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Defect Engineering in Few-Layer Phosphorene.

Ankur Sharma1, Bo Wen1,2, Boqing Liu1

  • 1Research School of Engineering, College of Engineering and Computer Science, the Australian National University, Canberra, ACT, 2601, Australia.

Small (Weinheim an Der Bergstrasse, Germany)
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Summary
This summary is machine-generated.

Defect engineering in few-layer phosphorene creates localized excitons with enhanced photoluminescence (PL) for infrared optoelectronics. This technique improves quantum efficiency and stability, paving the way for new applications.

Keywords:
activation energydefect emissionsinfraredlocalized excitonsphosphorene

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Defect engineering in 2D materials like phosphorene is crucial for tailoring optoelectronic properties.
  • Substrate interactions can be leveraged to introduce controlled defects in phosphorene.

Purpose of the Study:

  • To investigate defect engineering in few-layer phosphorene using substrate trapping centers.
  • To characterize the photoluminescence properties of localized excitons in three-layer (3L) phosphorene.

Main Methods:

  • Fabrication of few-layer phosphorene with substrate trapping centers.
  • Temperature-dependent photoluminescence (PL) spectroscopy to analyze excitonic emissions.
  • Quantum efficiency measurements of localized and free excitons.

Main Results:

  • Observation of a strong photoluminescence (PL) emission peak from localized excitons at ~1430 nm in 3L phosphorene.
  • Determination of an activation energy of ~77 meV for localized excitons, indicating high thermal stability.
  • Localized exciton emission exhibits approximately three times higher quantum efficiency compared to free excitons.

Conclusions:

  • Defect engineering via substrate trapping centers effectively creates stable, highly emissive localized excitons in 3L phosphorene.
  • The enhanced quantum efficiency and stability of localized excitons open possibilities for advanced infrared optoelectronic devices.
  • This approach offers a promising pathway for developing novel phosphorene-based optoelectronic applications.