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Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
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All two-dimensional, flexible, transparent, and thinnest thin film transistor
Saptarshi Das1, Richard Gulotty, Anirudha V Sumant
1Center for Nanoscale Material, Argonne National Laboratory, Argonne, Illinois 60439, United States.
Nano Letters
|April 24, 2014
Summary
Researchers developed transparent, flexible thin-film transistors (TFTs) using all 2D materials. These high-mobility TFTs exhibit ambipolar characteristics, paving the way for advanced electronic applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Thin-film transistors (TFTs) are crucial for electronic displays and circuits.
- Existing TFTs often face limitations in transparency, flexibility, mobility, and ambipolar characteristics.
- Developing novel materials and device architectures is essential for next-generation electronics.
Purpose of the Study:
- To fabricate and characterize novel, transparent, and flexible TFTs using entirely two-dimensional (2D) materials.
- To achieve high carrier mobility and ambipolar device behavior in these 2D TFTs.
- To assess the performance and stability of the developed TFTs under various conditions.
Main Methods:
- Fabrication of TFTs using monolayer graphene as electrodes, 3-4 atomic layers of hexagonal boron nitride (h-BN) as the gate dielectric, and bilayers of tungsten diselenide (WSe2) as the semiconducting channel.
- Characterization of device performance including field-effect carrier mobility, transparency, mechanical strain tolerance, and temperature stability.
- Electrical measurements to determine contact resistance, subthreshold slope, and current ON-OFF ratio.
Main Results:
- Achieved 10 atomic layer thick TFTs with high field-effect carrier mobility of 45 cm(2)/(V s), approximately 100 times higher than amorphous silicon TFTs.
- Demonstrated ambipolar device characteristics, indicating the presence of both electron and hole conduction.
- The WSe2-hBN-graphene device stack exhibited over 88% transparency in the visible spectrum and maintained performance under 2% in-plane mechanical strain.
- Remarkable temperature stability was observed across a range of 77-400 K.
- Reported low contact resistance (1.4 kΩ-μm), a subthreshold slope of 90 mV/decade, and a high current ON-OFF ratio of 10(7).
Conclusions:
- Successfully fabricated the first all-2D transparent TFT on a flexible substrate with record-high mobility and current ON-OFF ratio.
- The developed 2D TFTs possess desirable characteristics such as transparency, flexibility, ambipolarity, and excellent stability, outperforming many existing TFT technologies.
- These findings represent a significant advancement in the field of 2D materials for flexible and transparent electronics.
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