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Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Van der Waals Equation01:10

Van der Waals Equation

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The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...
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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials

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Laser Writable Multifunctional van der Waals Heterostructures.

Bao-Wang Su1, Xi-Lin Zhang1, Bin-Wei Yao2

  • 1The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Teda Applied Physics Institute and School of Physics, Nankai University, Tianjin, 300071, China.

Small (Weinheim an Der Bergstrasse, Germany)
|November 24, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a laser direct write method to create multifunctional nanoelectronic devices from 2D materials like black phosphorus and molybdenum disulfide. This technique enables simultaneous fabrication of diodes and bipolar junction transistors, offering a versatile approach for integrated circuits.

Keywords:
2D heterostructure integrationbase widthbipolar junction transistorlaser write micro/nanoprocessingmultifunctional nanoelectronic devices

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Integrating 2D materials into multifunctional van der Waals nanoelectronic devices is crucial for advanced electronics.
  • Current fabrication methods often involve complex designs and manufacturing processes, hindering scalability.

Purpose of the Study:

  • To demonstrate a facile, fast, and versatile laser direct write micro/nanoprocessing technique.
  • To fabricate diode and NPN (PNP) bipolar junction transistor (BJT) simultaneously on a 2D heterostructure.
  • To explore the modulation of device performance via laser-written parameters.

Main Methods:

  • Utilized a pre-fabricated black phosphorus/molybdenum disulfide heterostructure.
  • Employed laser direct write micro/nanoprocessing for device fabrication.
  • Investigated the effect of tunable base width (WB) on device performance.

Main Results:

  • Successfully fabricated diodes with good rectification behavior.
  • Demonstrated simultaneous fabrication of NPN and PNP BJTs, with NPN exhibiting superior performance due to differing carrier concentrations.
  • Achieved efficient modulation of current gain by adjusting the laser-written base width, consistent with theoretical predictions.
  • Reported maximum gains of ≈41 for NPN and ≈12 for PNP at WB ≈600 nm.
  • Extended the technique to multifunctional WSe2 /MoS2 heterostructure devices.

Conclusions:

  • The laser direct write method offers a novel, cost-effective, and universal approach for fabricating multifunctional nanoelectronic devices.
  • This technique shows significant promise for the large-scale integration of 2D heterostructures in future electronic circuits.