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Gate-Tunable Tunneling Transistor Based on a Thin Black Phosphorus-SnSe2 Heterostructure
Junhong Na1,2, Youngwook Kim1, Jurgen H Smet1
1Max Planck Institute for Solid State Research , Heisenbergstrasse 1 , D-70569 Stuttgart , Germany.
ACS Applied Materials & Interfaces
|May 31, 2019
Summary
This study introduces a new tunneling field-effect transistor (TFET) using black phosphorus-tin diselenide (BP-SnSe2) heterostructures. These devices exhibit tunable Esaki diode and backward diode behaviors for low-power electronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Tunneling field-effect transistors (TFETs) are crucial for low-power electronic applications.
- Developing novel heterostructures is key to enhancing TFET performance and functionality.
Purpose of the Study:
- To demonstrate a new TFET based on a black phosphorus-tin diselenide (BP-SnSe2) heterostructure.
- To investigate the tunable Esaki diode and backward diode characteristics of this novel device.
Main Methods:
- Fabrication of a BP-SnSe2 heterostructure device.
- Electrical characterization under varying gate voltages and temperatures.
- Scanning photocurrent microscopy to analyze band alignment.
Main Results:
- The BP-SnSe2 heterostructure TFET exhibits tunable negative differential resistance (NDR) as an Esaki diode and backward rectification as a backward diode.
- Scanning photocurrent microscopy reveals a staggered (type II) band alignment at the heterojunction.
- Device behavior is consistent with thermionic emission theory and influenced by series resistance and passivation layer effects.
Conclusions:
- The novel BP-SnSe2 heterostructure offers a promising platform for tunable diode functionalities in TFETs.
- Understanding band alignment and charge trapping is critical for optimizing device performance.
- This work paves the way for advanced low-power electronic devices.
Keywords:
2D van der Waals heterostructureblack phosphorusnegative differential resistancetin diselenidetunneling transistorMore Related Videos
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