Patent ID: 8405218
Filing Date: 2013-03-26
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; an electrode layer located on a surface of the semiconductor substrate; and a resin insulation layer located on the surface of the semiconductor substrate to partially cover the electrode layer, wherein the resin insulation layer and the electrode layer define a tapered hole having an opening defined by the resin insulation layer, a bottom defined by a first portion of the electrode layer, and a side wall connecting the opening to the bottom, the electrode layer has a first thickness at the first portion and a second thickness at a second portion covered with the resin insulation layer, the first thickness is less than the second thickness, a step portion between the first portion and the second portion of the electrode layer and a side portion of the resin insulation layer define the side wall of the tapered hole, an angle formed between the step portion of the electrode layer and the bottom of the tapered hole is equal to an angle formed between the side portion of the resin insulation layer and the bottom of the tapered hole, a lower end of the side portion of the resin insulation layer is continuously joined to an upper end of the step portion of the electrode layer to form a continuous surface, and as seen in profile from a top-to-bottom cross section, the opening of the tapered hole has a round shape with a radius of curvature equal to or greater than 1 micrometer, further comprising a plurality of tapered holes including the tapered hole, wherein a first angle is formed between the side wall and the bottom of a first one of the plurality of tapered holes, a second angle is formed between the side wall and the bottom of a second one of the plurality of tapered holes, and the first angle is different than the second angle.