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Spatial resolution versus data acquisition efficiency in mapping an inhomogeneous system with species diffusion.

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Spatially-resolved photoluminescence (PL) imaging is faster but less accurate than scan mode when carrier diffusion is present. Scan mode offers superior spatial resolution for defect analysis in materials like GaAs.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Optoelectronics

Background:

  • Traditional spatially-resolved photoluminescence (PL) uses point-by-point scanning.
  • Imaging mode PL, utilizing detector arrays, offers improved measurement efficiency.
  • A key assumption of comparable spatial resolution between modes has been implicit.

Purpose of the Study:

  • To investigate the impact of carrier diffusion on spatial resolution in PL techniques.
  • To compare the spatial resolution of scan mode vs. imaging mode PL.
  • To develop a method for extracting intrinsic carrier diffusion length.

Main Methods:

  • Comparative analysis of scan mode and imaging mode spatially-resolved PL.
  • Application of both techniques to a Gallium Arsenide (GaAs) epilayer.
  • Development of a superposition principle for solving the diffusion equation.

Main Results:

  • Carrier diffusion significantly impacts spatial resolution, favoring scan mode.
  • Scan mode PL provides superior spatial resolution compared to imaging mode.
  • Isolated dislocations (singlet and doublet) were identified in the GaAs epilayer.

Conclusions:

  • The choice of PL mode critically affects spatial resolution when carrier diffusion is present.
  • The developed method allows extraction of intrinsic carrier diffusion length in systems with defects.
  • Findings are relevant for diverse fields studying species dynamics, including physics and biology.