Organic Compound for Green Light Sensing in Image Sensors
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Solution Overview
Problem
Conventional silicon photodiodes used in image sensors have limited sensitivity due to smaller absorption areas, necessitating the development of organic materials that can replace silicon and improve sensitivity by selectively absorbing light in specific wavelength regions.
Innovation Solution
A compound represented by Chemical Formula 1, which includes a substituted or unsubstituted 5- or 6-membered aromatic ring, is used in an organic photoelectric device, allowing it to sense light in the green wavelength region with improved thermal stability and efficiency, and is integrated into an image sensor and electronic device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If silicon photodiode size is reduced to achieve higher resolution, then pixel density improves, but sensitivity deteriorates due to smaller absorption area
Solution Approach 1:
The patent changes the material parameter from silicon to organic compound, which fundamentally alters the absorption characteristics. The organic compound enables selective wavelength absorption with higher extinction coefficients, allowing small pixels to maintain high sensitivity by optimizing the absorption parameter rather than increasing physical size
Solution Approach 2:
The patent uses composite molecular structures combining electron-donating groups and electron-accepting groups in specific arrangements. This composite approach creates materials with tailored optical properties, achieving both small size compatibility and high sensitivity through optimized molecular composition rather than bulk material properties
2Reliability
If organic material is used to replace silicon, then sensitivity and integration improve, but thermal stability becomes a concern
Solution Approach 1:
The patent optimizes molecular parameters including HOMO-LUMO energy gaps, thermal decomposition temperatures, and glass transition temperatures. By carefully selecting and tuning these parameters through molecular design, the organic compound achieves both high sensitivity and adequate thermal stability for device operation
Solution Approach 2:
The patent introduces specific functional groups and molecular moieties at localized positions within the organic compound structure. These local structural modifications enhance specific properties such as thermal stability and charge transport while maintaining the overall high sensitivity characteristics of the organic material
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 compound enhances the sensitivity and efficiency of the organic photoelectric device by selectively absorbing light in the green wavelength region, improving the integration and performance of image sensors and electronic devices.
Implementation Method 1
A photoelectric device converts light into an electrical signal using photoelectric effects
Implementation Method 2
The organic material has a relatively high extinction coefficient and selectively absorbs/sense light in a particular wavelength region depending on a molecular structure
Data Source
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AI summary
A compound for an organic photoelectric device is represented by Chemical Formula 1, and an organic photoelectric device, an image sensor and an electronic device include the same.