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A New Fitting Method for Ambipolar Diffusion Length Extraction in Thin Film Structures Using Photoluminescence

Cheng-Hao Chu1, Ming-Hua Mao2,3,4, You-Ru Lin5

  • 1Graduate Institute of Electronics Engineering, National Taiwan University, No. 1, Roosevelt Rd. Sec. 4, Taipei, 10617, Taiwan.

Scientific Reports
|April 7, 2020
PubMed
Summary

A new scanning photoluminescence microscopy method simplifies extracting ambipolar diffusion length in 2D electronic transport thin films. This technique offers a straightforward way to analyze semiconductor carrier transport properties.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Semiconductor Physics

Background:

  • Accurate characterization of carrier transport properties is crucial for developing advanced 2D electronic devices.
  • Traditional methods for determining ambipolar diffusion length can be complex and require specialized equipment.
  • Understanding carrier dynamics in thin film structures is essential for optimizing device performance.

Purpose of the Study:

  • To introduce a simplified method for extracting ambipolar diffusion length in 2D electronic transport using scanning photoluminescence microscopy (SPLM).
  • To demonstrate the efficacy of the proposed method through numerical simulations and experimental application on a GaAs thin film.
  • To provide a facile technique for evaluating carrier transport properties in thin films and quantum wells.

Main Methods:

  • Utilizing a scanning photoluminescence microscopy (SPLM) setup without the need for spatially-resolved photoluminescence detection.
  • Measuring excitation-position-dependent photoluminescence (PL) intensity profiles across the edge of a semiconductor sample.
  • Applying a simple analytic fitting function to the SPLM profile to extract the ambipolar diffusion length.
  • Validating the fitting method with numerical simulations and confirming with time-resolved photoluminescence measurements for carrier lifetime determination.

Main Results:

  • A novel, simple analytic fitting method was developed and verified for extracting ambipolar diffusion length from SPLM data.
  • The method was successfully applied to a GaAs thin film, yielding the ambipolar diffusion length.
  • Simultaneous determination of the ambipolar diffusion coefficient was achieved by combining SPLM with time-resolved photoluminescence measurements.
  • The proposed technique eliminates the requirement for complex spatially-resolved photoluminescence detection.

Conclusions:

  • The developed SPLM-based method offers a significantly simplified approach to determine ambipolar diffusion length in 2D electronic transport systems.
  • This technique is broadly applicable to various thin film structures and quantum wells, facilitating the characterization of semiconductor carrier transport.
  • The method provides a valuable tool for researchers and engineers working on next-generation electronic devices and materials.