Polysilicon Wavelength Conversion Element for Integrated Photodetectors
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Solution Overview
Problem
Current photodetector manufacturing processes are costly and complex due to the use of externally added spectral filters, which are not integrated with the photodetectors and require separate manufacturing steps, leading to increased costs and technical complexity.
Innovation Solution
Integration of a wavelength conversion element, such as a spectral filter, directly into the integrated circuit with the photodiode, using the same materials as the transistor gate region or interlayer dielectric, allowing for simultaneous manufacturing with other electronic components, reducing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spectral filters are constructed independently and added as external components, then wavelength selection functionality is achieved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent merges the spectral filter structure with the transistor gate structure by forming both using the same polysilicon material in the same manufacturing process. The filter structure is integrated directly into the transistor device layer, eliminating the need for separate external filter components and their associated assembly processes.
Solution Approach 2:
The polysilicon structure serves dual functions: as the transistor gate material for device operation and as the spectral filter material for wavelength selection. This multi-functionality reduces the total component count and simplifies the manufacturing process by using a single material system for both purposes.
2Reliability
If spectral filters are constructed independently and added as external components, then wavelength selection functionality is achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges the spectral filter structure with the transistor gate structure by forming both using the same polysilicon material in the same manufacturing process. The filter structure is integrated directly into the transistor device layer, eliminating the need for separate external filter components and their associated assembly processes.
Solution Approach 2:
The patent uses the same homogeneous material (polysilicon) for both the transistor gate and the spectral filter structure. This material uniformity allows both components to be fabricated using identical deposition and processing techniques, reducing manufacturing complexity and cost.
3Productivity
If multiple sensors with different sensitivities are produced on a single chip, then productivity and versatility improve, but device complexity increases
Solution Approach 1:
The patent applies different spectral filter characteristics to different regions of the chip by varying the polysilicon structure parameters (thickness, pattern, geometry) in specific locations. This allows each sensor region to have tailored sensitivity characteristics while using the same base material and fabrication process throughout the chip.
Solution Approach 2:
The patent achieves different sensor sensitivities by changing the physical parameters of the polysilicon filter structure in different chip regions, such as varying the thickness, width, or pattern density of the polysilicon features. These parameter variations enable multiple sensor types (e.g., RGB sensors) to be produced on a single chip using a unified manufacturing approach.
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 manufacturing process, reduces costs, and enables the production of multiple sensors with different sensitivities on a single chip, such as RGB sensors, while maintaining ambient light sensitivity comparable to the human eye, suitable for various applications including light intensity control and color temperature evaluation.
Implementation Method 1
spectral filters for wavelength selection for photodetectors
Data Source
AI summary
An integrated circuit arrangement is provided, including a transistor including a gate region; and a wavelength conversion element, wherein the wavelength conversion element may include the same material or same materials as the gate region of the transistor.