Organic Compound for Image Sensor Sensitivity
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Solution Overview
Problem
Silicon photodiodes used in image sensors suffer from reduced sensitivity due to their small absorption area, necessitating the development of alternative materials that can enhance light absorption and sensitivity.
Innovation Solution
A novel organic compound with a high extinction coefficient, capable of selectively absorbing light in specific wavelength regions, is introduced to replace traditional silicon photodiodes, serving as both a photodiode and color filter, and is integrated into near-infrared absorbing and/or blocking films, photoelectric devices, and image sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon photodiodes are used in image sensors, then the device structure is well-established and manufacturing is feasible, but the sensitivity is reduced due to small absorption area
Solution Approach 1:
The patent changes the material parameter from silicon to organic compound, which fundamentally alters the optical absorption characteristics. The organic compound exhibits higher extinction coefficient and different absorption spectrum, enabling improved sensitivity in specific wavelength regions while maintaining compatibility with small pixel dimensions
Solution Approach 2:
The invention employs composite material structure by integrating the organic compound into the existing silicon photodiode architecture. The organic layer works synergistically with the silicon substrate to enhance light absorption efficiency without compromising the structural integrity and manufacturing feasibility of the device
2Measurement precision
If pixel size is reduced to achieve high resolution, then the image sensor resolution is improved, but the absorption area decreases leading to deteriorated sensitivity
Solution Approach 1:
By introducing organic compound with superior optical absorption parameters, the patent decouples the relationship between pixel size and sensitivity. The high extinction coefficient of the organic material allows maintaining high sensitivity even in reduced pixel areas, breaking the traditional trade-off between resolution and sensitivity
Solution Approach 2:
The organic compound serves multiple functions simultaneously: it acts as the light-absorbing active layer, provides wavelength-selective absorption, and enhances overall device sensitivity. This multi-functionality allows small pixels to achieve high resolution while maintaining excellent sensitivity through the same material layer
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 novel compound improves light absorption and sensitivity in the near-infrared region, enhancing the performance of photoelectric devices and image sensors by effectively converting light into electrical signals with improved integration and sensitivity.
Implementation Method 1
The novel compound may have a relatively high extinction coefficient and may selectively absorb light in a particular wavelength region depending on a molecular structure
Implementation Method 2
A photoelectric device may convert light into an electrical signal using photoelectric effects
Data Source
AI summary
Provided are a compound represented by Chemical Formula 1, a photoelectric device, an image sensor, and an electronic device including the same.In Chemical Formula 1, the definition of each substituent is as described in the specification.