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Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
636

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Copper sulfide nanochains achieve record photothermal conversion efficiency (PCE) by optimizing excited carrier dynamics. Ultrafast carrier-phonon scattering in these plasmonic nanomaterials enhances PCE for near-infrared applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Plasmonic nanomaterials are crucial for photothermal applications, particularly in the near-infrared II region.
  • Enhancing photothermal conversion efficiency (PCE) requires understanding excited carrier decay dynamics.
  • Copper sulfide (Cu2-xS) nanostructures offer potential for efficient photothermal conversion.

Purpose of the Study:

  • To investigate the photophysical mechanisms governing PCE in Cu2-xS nanochains and nanoparticles.
  • To correlate excited carrier decay dynamics with PCE in different Cu2-xS nanostructures.
  • To achieve high PCE in the near-infrared II region using Cu2-xS nanochains.

Main Methods:

  • Femtosecond transient absorption spectroscopy was employed to study excited carrier dynamics.
  • Cu2-xS nanochains (PAA-chains-8.9, PSS-chains-7.3) and nanoparticles (PSS-particles-8.2) were synthesized and characterized.
  • Photothermal conversion efficiency was measured for the different nanostructures.

Main Results:

  • PAA-chains-8.9 exhibited ultrafast carrier-phonon scattering (~0.33 ps), depleting >90% of excited carriers.
  • Nanochains demonstrated faster phonon-phonon scattering decay times compared to nanoparticles.
  • PSS-chains-7.3 showed higher PCE (88.0%) than PSS-particles-8.2 (82.1%).
  • PAA-chains-8.9 achieved a record PCE of 90.5%, the highest reported for plasmonic photothermal agents.

Conclusions:

  • Strong carrier-phonon scattering and rapid phonon-phonon scattering significantly boost PCE in plasmonic systems.
  • Cu2-xS nanochains offer superior photothermal performance compared to nanoparticles due to optimized carrier dynamics.
  • The findings provide insights into designing high-performance plasmonic photothermal agents.