Electronic-Microfluidic Device with Opposite-Side Interface Separation
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Solution Overview
Problem
Integrated electronic-microfluidic devices face challenges in isolating chemical and electrical interfaces effectively, leading to potential malfunction or destruction due to the proximity of wet-chemical and electrical interfaces.
Innovation Solution
The device features a semiconductor substrate with electronic and microfluidic structures on opposite sides, utilizing a signal interface structure and microfluidic structure configuration that confines fluid flow to one side, ensuring clear separation between electrical and chemical interfaces, and incorporates thermal isolation trenches and materials like silicon dioxide for thermal insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wet-chemical interfaces and electrical interfaces are placed in close proximity to achieve integration, then device functionality is improved, but the risk of chemical exposure to electrical contacts increases leading to malfunction or destruction
Solution Approach 1:
The device is divided into distinct functional zones: a first substrate containing electrical interfaces and a second substrate containing microfluidic channels. This segmentation physically separates wet-chemical interfaces from electrical interfaces, preventing chemical exposure to electrical contacts while maintaining integrated device functionality through controlled interfaces between substrates.
Solution Approach 2:
The patent transitions from planar integration to three-dimensional stacked architecture. Electrical interfaces are positioned on the first substrate while microfluidic channels are positioned on the second substrate above it, utilizing the vertical dimension to achieve spatial separation. This dimensional transition allows both interface types to coexist without interference, resolving the contradiction between integration and protection.
2Device complexity
If electrical and microfluidic components are integrated on the same substrate, then device complexity is reduced, but isolation between chemical and electrical interfaces becomes difficult achieving
Solution Approach 1:
The integrated device is segmented into two functional substrates: the first substrate hosts electrical components (electrodes, circuitry) while the second substrate contains microfluidic channels. This segmentation maintains structural integration (reduced complexity) while achieving chemical-isolation (preventing harmful exposure) through vertical stacking and selective interface design.
Solution Approach 2:
An intermediate layer or interface structure is introduced between the electrical substrate and microfluidic substrate. This intermediary enables functional integration (signal transmission, electrical stimulation of fluids) while maintaining chemical isolation (preventing direct contact between chemicals and electrical contacts), thus resolving the contradiction between integration and protection.
3Reliability
If thermal isolation measures are implemented to protect electrical components from heat, then thermal protection is improved, but device manufacturing complexity increases
Solution Approach 1:
Thermal isolation is achieved through segmentation into thermally distinct zones: the first substrate containing electrical components is thermally isolated from the second substrate containing microfluidic channels. This segmentation provides passive thermal protection to electrical components while maintaining manufacturing feasibility through standard multi-layer fabrication techniques and material selection.
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
This configuration enhances the separation between chemical and electrical interfaces, preventing damage from chemicals and allowing for effective thermal isolation, thus improving the reliability and functionality of the device.
Implementation Method 1
a microfluidic structure in the semiconductor substrate, which is configured to confine the fluid and to allow a flow of a fluid to and from the microfluidic structure only on a second semiconductor-substrate side
Implementation Method 2
a signal interface structure, which is arranged on a first semiconductor substrate side facing the first support and which is connected with the electronic circuit and configured to exchange incoming and outgoing signals with the electronic circuit and with an external communication channel
Implementation Method 3
incorporates thermal isolation trenches and materials like silicon dioxide for thermal insulation
Data Source
AI summary
An integrated electronic-micro fluidic device an integrated electronic-micro fluidic device, comprising a semiconductor substrate on a first support, an electronic circuit on a first semiconductor-substrate side of the semiconductor substrate, and a signal interface structure to an external device. A micro fluidic structure is formed in the semiconductor substrate, and is configured to confine a fluid and to allow a flow of the fluid to and from the microfluidic structure only on a second semiconductor-substrate side that is opposite to the first semiconductor-substrate side and faces away from the first support.