Manufacturing method of solid-state imaging device, solid-state imaging device, and camera
A manufacturing method of a solid-state imaging device prevents generation of a space due to insufficient filling of a conductive material. Materials constituting a multilayer film 41 are sequentially deposited on a semiconductor substrate, and portions respectively included in a plug formation intended region and a surrounding region that surrounds the plug formation intended region are removed from the deposited multilayer film 41 . Next, the plug formation intended region and the surrounding region from which the portions have been removed is refilled with a single insulating material, and a hole is formed on the plug formation intended region by etching. Then, the formed hole is filled with a conductive material to therefore form a plug.
1 . A manufacturing method of a solid-state imaging device including a multilayer film and a plug that penetrates the multilayer film, the manufacturing method comprising:
a multilayer film forming step of forming a multilayer film;
a removing step of removing, from the formed multilayer film, portions respectively included in a plug formation intended region in which a plug is to be formed and a surrounding region that surrounds the plug formation intended region;
a refilling step of refilling, with a single insulating material, the plug formation intended region and the surrounding region from which the portions have been removed;
a hole forming step of forming a hole in the refilled plug formation intended region by etching; and
a plug forming step of forming the plug by filling the formed hole with a conductive material.
2 . The manufacturing method of claim 1 , wherein
the multilayer film covers a semiconductor substrate including a pixel region in which pixels are arranged, and a peripheral region in which circuits are arranged and that is on a periphery of the pixel region, and
the peripheral region is covered by the portions of the multilayer film.
3 . The manufacturing method of claim 1 , wherein
the removing step is performed such that the surrounding region has a width of at least 0.1 μm in a direction extending the plug formation intended region.
4 . The manufacturing method of claim 1 , wherein
the multilayer film has a depression between pixels due to a difference in thickness of the multilayer film for each pixel, and
the refilling step further fills the depression with the single insulating material.
5 . The manufacturing method of claim 4 , wherein
the refilling step comprises:
a depositing substep of depositing the single insulating material on the multilayer film so as to at least flatten the depression and the plug formation intended region and the surrounding region from which the portions have been removed; and
a polishing substep of polishing the deposited insulating material so as to expose a highest main face of the multilayer film.
6 . A solid-state imaging device comprising:
a multilayer film; and
a plug that penetrates the multilayer film, wherein
a region included in the multilayer film that surrounds the plug is composed of a single insulating material.
7 . The solid-state imaging device of claim 6 , wherein
the multilayer film covers a semiconductor substrate including a pixel region in which pixels are arranged, and a peripheral region in which circuits are arranged and that is on a periphery of the pixel region, and
a region included in the multilayer film that covers the peripheral region and excludes the plug is the region that surrounds the plug.
8 . A camera including the solid-state imaging device of claim 6.