Ionic Liquid Electrochemical Transistor for Stable High-Current Operation
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Solution Overview
Problem
Electrochemical transistors based on organic semiconductors face issues with low current output due to low charge carrier mobility and concentration, leading to high gate voltages and long switching times in electrochromic displays, and organic semiconductors are prone to electrochemical degradation in common electrolytes.
Innovation Solution
The use of ionic liquids as electrolytes in electrochemical transistors (ECTs) addresses the degradation issue and provides higher charge carrier densities, allowing for higher current levels and reduced gate voltages, while maintaining stability and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If common electrolytes are used in electrochemical transistors with organic semiconductors, then the device structure is simple, but the organic semiconductor undergoes electrochemical degradation
Solution Approach 1:
The patent applies the inert environment principle by using ionic liquids as electrolytes, which create a chemically inert environment that prevents electrochemical degradation of organic semiconductors. The ionic liquid's unique properties (negligible vapor pressure, electrochemical stability) provide protection against harmful chemical reactions while maintaining device functionality.
Solution Approach 2:
The patent employs composite materials by combining ionic liquids with organic semiconductors to create a stable electrochemical transistor system. This composite approach leverages the electrochemical stability of ionic liquids and the semiconductor properties of organic materials, achieving both high current levels and long-term stability.
2Device complexity
If conventional electrolytes are used, then the device complexity is low, but the charge carrier density is insufficient leading to low current output
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional aqueous or organic electrolytes to ionic liquids, fundamentally changing the electrolyte's physical and chemical parameters. This change results in higher charge carrier densities, improved ionic conductivity, and consequently higher current output from the electrochemical transistor.
3Productivity
If high gate voltages are applied to overcome low charge carrier mobility, then the current level can be increased, but the risk of dielectric breakdown and device damage increases
Solution Approach 1:
The ionic liquid electrolyte creates an inert environment that protects the device from damage even when high gate voltages are applied. The electrochemical stability and wide voltage window of ionic liquids prevent harmful side reactions and dielectric breakdown, enabling safe operation at higher voltages to achieve required current levels.
4Use of energy by moving object
If the dielectric layer thickness is reduced to lower gate voltage, then the driving voltage decreases, but leakage currents increase and dielectric breakdown risk increases
Solution Approach 1:
The ionic liquid provides an inert environment that suppresses leakage currents and prevents dielectric breakdown, enabling the use of thinner dielectric layers. This allows the device to operate at lower gate voltages while maintaining reliability, as the ionic liquid's electrochemical stability protects against the increased risk associated with thin dielectrics.
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
Ionic liquid-based ECTs achieve significantly higher current levels at lower driving voltages, enhancing the operational efficiency and stability of electrochromic displays, with improved charge carrier densities and reduced risk of semiconductor degradation.
Implementation Method 1
an electrolyte, the electrolyte including an ionic liquid
Implementation Method 2
electrochemical transistor comprising an electrolyte
Data Source
AI summary
An electrochemical transistor comprising an electrolyte is disclosed. The electrolyte includes an ionic liquid. In a preferred embodiment, the transistor further comprises a source electrode, a drain electrode separated from the source electrode so as to form a gap between the source and drain electrodes, a semiconductor layer bridging the gap between the source and drain electrodes to form a transistor channel, and a gate electrode separated from the source electrode, the drain electrode and the semiconductor layer. In this embodiment, the electrolyte is disposed so as to contact at least a part of both the semiconductor layer and the gate electrode.