Definitions for "P-n junction"
A junction between an n-type and a p-type semiconductor
A p-n junction is a region in a semiconductor where the doping profile changes rapidly from "p-type" to "n-type". This results in a region void of free carriers and a built-in electric field.
the junction between a p-type semiconductor and an n-type semiconductor; "a p-n junction has marked rectifying characteristics"