BACKSIDE ILLUMINATED IMAGE SENSOR DEVICE STRUCTURE
First Claim
1. A backside illuminated image sensor device structure, comprising:
- a first substrate having a top surface and a bottom surface;
a plurality of pixel regions formed at the top surface of the first substrate;
a grid structure through the first substrate and between two adjacent pixel regions of the plurality of pixel regions, wherein the grid structure extends continuously through the first substrate in a vertical direction and has a front surface and a bottom surface, the front surface of the grid structure protrudes above the bottom surface of the first substrate, and the bottom surface of the grid structure is leveled with the top surface of the first substrate;
a doped liner surrounding a portion of the grid structure; and
a passivation layer formed on another portion of the grid structure, wherein the passivation layer is directly over the doped liner.
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Abstract
A method for forming a backside illuminated (BSI) image sensor device structure is provided. The BSI image sensor includes a first substrate having a top surface and a bottom surface, and a plurality of pixel regions formed at the top surface of the first substrate. The BSI image sensor also includes a grid structure through the first substrate and between two adjacent pixel regions. The grid structure extends continuously through the first substrate in a vertical direction and has a top surface and a bottom surface, the top surface of the grid structure protrudes above the bottom surface of the first substrate, and the bottom surface is leveled with the top surface of the first substrate.
21 Citations
21 Claims
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1. A backside illuminated image sensor device structure, comprising:
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a first substrate having a top surface and a bottom surface; a plurality of pixel regions formed at the top surface of the first substrate; a grid structure through the first substrate and between two adjacent pixel regions of the plurality of pixel regions, wherein the grid structure extends continuously through the first substrate in a vertical direction and has a front surface and a bottom surface, the front surface of the grid structure protrudes above the bottom surface of the first substrate, and the bottom surface of the grid structure is leveled with the top surface of the first substrate; a doped liner surrounding a portion of the grid structure; and a passivation layer formed on another portion of the grid structure, wherein the passivation layer is directly over the doped liner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A backside illuminated image sensor device structure, comprising:
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a first wafer having a top surface and a bottom surface; a transistor device formed on the top surface of the first wafer; an isolation structure formed through the first wafer and above the bottom surface of the first wafer, wherein the isolation structure has a buried portion and a protruding portion, and the protruding portion of the isolation structure is above the bottom surface of the first wafer; a passivation layer formed on the protruding portion of the isolation structure; a recess formed adjacent to the protruding portion of the isolation structure; and a color filter layer filling the recess, wherein a top surface of the color filter layer is substantially level with a top surface of the passivation layer. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for forming a backside illuminated image sensor device structure, comprising:
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forming a grid structure in a first substrate; forming a transistor device over the grid structure; forming an interconnect structure over the transistor device; forming a second substrate over the interconnect structure, wherein the interconnect structure is between the first substrate and the second substrate; removing a portion of the first substrate from a bottom surface of the first substrate to form an etched surface on the first substrate, such that the grid structure protrudes above the etched surface of the first substrate and defines a recess adjacent to the grid structure; and forming a color filter layer in the recess. - View Dependent Claims (16, 17, 18, 20, 21)
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19. (canceled)
Specification