Patent ID: 8368787
Filing Date: 2013-02-05
Classification: H01L

Abstract:
1. A single-plate color image sensor, comprising: an imaging area including a plurality of cells arrayed in a matrix on a semiconductor substrate, each of the cells including first to third avalanche photodiodes, each of the first to third avalanche photodiodes respectively including: first to third anode regions buried in an upper portion of the semiconductor substrate; first to third cathode regions buried in the upper portion of the semiconductor substrate separated from each of the first to third anode regions in a direction parallel to the surface of the semiconductor substrate; and first to third avalanche multiplication regions defined between each of the first to third anode regions and each of the first to third cathode regions, each of the first to third avalanche multiplication regions having an impurity concentration less than each of the first to third anode regions and each of the first to third cathode regions; wherein, for at least one of the first to third avalanche photodiodes, depths of each of the first to third anode regions and each of the first to third cathode regions from the surface of the semiconductor substrate are different from each other.