Light Detector Layout With Quenching and Light-Shielded Circuitry
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Solution Overview
Problem
Current light detectors face challenges in enhancing reliability, particularly in suppressing avalanche breakdown and improving signal-to-noise ratio, which affects their performance in detecting incident light effectively.
Innovation Solution
The light detector design incorporates a p-n junction structure with a quenching part and a control circuit to manage avalanche breakdown, along with a resin or metal layer that absorbs or reflects light, and filter layers to reduce incident light on the circuit elements, enhancing stability and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light detector uses a semiconductor region to detect incident light, then detection capability is achieved, but avalanche breakdown occurs reducing reliability
Solution Approach 1:
The patent introduces a quenching part as an intermediary element between the first and second semiconductor regions. This quenching part suppresses avalanche breakdown by providing a controlled path for charge carriers, preventing the harmful avalanche effect while maintaining the detection functionality of the semiconductor regions.
Solution Approach 2:
The patent utilizes the avalanche breakdown phenomenon constructively by designing the quenching part to control and direct the avalanche process. Instead of completely preventing avalanche effects, the design converts the harmful uncontrolled avalanche breakdown into a controlled process that actually enhances detection capability while maintaining reliability.
2Measurement precision
If circuit elements are exposed to incident light, then light detection function is enhanced, but signal-to-noise ratio deteriorates due to interference
Solution Approach 1:
The patent divides the device into functionally separate regions: a first semiconductor region for light detection, a second semiconductor region for circuit elements, and a quenching part separating them. This segmentation allows the detection region to be exposed to light while the circuit region is protected from light interference, thereby improving signal-to-noise ratio.
Solution Approach 2:
The quenching part serves as an intermediary structure between the light-sensitive first semiconductor region and the light-sensitive circuit elements in the second region. This intermediary element allows the circuit elements to remain protected from direct light exposure while still enabling the detection function to operate effectively.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses avalanche breakdown, improves signal-to-noise ratio, and increases the reliability of light detection, allowing for more accurate and stable operation of the light detector.
Implementation Method 1
The first layer includes a resin that absorbs or reflects light
Implementation Method 2
a light detector that detects light incident on a semiconductor region
Implementation Method 3
manage avalanche breakdown
Data Source
AI summary
According to one embodiment, a light detector includes a first semiconductor layer of a first conductivity type, a first region, a quenching part, a second region, and a first layer. The first region is located on a portion of the first semiconductor layer, includes a first-conductivity-type first semiconductor region that has a higher first-conductivity-type impurity concentration than the first semiconductor layer, and includes a second semiconductor region of a second conductivity type provided on the first semiconductor region. The quenching part is electrically connected to the second semiconductor region. The second region is located on another portion of the first semiconductor layer, includes a second-conductivity-type third semiconductor region, and includes a first-conductivity-type fourth semiconductor region provided on a portion of the third semiconductor region. The first layer is located on the second region and includes a resin that absorbs or reflects light.