Solid-state imaging device and manufacturing method for the same
View Patent ↗Photoelectric converters are arranged two-dimensionally in a semiconductor substrate. A planarizing layer, a light shielding film, a further planarizing layer and condenser lenses are formed sequentially on the semiconductor substrate and the photoelectric converters. The light shielding film has apertures at positions corresponding to the photoelectric conversion devices. Multilayer interference filters that transmit either a red, green or blue wavelength component of light are disposed in the apertures.
1. A manufacturing method for a solid-state imaging device, comprising:
a first step of forming a multilayer interference filter over a semiconductor substrate having photoelectric converters arranged two-dimensionally;
a second step of forming a groove by removing the multilayer interference filter except for portions opposing the photoelectric converters; and
a third step of forming a light shielding film in the groove, wherein the third step includes:
laminating a light shielding material on a remaining portion of the multilayer interference filter and the groove; and
removing the light shielding material laminated on the multilayer interference filter by oblique etching relative to a wafer surface.
2. The manufacturing method for a solid-state imaging device of claim 1 , wherein
the light shielding material is a metal.
3. A manufacturing method for a solid-state imaging device, comprising:
a first step of forming multilayer interference filters on a semiconductor substrate having photoelectric converters arranged two-dimensionally, the multilayer interference filters having different film thicknesses depending on a wavelength of light to be transmitted;
a second step of forming an insulation film on the multilayer interference filters, the insulation film having a film thickness greater than or equal to a difference in film thickness between the multilayer interference filters;
a third step of forming grooves by removing the insulation film and the multilayer interference filters except for portions opposing the photoelectric converters;
a fourth step of laminating a light shielding material on the insulation film and the semiconductor substrate; and
a fifth step of polishing the laminated light shielding material and the insulation film until a thickest portion of the multilayer interference filters is exposed.
4. The manufacturing method for a solid-state imaging device of claim 3 , wherein
the laminated light shielding material and the insulation film are polished using a chemical mechanical polishing method.
5. The manufacturing method for a solid-state imaging device of claim 4 , wherein
the light shielding material is one of tungsten and copper.