SEMICONDUCTOR DEVICE CAPABLE OF PLANNING DIMINUTION, COMPOSED OF MAIN SURFACE, FUSE FORMING REGION, AND BLOCKING LAYER HAVING RECESSED PARTS

摘要

PURPOSE: A semiconductor device is provided to reduce a reflection ray directed from a reflective surface to a region located apart from a fuse forming region in a horizontal direction by forming the reflective surface having recessed parts. CONSTITUTION: A semiconductor substrate(2) includes a main surface, a fuse forming region, and a blocking layer(12a). The fuse forming region is formed on the main surface and includes a plurality of fuses(16a) buried therein. The blocking layer is formed between the fuse forming region and the semiconductor substrate. The blocking layer prevents a laser ray from proceeding to a lower portion by reflecting the laser ray which was illuminated when the fuse is cut. The blocking layer includes a reflective surface which has a shape of recessed parts in order to reflect the laser ray. The blocking layer is overlapped with a substantially whole region of the fuse forming region in a planar view.