As dipoles build up,the region near the pn junction is void of all charges and is called the restoration layer.

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As dipoles build up, there is actually a depletion region near the pn junction, which is void of majority carriers (electrons and holes). This depletion region creates an electric field that opposes further diffusion of minority carriers across the junction. This region is not called the restoration layer.

As Dipoles Build Up,the Region near the Pn Junction Is