Patent ID: 9048355
Filing Date: 2015-06-02
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device, comprising the steps of: providing a semiconductor substrate with a front-side main surface and an opposed main surface, which is opposed to the front-side main surface, said semiconductor substrate having an insulating layer embedded therein between the front-side main surface and the opposed main surface and a semiconductor layer between the front-side main surface and the insulating layer; forming a trench extending from the front-side main surface to a back-side of the semiconductor layer, the back-side of the semiconductor layer facing the insulating layer; forming a mark within the trench, said mark having a deeply located surface recessed with respect to the back-side of the semiconductor layer, said mark comprising at least a film of material that is the same as a material of said semiconductor layer; forming in the semiconductor layer a plurality of light receiving elements at the front-side main surface; removing a region of the semiconductor substrate that is between the opposed main surface and the back-side of the semiconductor layer; and disposing a light receiving lens for supplying light to one of the light receiving elements using the mark for alignment.