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Updated: Feb 26, 2026

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
Published on: August 28, 2018
Tunable SnSe2 /WSe2 Heterostructure Tunneling Field Effect Transistor
Xiao Yan1, Chunsen Liu1, Chao Li1
1State Key Laboratory of ASIC and System, School of Microelectronics, Fudan University, Shanghai, 200433, China.
This study introduces SnSe2/WSe2 2D heterostructures for tunneling field-effect transistors. These devices exhibit tunable band alignment, enabling rectifier diode or transistor operation with high performance for low-power electronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- 2D semiconductors offer excellent electrostatic control for advanced transistors.
- Tunneling field-effect transistors (TFETs) avoid doping-induced band edge degradation.
- Van der Waals heterostructures enable novel electronic functionalities.
Purpose of the Study:
- To investigate SnSe2/WSe2 van der Waals heterostructures for TFET applications.
- To explore the tunability of band alignment via gate voltage.
- To characterize the device performance, including rectification and switching behavior.
Main Methods:
- Fabrication of SnSe2/WSe2 heterostructures.
- Electrical characterization under varying back-gate voltages.
- Analysis of band alignment, rectification ratio, subthreshold swing, and ON/OFF ratio.
Main Results:
- Tunable type-II to type-III band alignment achieved with gate voltage.
- Device operated as a rectifier diode (rectification ratio ~104) or n-type TFET.
- Steep subthreshold swing (minimum 37 mV dec-1) and high ON/OFF ratio (>106).
- Negative differential resistance observed in the TFET mode.
Conclusions:
- SnSe2/WSe2 heterostructures demonstrate promising characteristics for TFETs.
- Tunable band alignment offers versatile device operation.
- High performance metrics suggest potential for low-power consumption devices.
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