Internal-Ion Gated Electrochemical Transistors for Biological Signal Processing
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Solution Overview
Problem
Existing electronic systems for interacting with biological substrates lack effective transistors that can efficiently perform signal amplification, filtering, and electrical or chemical stimulation due to deficiencies in existing transistor designs.
Innovation Solution
The development of internal-ion gated electrochemical transistors, which include a conducting polymer channel acting as a reservoir for positively charged mobile ions, an ion membrane between the channel and gate electrode, and electrodes for controlling ion bonding and conductivity, allowing for high transconductance and scalable integrated circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transistor designs are used for biological interactions, then device simplicity is maintained, but signal processing efficiency and biocompatibility are insufficient
Solution Approach 1:
The transistor channel is constructed from a composite material comprising a conducting polymer and a biocompatible solution, combining the electrical conductivity of the polymer with the biocompatibility of the solution to enable efficient signal processing in biological environments
Solution Approach 2:
An ion membrane is introduced as an intermediary layer between the gate electrode and the channel, mediating the interaction between electrical signals and ionic processes to improve signal processing efficiency while maintaining biocompatibility
2Power
If external ion gating is used, then device simplicity is maintained, but transconductance and switching speed are limited
Solution Approach 1:
The gating function is extracted from an external mechanism and integrated into the channel itself through mobile ions embedded in the conducting polymer matrix, eliminating the need for complex external ion reservoirs and enabling high transconductance
Solution Approach 2:
Mobile ions are nested within the conducting polymer channel structure, with the ions embedded in the polymer matrix to create an internal ion gate that provides rapid switching and high transconductance without external complexity
3Reliability
If conventional transistors are used for biological substrates, then manufacturing simplicity is maintained, but biocompatibility and therapeutic efficacy are insufficient
Solution Approach 1:
The channel material parameters are changed from conventional semiconductors to a composite of conducting polymer and biocompatible solution, fundamentally altering the material properties to achieve biocompatibility while maintaining manufacturability through solution processing
Solution Approach 2:
The biocompatible solution in the channel serves multiple functions simultaneously: providing ionic conductivity, ensuring biocompatibility with biological substrates, and enabling self-regulated ion transport, eliminating the need for separate biocompatibility layers
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
These transistors enable high-speed, high-transconductance operations and independent gating, facilitating efficient signal processing and interaction with biological substrates, such as recording electrophysiological activities with improved efficacy and tolerability.
Implementation Method 1
in an off state of the internal-ion gated electrochemical transistor, at least a subset of the positively charged mobile ions are ionically bonded to negatively charged ions of the conducting polymer
Implementation Method 2
an ion membrane between the channel and the gate electrode
Implementation Method 3
at least one of the off state and the on state of the internal-ion gated electrochemical transistor is actuated by application of a voltage to the gate electrode
Data Source
AI summary
An internal-ion gated electrochemical transistor is provided. In some embodiments, the internal-ion gated electrochemical transistor comprises: a gate electrode, a source electrode, and a drain electrode; a channel formed between the source electrode and the drain electrode, wherein the channel comprises a conducting polymer, wherein the channel serves as a reservoir of positively charged mobile ions; and an ion membrane between the channel and the gate electrode, wherein: in an off state, at least a subset of the positively charged mobile ions are ionically bonded to negatively charged ions of the conducting polymer, and wherein in an on state, at least a subset of the positively charged mobile ions are unbonded from the negatively charged ions of the conducting polymer to induce a current within the channel, and wherein at least one of the off state and the on state is actuated by application of a voltage to the gate electrode.