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Phosphorene: Synthesis, Scale-Up, and Quantitative Optical Spectroscopy.

Adam H Woomer1, Tyler W Farnsworth1, Jun Hu1

  • 1Department of Chemistry, ‡Chapel Hill Analytical and Nanofabrication Laboratory, and §Department of Applied Physical Sciences, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States.

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|August 11, 2015
PubMed
Summary

Researchers achieved large-scale production of two-dimensional (2D) phosphorene using liquid exfoliation. This breakthrough enables detailed study of its unique optoelectronic properties, with band gaps tunable by thickness.

Keywords:
2D materialsband gapblack phosphorusliquid exfoliationoptical spectroscopyphosphorenequantum confinement

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Phosphorene, a 2D form of black phosphorus, has immense theoretical interest but faces experimental challenges in production.
  • Previous methods struggled with large-scale synthesis of monolayer, bilayer, and few-layer phosphorene flakes.

Purpose of the Study:

  • To develop a scalable method for producing high-quality 2D phosphorene.
  • To establish reliable techniques for characterizing phosphorene thickness and purity.
  • To quantify the optoelectronic properties, specifically the band gap, of 2D phosphorene as a function of layer number.

Main Methods:

  • Systematic survey of liquid exfoliation conditions for large-scale production (10 g scale).
  • Development of a rapid method for quantifying 2D phosphorene thickness.
  • Quantitative measurement of absorption edge and band gap using a novel analytical method for polydisperse samples.
  • Characterization of crystalline structure and oxidation state of produced flakes.

Main Results:

  • Successful large-scale production of monolayer, bilayer, and few-layer phosphorene.
  • Demonstration of crystalline and unoxidized flakes, with rapid oxidation upon air exposure.
  • Accurate determination of the absorption edge as a function of flake thickness.
  • Observed a significant increase in band gap with decreasing layer number, from 0.33 eV (bulk) to 1.88 eV (bilayer).
  • Quantified a higher-energy optical transition (VB-1 to CB) increasing from 2.0 eV (bulk) to 3.23 eV (bilayer).

Conclusions:

  • This work presents scalable production and analysis methods for 2D phosphorene.
  • The tunable band gap and unique optoelectronic properties of phosphorene position it as a promising material for future electronic and photonic devices.
  • The developed analytical methods are applicable to other quantum-confined semiconductor systems.