Multicolor Photodetector Vertical Integration with Readout Circuit
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Solution Overview
Problem
Current multicolor photodetectors have complex structures and require intricate growth schemes, making them difficult to fabricate and accurately arrange layers on a substrate, which hampers their operational accuracy.
Innovation Solution
A method involving the integration of a readout integrated circuit with a first and second photodetection layer on a semiconductor device, using connecting members to electrically link these layers, simplifying the structure and fabrication process while ensuring precise arrangement based on a pixel structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a growth scheme is used to fabricate multicolor photodetector with first layer and second layer, then the photodetector can detect multiple wavelengths of light, but the structure becomes relatively thick and complex requiring complex growth scheme
Solution Approach 1:
The patent transitions from horizontal planar arrangement of photodetection layers to vertical stacking architecture. Multiple photodetection layers detecting different wavelengths are stacked in the vertical dimension, allowing compact integration while maintaining multicolor detection capability and reducing overall device footprint.
Solution Approach 2:
The patent employs a heterogeneous integration approach where a single substrate supports multiple types of photodetection layers with different wavelength sensitivities. This universal platform enables one device to perform multiple detection functions across different spectral ranges without requiring separate devices for each wavelength.
2Adaptability or versatility
If heterogeneous integration scheme is used to fabricate multicolor photodetector with first layer and second layer, then the photodetector can detect multiple wavelengths of light, but it is difficult to arrange each layer at preset position on substrate
Solution Approach 1:
The patent incorporates preset positioning structures and alignment features on the substrate before fabricating photodetection layers. These pre-established guides and markers enable precise placement of each layer at predetermined positions during the fabrication process, ensuring accurate spatial arrangement for optimal optical performance.
Solution Approach 2:
The patent introduces intermediary components such as alignment layers, positioning structures, and coupling agents that facilitate precise arrangement of photodetection layers on the substrate. These intermediaries act as mediators between the substrate and photodetection layers, enabling accurate positioning while maintaining flexibility in the heterogeneous integration process.
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 approach simplifies the fabrication of multicolor photodetectors, enhances operational accuracy by allowing precise layer arrangement, and facilitates the detection of multiple wavelengths of light, improving image quality.
Implementation Method 1
a first photodetection layer for detecting first wavelength light from incident light and converting the detected first wavelength light to an electrical signal
Implementation Method 2
a second photodetection layer for detecting second wavelength light from the incident light and converting the detected second wavelength light to an electrical signal
Data Source
AI summary
Provided are a multicolor photodetector and a method of fabricating the same through integration with a readout integrated circuit. The multicolor photodetector may be fabricated by providing an integrated circuit device in which a readout integrated circuit is wired; forming an assembly in which a first photodetection layer for detecting first wavelength light from incident light and a second photodetection layer for detecting second wavelength light from the incident light on the integrated circuit device; and electrically connecting the first photodetection layer and the second photodetection layer to the readout integrated circuit using connecting members.