Organic Compound for Green-Wavelength Image Sensor Sensitivity
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Solution Overview
Problem
Silicon photodiodes used in image sensors have limited sensitivity due to their small absorption area, necessitating the development of alternative materials that can selectively absorb light in specific wavelength regions and maintain efficiency at high temperatures.
Innovation Solution
A compound represented by Chemical Formula 1, which selectively absorbs light in the green wavelength region and exhibits improved thermal stability, is used in an organic photoelectric device, enhancing the sensitivity and efficiency of image sensors and electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon photodiode is used in image sensor, then device structure is well-established and manufacturing is feasible, but sensitivity deteriorates due to smaller absorption area in small pixels
Solution Approach 1:
The patent changes the material parameter from silicon to organic compound, which fundamentally alters the absorption characteristics. The organic compound in Chemical Formula 1 achieves high absorption coefficient in green wavelength region (500-600 nm) despite the small pixel area, resolving the contradiction between small absorption area and sensitivity requirement
Solution Approach 2:
The patent employs an organic compound comprising specific molecular structures (Ar1, Ar2, X, R1-R3 groups) as a composite material solution. This organic photodiode material combines light-absorbing moieties with electron-donating or electron-withdrawing groups to achieve both high sensitivity and thermal stability in small pixel configurations
2Reliability
If organic material is used to replace silicon photodiode, then sensitivity and integration are improved, but thermal stability may deteriorate under high temperature conditions
Solution Approach 1:
The patent modifies the thermal parameter by designing an organic compound with specific structural features (rigid aromatic groups Ar1 and Ar2, heteroatoms X) that enhance thermal stability. The compound maintains its photoelectric properties and structural integrity under high temperature conditions, resolving the thermal stability concern of organic materials
Solution Approach 2:
The patent introduces specific functional groups and molecular structures at key positions within the organic compound to locally enhance thermal stability. The Ar1 and Ar2 groups with specific substituents provide localized thermal resistance while maintaining overall photoelectric performance
3Measurement precision
If pixel size is reduced for high resolution, then image quality is improved, but absorption area decreases leading to deteriorated sensitivity
Solution Approach 1:
The patent changes the material composition parameter to organic compound, which provides high absorption coefficient and selective wavelength absorption. This allows small pixels to maintain high sensitivity despite reduced size, enabling high resolution without sacrificing sensitivity
Solution Approach 2:
The patent utilizes the wavelength-selective absorption property of the organic compound, which absorbs light selectively in the green region (500-600 nm). This color-selective absorption mechanism enables small pixels to efficiently capture specific wavelength ranges, maintaining sensitivity even at reduced pixel sizes for high resolution
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 achieves high sensitivity and selectivity in the green wavelength region while maintaining performance under high temperature conditions, improving the overall efficiency of photoelectric devices and image sensors.
Implementation Method 1
A photoelectric device converts light into an electrical signal using photoelectric effects
Data Source
AI summary
A compound of Chemical Formula 1, and an organic photoelectric device, an image sensor, and an electronic device including the same are disclosed:In Chemical Formula 1, each substituent is the same as defined in the detailed description.