Patent ID: 9568364
Date: 2017-02-14
CPC Classifications: G01J,H01L,Y02E,Y02P

Claim:
1. A signal processing method for performing a signal processing based on a signal output from a photodiode depending on photocharges generated in the photodiode by a light illumination, comprising: performing a signal processing using a photodiode based on a signal output from the photodiode, wherein the photodiode includes a semiconductor layer made of silicon and an insulator layer in contact with the semiconductor layer, wherein the semiconductor layer is provided with a first-conduction-type region and a second-conduction-type region located between the first-conduction-type region and an interface between the semiconductor layer and the insulator layer, the second-conduction-type region having a polarity opposite to the first-conduction-type region, and wherein a thickness of a non-depleted region of the second-conduction-type region is larger than roughness of the interface, and is smaller than a penetration depth of ultraviolet light at which an intensity of the ultraviolet light in a wavelength range of 200-320 nm entering the semiconductor layer is equal to 1/e times the intensity of the same ultraviolet light at an outermost surface of the semiconductor layer.