Patent ID: 8487349

Claim:
A light-sensing pixel, having a p type doped region, in a CMOS image sensor, comprising: a first doped charge collecting region buried within the p type doped region and configured to operate as a depleted potential well; a first vertical trench transistor extending from near the surface of the image sensor to the first charge collecting region; a first n+ type doped region located at the surface of the image sensor and coupled to the first vertical trench transistor; a second doped charge collecting region buried within the p type doped region, the second charge collecting region vertically separated from the first charge collecting region by the p type doped region and configured to operate as a depleted potential well; a second vertical trench transistor extending from near the surface of the image sensor to the second charge collecting region; and a second n+ type doped region located at the surface of the image sensor and coupled to the second vertical trench transistor.