Methods for Manufacturing Arrays for CMOS Imagers
First Claim
1. A method comprising:
- forming at a front side of a substrate a plurality of high aspect ratio trenches having a predetermined trench depth;
forming at the front side of the substrate a plurality of photodiodes, wherein each photodiode is adjacent at least one trench;
forming an oxide layer on inner walls of each trench;
removing the oxide layer;
filling each trench with a highly doped material; and
thinning the substrate from a back side opposite the front side to a predetermined final substrate thickness.
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Abstract
Methods of fabricating complementary metal-oxide-semiconductor (CMOS) imagers for backside illumination are disclosed. In one embodiment, the method may include forming at a front side of a substrate a plurality of high aspect ratio trenches having a predetermined trench depth, and forming at the front side of the substrate a plurality of photodiodes, where each photodiode is adjacent at least one trench. The method may further include forming an oxide layer on inner walls of each trench, removing the oxide layer, filling each trench with a highly doped material, and thinning the substrate from a back side opposite the front side to a predetermined final substrate thickness. In some embodiments, the substrate may have a predetermined doping profile, such as a graded doping profile, that provides a built-in electric field suitable to guide the flow of photogenerated minority carriers towards the front side.
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Citations
20 Claims
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1. A method comprising:
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forming at a front side of a substrate a plurality of high aspect ratio trenches having a predetermined trench depth; forming at the front side of the substrate a plurality of photodiodes, wherein each photodiode is adjacent at least one trench; forming an oxide layer on inner walls of each trench; removing the oxide layer; filling each trench with a highly doped material; and thinning the substrate from a back side opposite the front side to a predetermined final substrate thickness. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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providing a substrate having a predetermined doping profile; forming at a front side of the substrate a plurality of high aspect ratio trenches having a predetermined trench depth; forming at the front side of the substrate a plurality of photodiodes, wherein each photodiode is adjacent at least one trench; forming an oxide layer on inner walls of each trench; removing the oxide layer; filling each trench with a highly doped material; and thinning the substrate from a back side opposite the front side to a predetermined final substrate thickness. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of fabricating a plurality of complementary metal-oxide-semiconductor (CMOS) imagers for backside illumination, comprising:
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forming at a front side of a substrate a plurality of high aspect ratio trenches having a predetermined trench depth; forming at the front side of the substrate a plurality of photodiodes, wherein each photodiode is adjacent at least one trench; forming an oxide layer on inner walls of each trench; removing the oxide layer; filling each trench with a highly doped material; and thinning the substrate from a back side opposite the front side to a predetermined final substrate thickness. - View Dependent Claims (18, 19, 20)
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Specification