Organic Compound for Green Light Absorption in Image Sensors
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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 organic materials that can selectively absorb light in specific wavelength regions to improve sensitivity and integration.
Innovation Solution
A compound represented by Chemical Formula 1, which selectively absorbs light in the green wavelength region, is used in an organic photoelectric device, enhancing its absorption efficiency and replacing both the photodiode and color filter, thereby improving sensitivity and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon photodiode is used in image sensor, then device structure is simple and manufacturing is mature, but absorption area is small and sensitivity deteriorates
Solution Approach 1:
The patent changes the material parameter from silicon to organic compound, which fundamentally alters the optical absorption characteristics. The organic compound in Chemical Formula 1 exhibits higher extinction coefficient and selective absorption in green wavelength region, enabling improved sensitivity without requiring larger pixel area.
Solution Approach 2:
The patent employs composite material strategy by combining organic compound with specific molecular structure (Chemical Formula 1) that integrates both photodetector and color filter functions. This composite approach allows simultaneous achievement of high sensitivity and wavelength selectivity within the same material layer.
2Measurement precision
If pixel size is reduced to achieve high resolution, then image sensor resolution improves, but absorption area decreases and sensitivity deteriorates
Solution Approach 1:
The patent changes the optical absorption parameter by using organic compound with high extinction coefficient, which compensates for the reduced absorption area in small pixels. The molecular structure in Chemical Formula 1 is specifically designed to enhance light absorption efficiency, allowing high resolution to be achieved without sacrificing sensitivity.
3Reliability
If organic material is used to replace silicon photodiode, then sensitivity and integration improve, but device structure and material synthesis become more complex
Solution Approach 1:
The patent merges the functions of photodetector and color filter into a single organic compound layer (Chemical Formula 1). This consolidation eliminates the need for separate silicon photodiode and color filter layers, thereby improving sensitivity and integration while actually simplifying the overall device structure despite the complexity of organic material synthesis.
Solution Approach 2:
The organic compound in Chemical Formula 1 serves multiple functions simultaneously: it acts as both the photodetector material and the color filter material. This multi-functionality reduces the number of required layers and components, improving integration while maintaining enhanced sensitivity through selective green light absorption.
4Reliability
If organic material selectively absorbs light in particular wavelength region, then sensitivity in that region improves and integration increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the absorption wavelength parameter by designing the molecular structure of the organic compound to selectively absorb in the green region (500-600 nm). This specific parameter optimization enables high sensitivity in the target wavelength range while the synthesis method described in the patent maintains manufacturing feasibility through controlled chemical reactions.
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 organic photoelectric device achieves high selectivity and efficiency in absorbing light in the green wavelength region, with a maximum absorption wavelength between 500 nm to 600 nm and an absorption coefficient greater than 5.0×10^4 cm^-1, improving the overall sensitivity and integration of image sensors.
Implementation Method 1
A photoelectric device may convert light into an electrical signal using photoelectric effects
Implementation Method 2
An organic material has a relatively high extinction coefficient and selectively absorbs light in a particular wavelength region depending on a molecular structure
Data Source
AI summary
A compound is represented by Chemical Formula 1, and an organic photoelectric device, an image sensor, and an electronic device include the compound.In Chemical Formula 1, each substituent is the same as defined in the detailed description.