Photodetection Device Charge Transfer Channels
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Solution Overview
Problem
Current photodetection devices face limitations in achieving high temporal resolution for detecting the timing of incident light due to charge distribution widening and mixing of charge groups as they travel through transfer channels, leading to reduced accuracy in timing detection.
Innovation Solution
The design incorporates a photodetection device with multiple charge transfer channels of varying widths, where the width of the third charge transfer channel is greater than the second, and specific charge accumulation units connected to read circuits to isolate and read charges accurately, improving temporal resolution by reducing charge mixing and increasing the proportion of readable charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple charge transfer channels are used to improve charge isolation, then temporal resolution is improved, but device complexity increases
Solution Approach 1:
The invention segments the charge transfer function into multiple channels that diverge from a common first charge transfer channel. This segmentation provides the temporal resolution benefits of multiple channels while maintaining a relatively simple structure where all channels originate from a single parent channel, reducing overall device complexity.
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 enhances the temporal resolution in detecting the timing of incident light by effectively isolating and reading charges, reducing the impact of charge mixing and widening charge distribution, thereby improving the accuracy and efficiency of light detection.
Implementation Method 1
a photoelectric converter that generates charge
Data Source
AI summary
A photodetection device includes: a photoelectric converter generating charge; a first transfer channel having first and second ends, the first end being connected to the photoelectric converter, charge from the photoelectric converter being transferred from the first end toward the second end; a second transfer channel diverging from the first transfer channel at a first position; a third transfer channel diverging from the first transfer channel at a second position, further than the first position from the first end; a first charge accumulator accumulating charge transferred through the second transfer channel; a second charge accumulator accumulating charge transferred through the third transfer channel; a first gate electrode switching between transfer/cutoff of charge in the first transfer channel; and at least one second gate electrode switching between transfer/cutoff of charge in the second and third transfer channels, the third transfer channel being wider than the second transfer channel.