BACKSIDE ILLUMINATED IMAGE SENSOR WITH BIASED LAYER

摘要

A backside illuminated image sensor includes a sensor layer comprising a plurality of photosensitive elements of the pixel array, a circuit layer comprising circuitry associated with the pixel array, a conductive layer formed on a backside surface of the sensor layer, and one or more conductive contacts configured to couple the conductive layer to a bias source in the circuit layer. The biased conductive layer produces an electric field across the photosensitive elements of the pixel array that facilitates charge carrier collection and reduces crosstalk between adjacent photosensitive elements, thereby providing improved quantum efficiency in the image sensor. The image sensor may be implemented in a digital camera or other type of digital imaging device.