Wearable Photodetector Array With Hybrid UV-Sensitive Active Layer
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Solution Overview
Problem
Existing photodetectors have limited mechanical flexibility, weak absorption over a broadband spectrum, and reduced sensitivity to detect weak light signals, particularly UV light, which hampers their application in wearable devices for monitoring environmental light exposure and mitigating skin diseases.
Innovation Solution
Development of flexible and stretchable photodetectors using hybrid active materials with organic polymeric photoactive materials doped with UV-absorbing inorganic nanoparticles, quantum dots, and organic dyes, integrated with a 3D printing process to enhance UV response and sensitivity, and a photodetector module with an array of photodetectors for real-time monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photodetectors are used, then device structure is simple, but mechanical flexibility is limited and UV sensitivity is weak
Solution Approach 1:
The patent employs composite materials by integrating organic polymeric photoactive materials with inorganic nanoparticles (such as zinc oxide or titanium dioxide) to create a hybrid active layer. This composite structure combines the mechanical flexibility and processability of organic materials with the high UV absorption capability of inorganic nanoparticles, thereby resolving the contradiction between flexibility and UV sensitivity.
Solution Approach 2:
The patent applies local quality by incorporating charge carrier trap materials specifically within the active layer to enhance UV photon detection. These trap materials are strategically positioned to capture charge carriers generated by UV absorption, locally amplifying the photocurrent signal without compromising the overall mechanical flexibility of the device.
2Illumination intensity
If broadband absorption is enhanced, then spectral coverage increases, but sensitivity to weak light signals decreases
Solution Approach 1:
The patent applies local quality by incorporating charge carrier trap materials specifically within the active layer to enhance UV photon detection. These trap materials are strategically positioned to capture charge carriers generated by UV absorption, locally amplifying the photocurrent signal without compromising the overall spectral coverage.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the energy levels and distribution of charge carrier traps within the active layer. By optimizing the trap depth and concentration, the device achieves enhanced sensitivity to weak UV signals while maintaining broadband absorption capability across the visible spectrum.
3Measurement precision
If photodetector array is implemented, then monitoring precision improves, but device complexity increases
Solution Approach 1:
The patent implements segmentation by dividing the photodetector into multiple independent detection elements arranged in an array, each potentially optimized for specific wavelength ranges. This segmentation enables precise spectral decomposition and simultaneous multi-wavelength monitoring, achieving high measurement precision while maintaining modular device architecture.
Solution Approach 2:
The patent applies universality by designing a modular photodetector array where each element uses the same hybrid organic-inorganic active layer technology. This universal approach allows the system to perform multiple functions (broadband detection, UV-enhanced detection, spectral analysis) through a standardized platform, reducing overall device complexity despite the increased number of detection elements.
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 photodetectors provide precise and consistent irradiance measurements across relevant spectral bands, enabling effective monitoring and treatment of photosensitive skin diseases by amplifying photocurrent using charge tunneling injection and the photomultiplication effect, with high external quantum efficiency and reduced power consumption.
Implementation Method 1
the photodetectors include a hybrid active material system including organic polymeric photoactive materials doped with a charge carrier trap material such as, for example, UV-absorbing inorganic nanoparticles
Implementation Method 2
amplifying photocurrent using charge tunneling injection and the photomultiplication effect
Data Source
AI summary
A skin-wearable photodetector module includes an array with a plurality of photodetectors and a plurality of optical filters, and each photodetector is configured to receive an optical input from an optical filter having a central wavelength in a wavelength range of about 100 nm to about 1000 nm. Each photodetector includes a substrate with a first major surface having an electrode thereon, and a second major surface overlying an optical filter, an anode within an interior region of the electrode, an active layer including a. ternary mixture of an electron donor, an electron acceptor, and at least one charge carrier trap material, and a cathode that contacts the active layer.