Organic Compound Enhances Green Light Sensitivity 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 enhance light absorption 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 integrated into an organic photoelectric device, allowing for enhanced sensitivity and efficiency even under high temperature conditions.
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 material, which fundamentally alters the absorption characteristics. The organic material achieves higher absorption coefficient in the green wavelength region (500-580 nm), enabling effective light absorption even in reduced pixel areas while maintaining or improving sensitivity.
Solution Approach 2:
The patent employs composite material strategy by combining organic photoelectric conversion material with specific molecular structures containing heteroatoms (S, Se, Te) and functional groups (C=O, C=S, C=Se, C=Te). This composite approach at molecular level creates material with enhanced green light absorption and improved thermal stability, resolving the sensitivity issue in small pixels.
2Reliability
If organic material is used to replace silicon photodiode, then absorption coefficient increases and color filter function is integrated, but thermal stability becomes a concern
Solution Approach 1:
The patent modifies the molecular structure parameters of organic material by incorporating heavy heteroatoms (S, Se, Te) and specific functional groups, which increases the absorption coefficient in green region. Simultaneously, the molecular design enhances thermal stability through rigid core structures and appropriate substituent selection, allowing the material to maintain performance at high temperatures.
Solution Approach 2:
The patent applies local quality principle by designing specific molecular regions with different functions: the core structure provides thermal stability through rigid frameworks, while specific functional groups and heteroatom positions are optimized for green light absorption. This localized optimization allows simultaneous achievement of high absorption coefficient and thermal stability.
3Measurement precision
If pixel size is reduced for high resolution, then image sensor resolution improves, but absorption area decreases leading to sensitivity loss
Solution Approach 1:
The patent changes the optical parameter of the photoelectric material to achieve higher absorption coefficient in the green wavelength region. This parameter change allows the material to absorb light more efficiently, compensating for the reduced absorption area in smaller pixels and maintaining sensitivity despite pixel size reduction 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 improves the wavelength selectivity and thermal stability of photoelectric devices, image sensors, and electronic devices, maintaining performance and increasing sensitivity without deteriorating at high temperatures.
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, the definition of each substituent is as described in the detailed description.