LIGHT RECEIVING ELEMENT, DISTANCE MEASURING MODULE AND ELECTRONIC DEVICE
Patent Information
- Application Number
- DE602019069840
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2018-07-18
- Filing Date
- 2019-07-08
- Publication Date
- 2025-05-07
- Estimated Expiration
- 2039-07-08
AI Technical Summary
Existing CAPD sensors face challenges in securing a sufficient photoelectric conversion region due to wiring lines and control lines on the light receiving surface, leading to degraded pixel sensitivity and limited saturation signal amount, which affects the signal-to-noise ratio and ranging accuracy.
A back-illuminated light receiving element with a semiconductor substrate between on-chip lenses and a multilayer wiring layer, where transfer transistors and floating diffusion regions are formed on the front surface, and interpixel separation portions are used to prevent light leakage, enhancing quantum efficiency and aperture ratio.
The back-illuminated design improves quantum efficiency and aperture ratio, leading to enhanced ranging characteristics, increased sensitivity, and better signal-to-noise ratio, while also allowing for thinner substrates and higher electron extraction efficiency.