Ring-Structured Semiconductor Composition for Green-Sensitive Image Sensors
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Solution Overview
Problem
Silicon photodiodes in image sensors suffer from reduced sensitivity due to small absorption areas and require improvements in thermal stability and wavelength selectivity.
Innovation Solution
A composition for a photoelectric device using a semiconductor compound represented by Chemical Formula 1, which selectively absorbs light in the green wavelength region and includes a molecular structure that forms a ring structure, enhancing sensitivity and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If silicon photodiode is used in small pixels for high resolution, then pixel size is reduced, but sensitivity deteriorates due to small absorption area
Solution Approach 1:
The patent changes the material parameter from conventional silicon photodiode to organic semiconductor compound with specific molecular structure (Formula 1), which has higher absorption coefficient in green wavelength region. This allows smaller absorption area while maintaining sensitivity, resolving the contradiction between small pixel size and sensitivity.
Solution Approach 2:
The patent uses composite material approach by combining specific electron donor moiety (Formula 2A or 2B) with electron acceptor moiety (Formula 3A-1 to 3A-8) in a donor-acceptor type structure. This composite molecular design achieves both high absorption coefficient and thermal stability, enabling small pixel size with maintained sensitivity.
2Ease of manufacture
If conventional materials are used in high-temperature process, then manufacturing is simplified, but thermal stability deteriorates
Solution Approach 1:
The patent changes the thermal parameter by designing organic semiconductor compound with specific molecular structure (Formula 1) that inherently possesses high thermal stability. The donor-acceptor type structure with specific moieties provides thermal stability without complicating the manufacturing process, as the compound can be deposited by conventional vacuum deposition.
Solution Approach 2:
The patent replaces conventional silicon photodiode material with organic semiconductor compound that can be processed at lower temperatures and deposited by simple vacuum deposition. This new material is easier to manufacture with while maintaining or improving thermal stability during device operation.
3Measurement precision
If photodiode and color filter are separate components, then wavelength selectivity is achieved, but device complexity increases
Solution Approach 1:
The patent merges the functions of photodiode and color filter into a single organic semiconductor compound layer. The compound's molecular structure provides both photoelectric conversion and wavelength-selective absorption in green region, eliminating the need for separate color filter components and reducing device complexity.
Solution Approach 2:
The organic semiconductor compound performs multiple functions simultaneously: it acts as both the photoelectric conversion layer (photodiode function) and the wavelength-selective filter (color filter function). This multi-functional material simplifies the overall device structure while maintaining wavelength selectivity.
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 composition improves sensitivity and maintains efficiency under high-temperature conditions, allowing for high integration and selective absorption in the green wavelength region.
Implementation Method 1
A photoelectric device may convert light into an electrical signal using photoelectric effects
Data Source
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AI summary
A composition for a photoelectric device includes a compound represented by Chemical Formula 1, and an image sensor and an electronic device including the same: In Chemical Formula 1, each substituent is the same as defined in the detailed description.