Patent ID: 11929384
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. An image sensor, comprising:
a first photo-sensing device integrated in a semiconductor substrate, the first photo-sensing device being configured to sense light in a first wavelength spectrum; and
a second photo-sensing device integrated in the semiconductor substrate, the second photo-sensing device being configured to sense light in a second wavelength spectrum,
wherein the first photo-sensing device and the second photo-sensing device are spaced apart from each other in a surface direction extending parallel to a upper surface of the semiconductor substrate,
the first photo-sensing device and the second photo-sensing device each include
an upper surface that is proximate to the upper surface of the semiconductor substrate,
a lower surface facing the upper surface and distal from the upper surface of the semiconductor substrate, and
a doped region between the upper surface and the lower surface,

a wavelength selectivity of the second wavelength spectrum relative to the first wavelength spectrum of the second photo-sensing device varies depending on a depth of the upper surface of the second photo-sensing device from the upper surface of the semiconductor substrate in a thickness direction of the semiconductor substrate, the thickness direction being perpendicular to an upper surface of the semiconductor substrate, and
the depth of the upper surface of the second photo-sensing device from the upper surface of the semiconductor substrate in the thickness direction is a depth D2 that satisfies Relationship Equation 1,

EQE(λ2)≥3×EQE(λ1)  [Relationship Equation 1]

wherein, in Relationship Equation 1,
EQE (λ2) is external quantum efficiency at a wavelength (λ2) included in the second wavelength spectrum of the second photo-sensing device based on the depth of the upper surface of the second photo-sensing device in the semiconductor substrate being the depth D2, and
EQE (λ1) is external quantum efficiency at a wavelength (λ1) included in the first wavelength spectrum of the second photo-sensing device based on the depth of the upper surface of the second photo-sensing device in the semiconductor substrate being the depth D2.