Patent ID: 6030852
Filing Date: 2000-02-29
Classification: H01L

Abstract:
A method of manufacturing a solid-state imaging device, the solid-state imaging device comprising a semiconductor substrate, a photodiode part arranged on the semiconductor substrate for receiving incident light to generate a charge, a lower microlens, a flattening film and an upper microlens, wherein the lower microlens, the flattening film, and the upper microlens correspond to the photodiode part and are formed in this order above the photodiode part, the method comprising the steps of:a) forming a first film on the photodiode part, the first film having a concave surface opposite to the surface facing the semiconductor substrate;b) forming a lower microlens having a higher refractive index than the first film by coating, heating, softening and hardening a first resin material on the fist film, a surface shape of the lower microlens facing the semiconductor substrate being determined by a surface shape of the first film, the lower microlens having a convex shape of increased thickness at a central part, the central part of the convex shape extending in a direction toward the substrate;c) forming a flattening film having a lower refractive index that the lower microlens by coating and flattening a second resin material on the lower microlens; andd) forming an upper microlens having substantially the same photopermeability as the lower microlens and substantially the same refractive index as the lower microlens by coating, heating, softening and hardening a third resin material on the flattening film.