Barrier regions for image sensors
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Abstract
Embodiments of the invention provide an image sensor that includes a barrier region for isolating devices. The image sensor comprises a substrate and an array of pixel cells formed on the substrate. Each pixel cell comprises a photo-conversion device. The array comprises a first pixel cell having a first configuration, a second pixel cell having a second configuration, and at least one barrier region formed between the first and second pixel cells for capturing and removing charge. The barrier region comprises a charge accumulation region of a particular conductivity type in a substrate electrically connected to a voltage source terminal. The charge accumulation region accumulates charge and prevents charge transference from a pixel cell or peripheral circuitry on one side of the barrier region to a pixel cell on another side of the barrier region.
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Citations
49 Claims
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1-27. -27. (canceled)
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28. A method of forming an image sensor, the method comprising:
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providing a substrate;
providing an array of pixel cells on the substrate, the array comprising a first pixel cell having a first configuration and a second pixel cell having a second configuration; and
forming at least one barrier region adjacent to at least one pixel cell by forming a charge accumulation region of a particular conductivity type on the substrate and electrically connecting the charge accumulation region to a voltage source terminal. - View Dependent Claims (29, 30, 31, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification