Photoelectric Conversion Element Spot Size Detection
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Solution Overview
Problem
Current photoelectric conversion elements are unable to effectively detect the spot size of incident light, which is essential for applications requiring precise light detection and analysis.
Innovation Solution
A photoelectric conversion element with two principal surfaces, featuring a first and second sensitive part, where the first sensitive region receives incident light and forms a pattern to decrease its ratio as the irradiation region increases, allowing for detection of the spot size by generating currents corresponding to the intensity and position of the light, using a combination of semiconductor substrates, passivation layers, and electrode layers to enhance sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional photoelectric conversion element with a single sensitive region is used, then the structure is simple, but it cannot detect the spot size of incident light
Solution Approach 1:
The photoelectric conversion element is divided into multiple sensitive parts (first sensitive part and second sensitive part) with different sensitive regions. This segmentation allows each part to contribute differently to the detection signal, enabling spot size detection through comparison of signals from different regions while maintaining a relatively simple overall structure.
Solution Approach 2:
Different sensitive parts are assigned different sensitive regions with specific characteristics. The first sensitive part has a sensitive region optimized for certain detection parameters while the second sensitive part has a different sensitive region configuration. This local differentiation enables the system to extract spot size information from the differential response to incident light.
2Measurement precision
If the first sensitive region covers a large area to capture more light, then light intensity detection is improved, but the ratio of first sensitive region to second sensitive region becomes less sensitive to spot size changes
Solution Approach 1:
The patent optimizes the area ratio parameter between the first sensitive region and the second sensitive region. By carefully selecting this ratio, the system achieves maximum sensitivity to spot size changes. The specific ratio is determined to balance light capture capability with the ability to detect changes in illumination area, ensuring that the differential signal response is maximized for spot size detection.
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
Enables the detection of the spot size of incident light with high sensitivity and accuracy, improving the capability to analyze light intensity and position, suitable for applications in light detection and three-dimensional sensing.
Implementation Method 1
a photoelectric conversion substrate having two principal surfaces, and includes a first sensitive part and a second sensitive part that are separated from each other... the first sensitive region receives at least a part of incident light incident on the principal surface
Data Source
AI summary
A photoelectric conversion element for detecting the spot size of incident light. The photoelectric conversion element includes a photoelectric conversion substrate having two principal surfaces, and the substrate includes a first sensitivity part and a second sensitivity part that are separated from each other. When a sensitivity area appearing on the principal surface of the first sensitivity part is defined as a first sensitivity area and a sensitivity area appearing on the principal surface of the second sensitivity part is defined as a second sensitivity area, the first sensitivity area receives at least a portion of incident light incident on a light receiving surface, and a pattern is formed such that an increase in an irradiation area of the principal surface irradiated with the incident light reduces the ratio of the first sensitivity area to the second sensitivity area in the irradiation area.