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Adding Solvent into Ionic Liquid-Gated Transistor: The Anatomy of Enhanced Gating Performance
Wei Zhao1, Sheng Bi1, Cheng Zhang2
1State Key Laboratory of Coal Combustion, School of Energy and Power Engineering , Huazhong University of Science and Technology , Wuhan 430074 , China.
ACS Applied Materials & Interfaces
|March 16, 2019
Summary
Adding organic solvent to ionic liquids (ILs) significantly boosts the switching speed of molybdenum disulfide (MoS2) field-effect transistors (FETs) by enhancing ionic conductivity and MoS2 surface charge distribution.
Area of Science:
- Materials Science
- Nanotechnology
- Electronics
Background:
- Ionic liquid (IL)-gated field-effect transistors (FETs) leverage large interfacial capacitance for enhanced carrier density.
- Improving the switching speed of IL-gated FETs, a critical performance metric, remains underexplored.
- Molybdenum disulfide (MoS2) is a promising 2D semiconductor for advanced electronic applications.
Purpose of the Study:
- To investigate the dynamic and static gating performance of MoS2 FETs using IL/organic solvent mixtures.
- To determine the effect of varying ion concentrations on switching speed and semiconductor conductivity.
- To identify strategies for simultaneously enhancing both dynamic and static gating performance.
Main Methods:
- Utilized molecular dynamics simulations to model ion behavior at the liquid/solid interface.
- Employed resistance network analysis to evaluate transistor performance.
- Tested mixtures of 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) and acetonitrile (ACN) at various concentrations.
Main Results:
- Organic solvent addition accelerated IL response time by approximately 40 times at an optimal concentration of 1.94 M.
- Increased ionic conductivity of the IL, attributed to the organic solvent, was the primary factor for faster response.
- Homogenous surface charge distribution on MoS2 enhanced its conductivity by up to 2.4 times.
Conclusions:
- Optimal ion concentration for improved switching speed coincides with the concentration yielding maximum MoS2 conductivity.
- A strategy exists to simultaneously enhance dynamic (switching speed) and static (conductivity) gating performance.
- The developed modeling technique can screen for ideal ion concentrations in IL-gated FETs.
Keywords:
charging dynamicsionic liquid-gated transistormolybdenum disulfideorganic solventswitching speedMore Related Videos
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