Organic Compound for Green Light Selective 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 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 includes a C6 to C30 hydrocarbon cyclic group or heterocyclic group with specific functional groups, is used in a photoelectric device to selectively absorb light in the green wavelength region and exhibit improved thermal stability, enhancing the 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 simple and manufacturing is mature, 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 achieves higher sensitivity not by increasing physical area but by enhancing the absorption efficiency per unit area through molecular design and optical properties
Solution Approach 2:
The patent employs composite material strategy by combining organic compound with specific molecular structures (containing electron-donating and electron-withdrawing groups) to create a material that exhibits both high absorption efficiency and selective wavelength response, resolving the sensitivity limitation of conventional silicon photodiodes
2Reliability
If organic material is used to replace silicon photodiode, then sensitivity and integration are improved, but thermal stability becomes problematic
Solution Approach 1:
The patent applies local quality principle by introducing specific functional groups (electron-donating and electron-withdrawing groups) at specific positions within the organic molecule. This localized structural modification enhances the overall thermal stability of the material while preserving its optical absorption properties
Solution Approach 2:
The patent modifies the chemical structure parameters of the organic compound by incorporating rigid fused ring structures and specific functional groups, which increases the glass transition temperature and thermal decomposition temperature, thereby improving thermal stability without sacrificing sensitivity
3Reliability
If organic material with high extinction coefficient is used, then sensitivity and wavelength selectivity are improved, but device complexity increases
Solution Approach 1:
The patent designs an organic compound that simultaneously performs multiple functions: it acts as both the photodiode active layer and the color filter. The single molecular structure provides both high sensitivity through high extinction coefficient and wavelength selectivity through selective absorption, eliminating the need for separate color filter components and reducing overall device complexity
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 selectivity for green light absorption and maintains performance under high temperature conditions, improving the sensitivity and thermal stability of photoelectric devices and image sensors.
Implementation Method 1
A photoelectric device converts light into an electrical signal using photoelectric effects
Implementation Method 2
The 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
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.