Image sensor and method for manufacturing the sensor

Abstract

An image sensor and manufacturing method thereof are provided. The image sensor can include a gate on a semiconductor substrate, first and second p-type doping areas below the gate, a third p-type doping area adjacent to the first p-type doping area, and a fourth p-type doping area adjacent to the third p-type doping area. An n-type doping area can be provided in the semiconductor substrate such that at least a portion of the n-type doping area is disposed below the first, third, and fourth p-type doping areas. A floating diffusion area can be provided adjacent to the second p-type doping area. The invention can prevent the electrons of the channel area from flowing back toward the photodiode, so that noise and image lagging can be reduced.

Description

technical field [0001] The present invention relates to an image sensor and a manufacturing method thereof, and more particularly, to an image sensor capable of improving electron transfer efficiency by adjusting the doping concentration of a channel region. Background technique [0002] Image sensors are semiconductor devices that convert optical images into electrical signals. Image sensors may be classified into Charge Coupled Device (CCD) image sensors or Complementary Metal Oxide Semiconductor (CMOS) image sensors. [0003] Generally, a CMOS image sensor provides metal-oxide-semiconductor (MOS) transistors corresponding to the number of pixels through CMOS technology and uses peripheral devices such as control circuits and signal processing circuits to sequentially detect outputs in a switching manner. [0004] In addition, a CMOS image sensor generally includes a photodiode for receiving light to generate photocharges and MOS transistors arranged according to unit pix...

AI Technical Summary

Problems solved by technology

Noise or image lag (lag) can occur if charge flows back toward the photodiode

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