Patent ID: 9496298
Filing Date: 2016-11-15
CPC Classification: H01L,H04N

Claim Text:
1. A photodiode array module comprising: a first semiconductor substrate formed with a plurality of amplifiers, made of a first semiconductor material; and a second semiconductor substrate adhered to the first semiconductor substrate, made of a second semiconductor material different from the first semiconductor material, wherein the first semiconductor substrate has a first photodiode array, the second semiconductor substrate has a second photodiode array at a side of a surface opposed to the first semiconductor substrate, a first group of a plurality of the amplifiers provided on the first semiconductor substrate via a first wiring group, each amplifier of the first group of plurality of amplifiers being individually electrically connected to a respective photodiode of the first photodiode array, a second group of a plurality of the amplifiers provided on the first semiconductor substrate via a second wiring group and bumps respectively provided on the second wiring group, each amplifier of the second group of plurality of amplifiers being individually electrically connected to a respective photodiode of the second photodiode array, in the second semiconductor substrate, an end portion close to the first photodiode array side has a stepped portion, the stepped portion has: a first side surface and a second side surface along a thickness direction of the second semiconductor substrate; and a terrace surface located at a boundary between the first side surface and the second side surface and opposed to the first semiconductor substrate, each of the photodiodes composing the second photodiode array includes: a semiconductor region of a first conductivity type; and a pixel region of a second conductivity type located at a surface layer side of a surface of the second semiconductor substrate opposed to the first semiconductor substrate, a depth of the terrace surface from an opposing surface of the second semiconductor substrate to the first semiconductor substrate is deeper than a depth of the pixel region of the second photodiode array, the first side surface is closer to the first semiconductor substrate than the second side surface, and a crystal defect density in the first side surface is lower than a crystal defect density in the second side surface.