Open-junction ionic transistor for biocompatible signal amplification
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Solution Overview
Problem
Conventional electronic devices based on metals and semiconductors are low in biocompatibility and incompatible with the ion-based signal transmission systems of the human body, leading to system inconsistency and inefficiency in signal exchange.
Innovation Solution
An open-junction ionic transistor is developed, comprising a substrate with p-type and n-type polyelectrolyte gels and reservoirs, where an ion input is injected through an injection unit, and a reverse bias voltage is applied to amplify the ionic current peak, enabling effective signal amplification and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electronic devices based on metals and semiconductors are used, then device functionality is achieved, but biocompatibility is low and system inconsistency occurs with biological ion-based systems
Solution Approach 1:
The patent changes the fundamental operating parameter from electron-based to ion-based conduction. The polyelectrolyte gel transistor uses mobile ions (cations and anions) as charge carriers instead of electrons, enabling direct compatibility with biological ion-based signal systems while maintaining device functionality
Solution Approach 2:
The invention employs composite material structures including polyelectrolyte gels combined with metal electrodes and encapsulation layers. The polyelectrolyte gel itself is a composite of polymer chains with ionic groups, creating a material that bridges organic biology and inorganic electronics
2Productivity
If reverse bias voltage is applied to amplify ion input, then ionic current peak is generated, but device complexity increases
Solution Approach 1:
The polyelectrolyte gel transistor structure inherently provides the amplification function through its pn junction properties. When reverse bias is applied, the depletion region formation and subsequent ion injection automatically generate the ionic current peak without requiring additional active control mechanisms, allowing the device to amplify signals through its intrinsic properties
3Reliability
If polyelectrolyte gel structure is used for ion conduction, then biocompatibility is improved, but manufacturing precision becomes more difficult
Solution Approach 1:
The device is segmented into distinct functional regions: p-type polyelectrolyte gel region, n-type polyelectrolyte gel region, depletion region, and reservoir regions. This segmentation allows each region to be optimized and controlled independently during manufacturing, simplifying the overall process despite the complexity of gel formation
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 open-junction ionic transistor successfully amplifies ion inputs, generating an ionic current peak, which enhances signal transmission and processing, overcoming the limitations of conventional devices by directly interacting with biological ion-based systems.
Implementation Method 1
a depletion region by reverse bias voltage is formed in the p type gel and the n type gel
Implementation Method 2
the ion input injected through the injection unit is amplified and ionic current peak is generated
Data Source
AI summary
Disclosed is an open-junction ionic transistor which includes: a substrate; a p type gel which is formed as a polyelectrolyte gel on the substrate; an n type gel which is formed as the polyelectrolyte gel on the substrate and having one side contacting one side of the p type gel; a first reservoir contacting the other side of the p type gel; a second reservoir contacting the other side of the n type gel; and an encapsulation layer covering the p type gel, the n type gel, the first reservoir, and the second reservoir, in which on the encapsulation layer, an injection unit for injecting an ion input is formed at a location corresponding to an interface contacting the p type gel and the n type gel and when reverse bias voltage is applied between the p type gel and the n type gel, the ion input injected through the injection unit is amplified and ionic current peak is generated.