Organic Photoelectric Sensor Compound for Small-Pixel Sensitivity
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Solution Overview
Problem
Silicon photodiodes in sensors suffer from deteriorated sensitivity due to small pixel sizes, and organic light absorbing materials exhibit unpredictable characteristics, making it difficult to control sensor properties effectively.
Innovation Solution
A compound represented by Chemical Formula 1, with specific structural and energetic properties, is used in a sensor structure including electrodes, a photoelectric conversion layer, and a buffer layer, enhancing electrical properties and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel size is reduced to increase resolution, then measurement precision is improved, but sensitivity deteriorates due to smaller absorption area
Solution Approach 1:
The patent changes the material parameter from silicon to organic light-absorbing material, which fundamentally alters the absorption characteristics. This material substitution enables high sensitivity even in small pixel sizes by modifying the intrinsic optical properties at the molecular level, resolving the contradiction between small pixel size and sufficient light absorption
Solution Approach 2:
The patent employs composite material structures combining organic light-absorbing materials with specific host matrices or dopants. This composite approach enhances the light absorption efficiency and charge carrier generation in the organic material, compensating for the reduced absorption area in small pixels while maintaining resolution
2Reliability
If organic light absorbing material is used to replace silicon, then sensitivity can be improved, but characteristics become unpredictable and difficult to control
Solution Approach 1:
The patent systematically adjusts key parameters including HOMO-LUMO energy levels, molecular weight, glass transition temperature, and substituent groups to achieve predictable and controllable characteristics. By establishing specific parameter ranges and relationships, the patent transforms organic materials from unpredictable to precisely controllable for sensor applications
Solution Approach 2:
The patent introduces specific functional groups and molecular structures at localized positions within the organic material to achieve desired electrical and optical properties. By controlling local molecular architecture and composition, the patent enables precise tuning of bulk material characteristics for reliable sensor performance
3Reliability
If compound structure is optimized for electrical properties, then sensor performance is improved, but heat resistance may deteriorate
Solution Approach 1:
The patent designs composite molecular structures combining electron-donating and electron-withdrawing groups in specific configurations. This composite molecular architecture achieves optimal electrical properties for charge carrier generation and transport while the rigid core structures and crosslinking provide thermal stability, resolving the contradiction between electrical performance and heat resistance
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 sensor performance by maintaining high heat resistance and precise control over electrical characteristics, enabling effective light conversion into electrical signals.
Implementation Method 1
A photoelectric conversion device is a device that receives light and converts the light into an electrical signal
Data Source
AI summary
A compound that may be applied to a sensor to improve electrical properties thereof is represented by Chemical Formula 1:In Chemical Formula 1, each substituent is the same as defined in the detailed description.