Crosslinked Organic Molecules for Image Sensor Light Absorption
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Solution Overview
Problem
Silicon photodiodes in image sensors have limited sensitivity due to small absorption areas, necessitating the development of alternative organic materials that can enhance light absorption and wavelength selectivity.
Innovation Solution
An optoelectronic material comprising crosslinked first and second organic molecules, specifically thiophene derivatives, which selectively absorb light in visible ray regions, including blue, red, and green wavelengths, thereby improving light absorption characteristics and wavelength selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon photodiode is used in image sensor, then device structure is simple and manufacturing isๆ็, but absorption area is small and sensitivity is deteriorated
Solution Approach 1:
The patent changes the material parameters by using organic compounds with specific molecular structures (thiophene derivatives with electron donor and acceptor units) that have high extinction coefficients and strong light absorption capabilities, allowing for improved sensitivity without requiring larger pixel areas
Solution Approach 2:
The patent employs composite organic materials consisting of electron donor units and electron acceptor units connected through conjugated bonds, creating a material system with enhanced light absorption properties that overcomes the limitations of conventional silicon photodiodes
2Use of energy by moving object
If organic material is used to replace silicon photodiode, then light absorption characteristics are improved, but wavelength selectivity must be enhanced
Solution Approach 1:
The patent applies local quality by designing specific molecular structures with electron donor and electron acceptor units at different positions, where each unit contributes specific optical properties, enabling the material to selectively absorb certain wavelengths while maintaining strong overall absorption
Solution Approach 2:
The patent modifies the optical parameters by adjusting the molecular structure of the organic compound, specifically by selecting appropriate electron donor and acceptor units and their connectivity, which controls the wavelength selectivity and absorption characteristics of the material
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 crosslinked organic molecules enhance light absorption and prevent crystallization, resulting in high external quantum efficiency and selective absorption in narrow wavelength regions, improving photoelectric conversion efficiency in image sensors.
Implementation Method 1
the first organic molecule and the second organic molecule having wavelength selectivity in a visible ray region
Implementation Method 2
An optoelectronic device converts light into an electrical signal
Data Source
AI summary
An optoelectronic material includes a first organic molecule and a second organic molecule crosslinked with each other, the first organic molecule and the second organic molecule having wavelength selectivity in a visible ray region.