Organic Photodetector for Non-Invasive Biometric Sensing
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Solution Overview
Problem
Conventional inorganic photodetectors suffer from light loss and low photoelectric conversion efficiency, making them inadequate for non-invasive biometric monitoring, particularly in distinguishing minute biomedical differences and providing flexible, portable solutions.
Innovation Solution
A non-invasive biometric sensor utilizing a flexible organic photodetector with an organic photoelectric conversion layer, capable of selectively receiving near-infrared light without a color filter, allowing for high photoelectric conversion efficiency and flexible, bendable design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional inorganic photodetectors are used, then the sensor structure is well-established, but light loss occurs and photoelectric conversion efficiency is low
Solution Approach 1:
The patent changes the material parameter from inorganic to organic photodetector, which fundamentally alters the photoelectric conversion mechanism. The organic photodetector achieves higher photoelectric conversion efficiency and reduces light loss by utilizing organic materials with tailored optical properties that better match the LED emission spectrum, particularly in the red and near-infrared regions.
Solution Approach 2:
The sensor employs a composite structure combining LED light source with organic photodetector materials. This composite approach integrates the advantages of LED (low power consumption, long lifetime) with organic photodetector (high photoelectric conversion efficiency, flexibility), creating a synergistic system that overcomes the limitations of conventional inorganic photodetectors.
2Adaptability or versatility
If conventional inorganic photodetectors are used, then manufacturing processes are mature, but the sensor lacks flexibility and portability
Solution Approach 1:
The patent implements flexible thin-film organic photodetector layers that can be bent and conform to different surfaces. The organic photodetector structure uses thin organic material layers deposited on flexible substrates, enabling the sensor to be integrated into wearable devices and portable applications while maintaining manufacturing feasibility through established thin-film deposition techniques.
3Reliability
If the organic photodetector thickness is increased to improve light absorption, then photoelectric conversion efficiency increases, but the device becomes less flexible and more complex
Solution Approach 1:
The patent optimizes the organic photodetector thickness to achieve sufficient light absorption without excessive thickness. By carefully controlling the thickness parameter of the organic photoactive layer, the sensor achieves high photoelectric conversion efficiency while maintaining flexibility and simple device structure. The local optimization of thickness ensures adequate photon absorption in the critical wavelength ranges without the drawbacks of overly thick structures.
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 organic photodetector reduces light loss and enhances measurement accuracy for biomedical information like blood glucose concentration, heartbeat rate, and vein images, offering improved portability and versatility compared to conventional inorganic photodetectors.
Implementation Method 1
The organic photodetector may be configured to sense light in the desired (and/or alternatively predetermined) wavelength range in response to the light in the desired (and/or alternatively predetermined) wavelength range being transmitted through the body part
Implementation Method 2
The organic photoelectric conversion layer may be configured to selectively receive light in the desired wavelength range
Data Source
AI summary
Disclosed is a non-invasive biometric sensor including a light source, an organic photodetector, and a detector. The light source is configured to irradiate light in a desired (and/or alternatively predetermined) wavelength range to a body part. The organic photodetector is configured to sense the light in the desired (and/or alternatively predetermined) wavelength range in response to the light in the desired (and/or alternatively predetermined) range being transmitted through the body part. The detector is configured to determine biomedical information of the body part based on an amount of the light sensed by the organic photodetector.