Organic Image Sensor Using Wavelength-Selective Compound
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Solution Overview
Problem
Silicon photodiodes used in image sensors have limited sensitivity due to small absorption areas, necessitating the development of organic materials that can selectively absorb light in specific wavelength regions and improve heat resistance and processability.
Innovation Solution
An organic device with a compound represented by Chemical Formula 1, featuring a specific molecular structure that allows selective light absorption in narrow wavelength regions, is integrated into an image sensor, enhancing sensitivity and electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If silicon photodiode is used to achieve high resolution with small pixel, then device size is reduced, but sensitivity deteriorates due to small absorption area
Solution Approach 1:
The patent changes the material parameter from silicon to organic compound, specifically utilizing compounds with different molecular structures (Formula 1 with various L1, L2, R1, R2, Ar1, Ar2 configurations) that have high extinction coefficients. This material substitution enables the organic photodiode to achieve higher sensitivity than silicon photodiodes while maintaining small pixel dimensions, as the organic material's intrinsic optical properties compensate for the reduced absorption area.
2Adaptability or versatility
If organic material is used to replace silicon and color filter, then sensitivity and integration are improved, but wavelength selectivity and heat resistance need enhancement
Solution Approach 1:
The patent applies local quality by designing specific molecular structures (Formula 1 with tailored L1, L2, R1, R2, Ar1, Ar2 groups) that confer wavelength-selective absorption characteristics to the organic compound. Different substituent combinations enable selective absorption in blue, green, or red regions, allowing each pixel to have customized optical properties. This molecular-level customization provides wavelength selectivity comparable to or exceeding traditional color filters while maintaining the integration benefits of organic materials.
3Adaptability or versatility
If organic material is used to replace silicon and color filter, then sensitivity and integration are improved, but heat resistance needs improvement
Solution Approach 1:
The patent employs composite material strategies by combining the organic photoactive compound (Formula 1) with host materials, dopants, and encapsulation layers. The composite structure leverages the high extinction coefficient and wavelength selectivity of the organic compound while the host matrix and protective encapsulation provide thermal stability and heat resistance, thereby maintaining integration advantages while mitigating the inherent heat sensitivity of organic materials.
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 device selectively absorbs light in red, green, or blue wavelength regions, improving sensitivity and wavelength selectivity, and is applied in image sensors to enhance electrical characteristics and reduce device size.
Implementation Method 1
A photoelectric device converts light into an electrical signal using photoelectric effects
Implementation Method 2
An organic material has a high extinction coefficient and selectively absorbs light in a particular wavelength region depending on a molecular structure
Data Source
AI summary
Disclosed are an organic device including a first electrode and a second electrode facing each other and an active layer between the first electrode and the second electrode, wherein the active layer includes compound represented by Chemical Formula 1, and an image sensor including the same.In Chemical Formula 1, L1, L2, R1, R2, Ar1, Ar2, X1, X2, m1, m2, n1, and n2 are the same as described in the detailed description.