Abstract: A semiconductor device includes a semiconductor part; an electrode selectively provided on the semiconductor part, the electrode being electrically connected to the semiconductor part; and multiple metal layers provided on the electrode. A method of manufacturing the semiconductor device includes selectively forming a first metal layer on the electrode; forming a palladium layer on the first metal layer, the palladium layer covering the first metal layer; forming a second metal layer on the palladium layer, the second metal layer covering the palladium layer; and forming a gold layer directly on the palladium layer by replacing the second metal layer with the gold layer.

Abstract: A semiconductor device includes a semiconductor part; an electrode selectively provided on the semiconductor part, the electrode being electrically connected to the semiconductor part; and multiple metal layers provided on the electrode. A method of manufacturing the semiconductor device includes selectively forming a first metal layer on the electrode; forming a palladium layer on the first metal layer, the palladium layer covering the first metal layer; forming a second metal layer on the palladium layer, the second metal layer covering the palladium layer; and forming a gold layer directly on the palladium layer by replacing the second metal layer with the gold layer.

Abstract: According to one embodiment, a method for manufacturing an LED device includes forming a laminated semiconductor layer including a GaN layer of a first conductivity type, a GaN-based luminous layer, and a GaN layer of a second conductivity type stacked in this order on a surface of a substrate, forming a resist pattern on the laminated semiconductor layer, subjecting the laminated semiconductor layer to reactive ion etching using the resist pattern as a mask to selectively remove the laminated semiconductor layer to form an LED element structure part and an electrode connection region, removing the resist pattern, and treating the substrate including the LED element structure part and the electrode connection region with a first etching residue removing aqueous solution.

Abstract: According to one embodiment, a method for manufacturing an LED device includes forming a laminated semiconductor layer including a GaN layer of a first conductivity type, a GaN-based luminous layer, and a GaN layer of a second conductivity type stacked in this order on a surface of a substrate, forming a resist pattern on the laminated semiconductor layer, subjecting the laminated semiconductor layer to reactive ion etching using the resist pattern as a mask to selectively remove the laminated semiconductor layer to form an LED element structure part and an electrode connection region, removing the resist pattern, and treating the substrate including the LED element structure part and the electrode connection region with a first etching residue removing aqueous solution.