Photodiode structure for improving quantum efficiency of CMOS image sensor
A photodiode and image sensor technology, applied in circuits, electrical components, semiconductor devices, etc., can solve the problems of increasing residual electrons, inter-band tunneling leakage, dark current increase, etc., to increase the width of the depletion region and improve the quantum efficiency Effect
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[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0025] A photodiode structure for improving the quantum efficiency of a CMOS image sensor provided by the present invention is located in a lightly doped substrate, including a reset transistor, a transfer transistor, a PN photodiode, a pixel unit isolation region, a well region and a ring-shaped silicon region; The two ends of the transfer transistor are respectively connected to the reset transistor and the PN photodiode, and the well region is the well of the reset transistor; the region formed by the reset transistor, the transfer transistor and the PN photodiode is ring-shaped Surrounded by the pixel unit isolation region, the part of the pixel unit isolation region immediately adjacent to the reset transistor is shallow...
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