| CPC H10F 39/8037 (2025.01) [H10F 39/802 (2025.01)] | 19 Claims |
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1. An image sensing device comprising:
a substrate having a first surface on which light is incident and a second surface facing the first surface;
a plurality of detection structures, each comprising a control node configured to exhibit a conductivity type and generate a potential gradient in the substrate, and a detection node configured to capture photocharge which is generated in response to incident light and migrates in response to the potential gradient;
a first well area disposed to abut the control nodes of the plurality of detection structures and containing an impurity with a different conductivity type from the conductivity type of the control nodes; and
a second well area spaced apart from the control node by a predetermined distance and overlapping with the control node, the second well area including an impurity with a same conductivity type as the conductivity type of the control nodes,
wherein the first well area comprises a well opening extended toward the first surface between the second well areas adjacent to each other.
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