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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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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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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Gate-Tunable Semiconductor Heterojunctions from 2D/3D van der Waals Interfaces.

Jinshui Miao1, Xiwen Liu1, Kiyoung Jo1

  • 1Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.

Nano Letters
|March 21, 2020
PubMed
Summary
This summary is machine-generated.

Researchers created novel 2D/3D semiconductor heterojunctions using molybdenum disulfide (MoS2) on silicon (Si) and gallium nitride (GaN). These van der Waals (vdW) semiconductor devices show significant modulation in conductance and rectification ratios.

Keywords:
gallium nitridegate-tunableheterostructuresilicontransition metal dichalcogenidesvan der Waals

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Semiconductor Device Physics

Background:

  • Van der Waals (vdW) semiconductors offer advantages for scaled devices due to their 2D nature and self-passivated surfaces, enabling superior electrostatic control.
  • Existing field-effect devices utilize 2D vdW materials, but integrating them with 3D semiconductors presents new opportunities for enhanced performance.

Purpose of the Study:

  • To demonstrate novel 2D/3D semiconductor heterojunctions by combining 2D vdW materials with traditional 3D semiconductors.
  • To explore the performance metrics of these hybrid heterojunctions, particularly in terms of electrical modulation.
  • To investigate the impact of Fermi level tuning on device characteristics.

Main Methods:

  • Fabrication of heterojunctions using molybdenum disulfide (MoS2) as the 2D semiconductor and silicon (Si) and gallium nitride (GaN) as the 3D semiconductor layers.
  • Utilizing controlled substitutional doping schemes in 3D semiconductors and the passivated surfaces of 2D semiconductors.
  • Tuning the Fermi levels in MoS2 to modulate device properties.

Main Results:

  • Demonstration of 2D/3D semiconductor heterojunctions with MoS2 on Si and GaN.
  • Achieved over 7 orders of magnitude modulation in rectification ratios and conductance by tuning Fermi levels in MoS2.
  • Observed that interface quality may not critically impact Fermi level tuning at the junction.

Conclusions:

  • 2D/3D semiconductor heterojunctions offer a pathway to exceed the performance of all-2D vdW heterojunctions.
  • Fermi level tuning in MoS2 is a key mechanism for achieving significant device modulation.
  • The findings open possibilities for novel device architectures leveraging the unique properties of 2D/3D semiconductor interfaces.