Patent ID: 8664031
Filing Date: 2014-03-04
Classification: H01L

Abstract:
1. A process for making a semiconductor device including a semiconductor photodiode region specifically configured for receiving light with a wavelength of 500 nm or less, the process comprising: providing a silicon substrate of a first conductivity type having therein a region of a second conductivity type with a light receiving area of a semiconductor photodiode at a light receiving surface of the substrate; forming an interlayer insulating layer on the light receiving surface of the silicon substrate with an opening over the light receiving area of the semiconductor photodiode; forming an antireflection film in the opening over the light receiving area, said antireflection film including a silicon oxide film and a silicon nitride film, said antireflection film being formed by first thermally oxidizing silicon on a surface of the silicon substrate in an atmosphere of oxygen gas or in an atmosphere of mixed gas of oxygen and hydrogen at a temperature of 800° C. or more in a state in which at least said surface of the silicon substrate serving as a light-receiving portion of the region is exposed and then depositing a silicon nitride film on said silicon oxide film, wherein,