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Modulation Doping via a Two-Dimensional Atomic Crystalline Acceptor.

Yiping Wang1, Jesse Balgley2, Eli Gerber3

  • 1Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, United States.

Nano Letters
|November 9, 2020
PubMed
Summary
This summary is machine-generated.

We discovered that alpha-ruthenium trichloride (α-RuCl3) enables precise charge control in 2D materials. This breakthrough enhances conductivity and charge transfer for advanced nanoelectronic applications.

Keywords:
2D Atomic CrystalsChemical Vapor DepositionModulation DopingMolecular Beam EpitaxyQuantum OscillationsRamanRuCl3

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Advanced 2D nanoelectronics, plasmonics, and emergent phases necessitate precise local charge control.
  • Layered crystalline materials acting as acceptors or donors are crucial for achieving this control.

Purpose of the Study:

  • To investigate the potential of alpha-ruthenium trichloride (α-RuCl3) as a dopant for 2D materials.
  • To demonstrate the efficacy of α-RuCl3 in enabling modulation doping and charge transfer in various 2D systems.

Main Methods:

  • Raman spectroscopy, photovoltage measurements, and electrical conductance measurements.
  • Ab initio calculations to understand the electronic properties of α-RuCl3.
  • Fabrication and characterization of devices using graphene, WSe2, and EuS doped with α-RuCl3.

Main Results:

  • Established that the large work function and narrow bands of α-RuCl3 facilitate modulation doping.
  • Achieved short-ranged lateral doping (≤65 nm) with high homogeneity using a single layer of α-RuCl3.
  • Demonstrated record mobilities in monolayer graphene (4900 cm²/Vs) at high hole densities (3 × 10¹³ cm⁻²) and enhanced charge transfer to bilayer graphene (6 × 10¹³ cm⁻²).

Conclusions:

  • α-RuCl3 is an effective material for clean and local charge control in 2D systems.
  • The demonstrated doping method significantly improves the performance of graphene-based devices.
  • This work paves the way for novel applications in 2D nanoelectronics and emergent phase studies.