Peking University

Liqiao Liu

Xiaoyan Liu

Gang Du

The present application discloses a UTBB photodetector pixel unit, array and method, including: a silicon film layer, a buried oxide layer, a charge collection layer and a substrate, the silicon film layer, the buried oxide layer, the charge collection layer and the substrate being arranged in sequence from top to bottom; the silicon film layer includes NMOS transistors or PMOS transistors; the charge collection layer includes charge collection control regions and charge accumulation regions; and the substrate includes an N-type substrate or a P-type substrate. A centripetal electric field is formed around the charge accumulation regions, and photo-generated charges are accumulated in the corresponding pixel units under the action of the centripetal electric field. The existence of the centripetal electric field improves the photoelectric conversion efficiency, suppresses the crosstalk between pixels, saves the area of shallow trench isolation, reduces the size, and makes it more suitable for sub-micron pixels.

UTTB photodetector pixel unit, array and method

The present application discloses a pixel unit and a signal processing method for a pixel unit. The pixel unit includes at least one pixel, and the pixel includes: an N-type main pixel, a P-type main pixel, and a sub-pixel; and the sub-pixel is located between the N-type main pixel and the P-type main pixel; or the pixel includes at least a first pixel and a second pixel that are adjacent to each other; the first pixel includes an N-type main pixel, and the second pixel includes a P-type main pixel; the first pixel and the second pixel share one sub-pixel; the sub-pixel is configured to generate and output a signal difference between the N-type main pixel and the P-type main pixel according to the current. By adding a sub-pixel between two main pixels, the sub-pixel generates and outputs the signal difference between the N-type main pixel and the P-type main pixel according to the current sent by the two main pixels, so that the received signal can be efficiently processed directly to reduce the amount of output data. Since there is no need to increase a circuit, the pixel area will not increase due to a complicated circuit.

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Beijing, China

Liqiao Liu