Photodetector IC Layout for Intrinsic-Field Charge Transfer
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Solution Overview
Problem
Existing integrated devices for massively-parallel sample analyses are limited by their large size, lack of portability, requirement of skilled technicians, high power needs, and high costs, making them unsuitable for point-of-care genetic sequencing and personalized medicine.
Innovation Solution
The development of an integrated circuit with a photodetection region that induces an intrinsic electric field to efficiently transfer charge carriers to charge storage regions, along with transfer gates to control the transfer of charge carriers, enhancing the rate and efficiency of charge transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional photodetector designs are used, then device structure is simple, but charge transfer efficiency is low
Solution Approach 1:
The photodetector is divided into distinct functional regions: a photodetection region for generating charge carriers and a charge storage region for collecting them. This segmentation allows each region to be optimized for its specific function, improving charge transfer efficiency while maintaining manageable device complexity through modular design.
Solution Approach 2:
The patent introduces a vertical stacking architecture where the photodetection region and charge storage region are positioned at different depths within the device. This three-dimensional arrangement enables efficient charge carrier separation and transfer along the vertical dimension, achieving high charge transfer efficiency without requiring complex lateral routing structures.
2Productivity
If existing integrated devices are used for massively-parallel sample analyses, then analysis capability is available, but device size is large and portability is poor
Solution Approach 1:
The patent combines multiple functions into a single integrated photodetector device: photodetection, charge generation, charge separation, and charge storage all occur within one compact structure. This merging eliminates the need for separate components and complex interconnections, enabling massively-parallel sample analysis capability in a miniaturized form factor that improves portability.
Solution Approach 2:
The charge storage region is positioned adjacent to and integrated with the photodetection region, with charge carriers being transferred directly between these nested functional zones. This nested arrangement maximizes space utilization and enables high-capacity charge storage in a minimal volume, supporting massively-parallel analysis while keeping the device compact and portable.
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 solution enables faster and more efficient charge transfer, facilitating the development of compact, portable, and user-friendly devices for massively-parallel sample analyses, thereby improving the accessibility of genetic sequencing and personalized medicine.
Implementation Method 1
a photodetection region configured to receive, in a first direction, incident photons, generate, in response to receiving the incident photons, charge carriers
Implementation Method 2
induce, in the first direction, a first intrinsic electric field
Data Source
AI summary
The present disclosure provides techniques for improving the rate and efficiency of charge transfer within an integrated circuit configured to receive incident photons. Some aspects of the present disclosure relate to integrated circuits that are configured to induce one or more intrinsic electric fields that increase the rate and efficiency of charge transfer within the integrated circuits. Some aspects of the present disclosure relate to integrated circuits configured to induce a charge carrier depletion in the photodetection region(s) of the integrated circuits. In some embodiments, the charge carrier depletion in the photodetection region(s) may be intrinsic, in that the depletion is induced even in the absence of external electric fields applied to the integrated circuit. Some aspects of the present disclosure relate to processes for operating and/or manufacturing integrated devices as described herein.