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Mid-Infrared, Optically Active Black Phosphorus Thin Films on Centimeter Scale.

Naoki Higashitarumizu1,2, Tetsuya Kawashima3, Thomas Smart4

  • 1Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States.

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|March 13, 2024
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Summary

Researchers developed a scalable method to create high-quality black phosphorus (BP) thin films for mid-infrared optoelectronics. This technique uses high-pressure conversion of red phosphorus, enabling new applications in chip-scale devices.

Keywords:
black phosphorushigh-pressure synthesislarge-scalemid-infrared emission

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Black phosphorus (BP) is a semiconductor with a narrow bandgap (∼0.3 eV), ideal for mid-infrared optoelectronic applications.
  • Achieving high-quality, scalable BP thin films remains a significant challenge for device fabrication.

Purpose of the Study:

  • To develop a scalable synthesis method for optically active black phosphorus (BP) films.
  • To enable the fabrication of centimeter-scale BP films for integrated optoelectronic devices.

Main Methods:

  • Pulsed laser deposition of amorphous red phosphorus.
  • High-pressure (∼8 GPa) phase conversion to BP crystals.
  • Thermal annealing to improve crystalline quality.
  • Utilized a flat-belt-type high-pressure apparatus for centimeter-scale synthesis.

Main Results:

  • Successfully synthesized optically active BP films on a centimeter scale.
  • Achieved a continuous BP film with a thickness of approximately 18 nm.
  • Observed photoluminescence emission at mid-infrared wavelengths, indicating good crystalline quality.
  • Demonstrated the feasibility of high-pressure conversion for scalable BP film production.

Conclusions:

  • The presented synthesis procedure offers a promising route for obtaining optical-quality BP films.
  • This method facilitates the exploration of integrated optoelectronic devices, including mid-infrared light-emitting devices and cameras.
  • Enables chip-scale applications leveraging the unique properties of black phosphorus.