Patent ID: 7785981

Claim:
A method of manufacturing a solid-state image pickup device comprising a structure including at least a first silicon layer in which a light-receiving sensor portion for effecting photoelectric-conversation is formed, an interconnection layer formed on a surface side of said first silicon layer and in which a lens is formed on a side opposite to said surface side of said first silicon layer, comprising: forming a groove on said first silicon layer around an image pickup region; forming a groove on said first silicon layer at a pad portion; burying a second silicon layer made of amorphous silicon or polycrystalline silicon into said groove formed around said image pickup region; burying a second silicon layer made of amorphous silicon or polycrystalline silicon into said groove formed at a pad portion; forming a light-receiving sensor portion on said first silicon layer after said second silicon layer is buried around at least said image pickup region; forming said interconnection layer on said surface side of said first silicon layer; forming a groove through said second silicon layer buried into said grove of said pad portion by forming a contact hole through said second silicon layer of said pad portion and into said interconnection layer such that said second silicon layer of said pad portion forms an insulating layer bordering said contact hole; connecting an electrode layer to said interconnection layer of said pad portion by burying a conductive material into said groove in said insulating layer; burying a metal layer on said insulating layer above said second silicon layer around said image pickup region; and forming said lens on the side opposite to said surface side of said first silicon layer by using said metal layer as an alignment mark.