Patent ID: 7335916
Filing Date: 2008-02-26
Classification: H01L

Abstract:
1. A semiconductor light emitting device comprising: a transparent substrate; an electron injection layer which is formed on the transparent substrate and formed of N-type GaN-based semiconductor; an active layer which is formed on a first region of the electron injection layer; a hole injection layer which is formed on the active layer and formed of P-type GaN-based semiconductor; a first electrode structure which is formed on the hole injection layer and concurrently providing a high reflectivity and a low contact resistance; a second electrode structure which is formed on a second region of the electron injection layer; and a circuit substrate which is electrically connected with the first and second electrode structures, wherein the first electrode structure comprises a contact metal structure which is mesh- or island-shaped on the hole injection layer to expose a surface portion of the hole injection layer, and a reflective layer which covers the contact metal structure and the exposed surface portion of the hole injection layer, at least an upper portion of the reflective layer being made of silver (Ag) or aluminum (Al), an area ratio of the contact metal structure to the first electrode structure satisfies a following inequality: where A pd is the surface area of the contact metal structure contacting the hole injection layer, and A total is the entire area of the first electrode structure contacting the hole injection layer, and the first and second electrode structures are flip-chip bonded to the circuit substrate to extract light through the transparent substrate.