Barrier regions for image sensors

摘要

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.