the n - side . The reason between those two layer is the depletion region of the semiconductor. 

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