Planar mount LED element and method for manufacturing the same

摘要

A planar mount LED element having at least a pair of P electrode and N electrode formed on one and the same surface of an LED substrate, and a method for manufacturing the same. A P type metal film(s) is formed at a predetermined portion on one surface of an N type LED substrate at a portion where a PN junction is to be formed on the surface of the N type LED substrate. An N type metal film is formed at a predetermined portion on the same surface of the N type LED substrate at a portion where an N electrode is to be formed on the surface of the N type LED substrate. Then the two films are covered with an insulation film to form a capped construction. Thereafter the portion where the PN junction is to be provided is subjected to heat treatment at the diffusing temperature, thereby forming the PN junction. The portion where the N electrode is to be provided is irradiated with a laser beam, thereby forming a heavily-doped P type alloy portion that reaches the N type LED substrate. Then the insulation film is removed, the P electrode is on the PN junction and the N electrode is formed on the heavily-doped N type alloy portion, thereby forming the P electrode and the N electrode on the same side of the LED substrate.