Organic Compound for Green Light Absorption in Biometric Sensors
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Solution Overview
Problem
Conventional silicon photodiodes used in biometric recognition sensors have limited sensitivity due to small absorption areas, necessitating the development of alternative materials that can enhance light absorption and quantum efficiency, particularly in the green wavelength region.
Innovation Solution
A compound represented by Chemical Formula 1, which selectively absorbs light in the green wavelength region, is integrated into a photoelectric device, forming a light absorption sensor and sensor-embedded display panel, improving external quantum efficiency and charge characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon photodiode is used in sensor, then device structure is well-established and manufacturing is feasible, but sensitivity deteriorates due to smaller absorption area from small pixels
Solution Approach 1:
The patent changes the material parameter from silicon to organic compound, which fundamentally alters the optical absorption characteristics. The organic compound achieves higher extinction coefficient and selective wavelength absorption, compensating for the limited pixel area and improving sensitivity in small-pixel configurations.
Solution Approach 2:
The patent employs composite material strategy by integrating organic light-absorbing compounds with existing photodiode structures. This combination leverages the well-established device architecture while introducing superior light absorption properties through the organic material layer, resolving the contradiction between established manufacturing and improved sensitivity.
2Reliability
If organic material is used to replace silicon photodiode, then light absorption and sensitivity improve, but material stability and device reliability may deteriorate
Solution Approach 1:
The patent applies local quality principle by selecting organic compounds with specific molecular structures optimized for green wavelength absorption. The compound features tailored HOMO-LUMO energy levels and extended conjugation systems that provide both high light absorption efficiency and enhanced environmental stability, addressing the reliability-stability contradiction through localized material optimization.
Solution Approach 2:
The patent adopts materials that can be processed through solution-based methods and deposited as thin films, replacing expensive and complex silicon fabrication. The organic compound enables low-cost, scalable manufacturing while maintaining sufficient operational stability for sensor applications, trading long-term material permanence for manufacturing feasibility and performance.
3Device complexity
If sensor is disposed under display panel, then integration is improved and design flexibility increases, but manufacturing complexity and process difficulty increase
Solution Approach 1:
The patent employs organic compounds that can be integrated into existing display manufacturing processes through solution deposition techniques. The material serves multiple functions: light absorption for sensing, compatibility with flexible substrates, and integration with display pixel structures. This multi-functionality enables sensor embedding without requiring entirely new manufacturing infrastructure, resolving the integration-manufacturing contradiction.
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 light absorption and quantum efficiency in the green wavelength range, enhancing the performance of photoelectric devices and light absorption sensors, particularly in biometric recognition systems.
Implementation Method 1
The photoelectric device used in the sensor as described above is a device that converts light into an electrical signal using the photoelectric effect
Data Source
AI summary
Provided a compound represented by Chemical Formula 1, and a photoelectric device, a light absorption sensor, and an electronic device including the same.In Chemical Formula 1, the definition of each substituent is as described in the specification.