Stretchable Optoelectronics via Thin-Film Encapsulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional inorganic light emitting diodes (LEDs) and photodetectors are restricted by their rigid, flat semiconductor wafers, limiting their applications, and there is a need for flexible and stretchable electronic devices that can interact with biological tissues without causing electrical short circuits or adverse leakage currents in biological environments.
Innovation Solution
Development of stretchable and flexible optical devices incorporating micro-scale inorganic semiconductor elements, integrated with sutures or substrates that include barrier layers and adhesive layers to prevent water exposure and control leakage currents, allowing interaction with biological tissues while maintaining device functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rigid semiconductor wafers are used in LEDs and photodetectors, then device manufacturing and performance are maintained, but flexibility and stretchability are lost
Solution Approach 1:
The patent replaces rigid semiconductor wafers with thin-film semiconductor layers deposited on flexible substrates. The semiconductor layer is formed by depositing material onto a flexible substrate, creating a thin-film device that can be bent or stretched without breaking the rigid wafer structure. This enables flexibility and stretchability while maintaining semiconductor functionality.
Solution Approach 2:
The patent creates a composite structure combining flexible substrates with semiconductor layers. The flexible substrate provides mechanical compliance while the semiconductor layer provides electronic functionality. This composite approach allows the device to be both flexible and functional, resolving the contradiction between adaptability and structural stability.
2Adaptability or versatility
If flexible substrates are used to enable stretchability, then adaptability to biological tissues is improved, but water penetration and electrical short circuits increase
Solution Approach 1:
The patent implements a multi-layer encapsulation structure where flexible substrates are nested within protective barrier layers. The flexible substrate containing the semiconductor layer is enclosed between first and second flexible substrates that provide waterproofing. This nested structure allows the device to be both flexible for tissue interaction and protected from water penetration.
Solution Approach 2:
The patent uses thin-film encapsulation layers deposited over the semiconductor structures to provide waterproofing while maintaining flexibility. These thin protective films prevent water penetration and electrical short circuits while allowing the overall device to remain flexible and stretchable for biological applications.
3Adaptability or versatility
If thin-film devices are deposited on flexible substrates, then flexibility is achieved, but device complexity and manufacturing challenges increase
Solution Approach 1:
The patent uses flexible substrates that serve multiple functions: providing mechanical flexibility, serving as a deposition surface for thin-film semiconductors, and acting as part of the encapsulation structure. This multi-functionality reduces overall device complexity by combining multiple roles into single components.
Data Source
AI summary
Described herein are flexible and stretchable LED arrays and methods utilizing flexible and stretchable LED arrays. Assembly of flexible LED arrays alongside flexible plasmonic crystals is useful for construction of fluid monitors, permitting sensitive detection of fluid refractive index and composition. Co-integration of flexible LED arrays with flexible photodetector arrays is useful for construction of flexible proximity sensors. Application of stretchable LED arrays onto flexible threads as light emitting sutures provides novel means for performing radiation therapy on wounds.