Patent ID: 7875898
Filing Date: 2011-01-25
Classification: B23K,H01L

Abstract:
1. A semiconductor device manufactured by using irradiation with laser light to partition a substrate having semiconductor layers formed thereon, with gallium nitride contained in at least one of the substrate and the semiconductor layers, wherein grooves to be used as boundaries between individual substrates are formed by irradiating the substrate along partitioning locations with laser light, the substrate is partitioned into the individual substrates along the boundaries where the grooves are formed, whereby a slope made by the irradiation with laser light is left, the substrate is immersed into an acid solution before or after the foregoing partitioning so that deposits of gallium compounds that have sublimed due to the irradiation with laser light and adhered to the substrate or electrodes are removed, the individual substrates is sealed with a resin, the grooves extend to not less than 30% and not more than 60% of the thickness of the substrate, and are each formed into a quasi V-shape cross-section so that the slope made by the irradiation with laser light is an inclined slope that is inclined at 20° to 60° with respect to a normal to the substrate, wherein the semiconductor device is a light-emitting element, wherein the light-emitting element has an n-type semiconductor layer and a p-type semiconductor layer formed on top of the substrate, and wherein a Pt layer and, on top of it, a rhodium layer, are formed in the p-type semiconductor layer region in order to establish an ohmic contact with the p-type semiconductor layer, thereby producing a dual layer structure acting as a reflective film, with a p-type electrode composed of gold formed thereon.