Photoelectric Conversion Device with Light-Emitting Material
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Solution Overview
Problem
Existing photoelectric conversion devices face errors in signal quantity due to thickness variations in the photoelectric conversion layers, which affect the dynamic range and accuracy of light conversion, especially when light intensity is high, as the light incident on the photoelectric conversion element within the semiconductor substrate is influenced by the thickness of the element above the substrate.
Innovation Solution
Incorporating a light-emitting material that absorbs incoming light and emits photoluminescent light, allowing the second photoelectric conversion portion to efficiently convert this light into electrical charges, thereby reducing errors caused by thickness variations and expanding the dynamic range by using both the first and second photoelectric conversion portions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the photoelectric conversion element above the substrate is used to receive light, then the device can operate, but the thickness of this element causes signal errors when light intensity is high
Solution Approach 1:
The photoelectric conversion function is segmented into two independent portions: a first photoelectric conversion portion above the substrate and a second photoelectric conversion portion within the substrate. Each portion independently converts light to electrical charges, allowing the system to overcome the thickness-related signal errors by using the second portion that is not affected by the upper layer's thickness variations.
2Measurement precision
If a second photoelectric conversion element is added within the substrate, then signal accuracy improves, but device complexity increases
Solution Approach 1:
The first and second photoelectric conversion portions are merged into a single integrated photoelectric conversion device structure. Both portions work together within the same device, sharing common electrodes and substrate, which reduces overall system complexity compared to using separate independent devices while maintaining improved signal accuracy.
3Use of energy by moving object
If the thickness of the photoelectric conversion element above the substrate is increased, then light absorption improves, but signal errors increase due to thickness variations
Solution Approach 1:
The first photoelectric conversion portion acts as an intermediary that converts incident light to electrical charges and photoluminescent light. The second photoelectric conversion portion then converts the photoluminescent light to additional electrical charges. This intermediary conversion process allows the system to achieve high light absorption efficiency while the second portion, being thickness-independent, ensures accurate signal measurement.
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
The solution enhances the dynamic range of the photoelectric conversion device by minimizing errors in signal quantity resulting from thickness errors and allows for high luminance conversion, effectively handling a wide range of light intensities and wavelengths, thus improving the device's accuracy and resolution.
Implementation Method 1
Incorporating a light-emitting material that absorbs incoming light and emits photoluminescent light
Implementation Method 2
a first photoelectric conversion portion disposed between the upper electrode and the lower electrode, a second photoelectric conversion portion
Data Source
AI summary
A device uses a light-emitting material. The device includes an upper and a lower electrode, a first photoelectric conversion portion disposed between the upper electrode and the lower electrode, a second photoelectric conversion portion, a first readout circuit connected to the first photoelectric conversion portion, and a second readout circuit connected to the second photoelectric conversion portion. The second photoelectric conversion portion converts light emitted from the light-emitting material into electrical charges.