光接收元件和光接收装置

By designing a stacked structure of photoelectric conversion unit and charge accumulation unit in the light receiving element, the kTC noise problem of TOF sensor in a wide dynamic range is solved, improving the accuracy of distance measurement and signal-to-noise ratio.

CN114631189BActive Publication Date: 2026-07-17SONY SEMICON SOLUTIONS CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SONY SEMICON SOLUTIONS CORP
Filing Date
2020-12-03
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

The optical receiving element of a TOF sensor needs to reduce the impact of kTC noise while ensuring a wide dynamic range in order to achieve high-precision distance measurement.

Method used

The design employs a light-receiving element, including a photoelectric conversion unit and first and second charge accumulation units. Each unit consists of a stack of electrodes, a first insulating layer, and a semiconductor layer. Charges are first sorted to the charge accumulation unit and then transferred to the floating diffusion region, reducing the impact of kTC noise.

Benefits of technology

By reducing the impact of kTC noise, the distance measurement accuracy and signal-to-noise ratio of the TOF sensor are improved, and charge accumulation with a wide dynamic range is achieved.

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Abstract

提供了一种光接收元件，包括：光电转换单元(PD)，其被设置在半导体基板(200)中并将光转换为电荷；第一电荷累积单元(MEM)，电荷从光电转换单元传输到第一电荷累积单元(MEM)；第二电荷累积单元(MEM)，电荷从光电转换单元传输到第二电荷累积单元。第一电荷累积单元和第二电荷累积单元中的每个包括构成叠层的电极(154a)、第一绝缘层和半导体层(102a)。
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