Patent ID: 9728577
Date: 2017-08-08
CPC Classifications: H01L,Y02E

Claim:
1. An infrared image sensor comprising: a bias circuit receiving a timing signal, the bias circuit generating a bias voltage having a first value and a second value in response to the timing signal; a semiconductor light-receiving device including a photodiode provided by a semiconductor mesa disposed on a first conductive type semiconductor substrate, the semiconductor light-receiving device receiving the bias voltage; a read-out circuit including a read-out electrode connected to the photodiode, the read-out electrode receiving an electrical signal from the photodiode; and a signal processing circuit processing a read-out signal from the read-out circuit synchronously with the timing signal, wherein the semiconductor mesa of the photodiode includes an optical absorption layer made of a III-V group compound semiconductor, a second conductive type spacer layer disposed on the optical absorption layer, and a second conductive type cap layer disposed on the spacer layer; and the optical absorption layer has a type II multi quantum well structure including first compound semiconductor layers containing antimony as a constituent element and second compound semiconductor layers that are stacked alternately.