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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Related Experiment Video

Updated: Mar 23, 2026

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Strain Engineering for Transition Metal Dichalcogenides Based Field Effect Transistors.

Tingting Shen1,2, Ashish V Penumatcha3,2, Joerg Appenzeller3,2

  • 1Department of Physics and Astronomy, Purdue University , West Lafayette, Indiana 47907, United States.

ACS Nano
|April 5, 2016
PubMed
Summary

Strain engineering in transition metal dichalcogenides (TMDs) using field-effect transistors (FETs) significantly tunes their band gap. This study shows a 100 meV band gap reduction in WSe2 under uniaxial tensile strain.

Keywords:
Schottky barrier modelTFETWSe2flexible substrateuniaxial tensile strain

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Transition metal dichalcogenides (TMDs) are promising 2D materials with tunable electronic properties.
  • Field-effect transistors (FETs) are crucial for probing material characteristics.
  • Strain engineering offers a pathway to modify material band gaps.

Purpose of the Study:

  • To demonstrate and quantify strain-induced band gap tunability in TMDs using FET electrical characteristics.
  • To investigate the mechanism of band gap change under uniaxial tensile strain.
  • To compare experimental findings with theoretical predictions.

Main Methods:

  • Fabrication of multilayer TMD FETs on flexible substrates.
  • Application of uniaxial tensile strain using a cantilever sample holder.
  • Analysis of device transfer characteristics and Schottky barrier (SB) simulations.
  • Comparison with Density Functional Theory (DFT) calculations.

Main Results:

  • Substantial band gap reduction of 100 meV observed in WSe2 under 1.35% uniaxial tensile strain at room temperature.
  • Strain-induced band gap change primarily affects the conduction band edge, reducing the electron Schottky barrier.
  • No significant change in hole injection into the valence band was observed.
  • Experimental results show excellent agreement with DFT calculations.

Conclusions:

  • Electrical measurements of TMD FETs provide a reliable method for observing strain-induced band gap tuning.
  • The non-uniform band gap shrinkage and its impact on Schottky barriers are experimentally verified.
  • Strain engineering is a viable technique for tailoring the electronic properties of 2D materials like WSe2.