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Related Concept Videos

Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Matter: Pure Substances and Mixtures
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Related Experiment Video

Updated: Jan 22, 2026

Single-Digit Nanometer Electron-Beam Lithography with an Aberration-Corrected Scanning Transmission Electron Microscope
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Composition determination for quaternary III-V semiconductors by aberration-corrected STEM.

P Kükelhan1, T Hepp1, S Firoozabadi1

  • 1Materials Science Centre and Faculty of Physics, Philipps University Marburg, Hans-Meerwein-Straße 6, Marburg, Germany.

Ultramicroscopy
|July 17, 2019
PubMed
Summary

This study presents a new method for determining the composition of quaternary III-V semiconductors using scanning transmission electron microscopy (STEM) imaging. The technique accurately analyzes materials like (GaIn)(AsBi) quantum wells.

Keywords:
Composition determinationImage simulationQuantitative STEMQuaternary III-V semiconductors

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Quantitative scanning transmission electron microscopy (STEM) is crucial for nano-material characterization.
  • Determining the absolute composition of ternary III-V semiconductors using STEM-experiment comparison is established.
  • Quaternary III-V semiconductors pose challenges for precise composition analysis.

Purpose of the Study:

  • To develop and validate a method for determining the composition of quaternary III-V semiconductors from a single STEM image.
  • To apply this method to (GalliumIndium)(ArsenicBismuth) [(GaIn)(AsBi)] as a model system.
  • To assess the method's feasibility through simulations and experimental validation.

Main Methods:

  • Utilizing intensity data from a single STEM image.
  • Performing simulation studies to investigate the influence of detector angles and specimen thickness.
  • Applying the developed method to experimental STEM images of (GaIn)(AsBi) quantum wells.

Main Results:

  • A novel method for quaternary III-V semiconductor composition determination using STEM was demonstrated.
  • Simulation studies confirmed the method's feasibility and explored parameter influences.
  • Experimental application to (GaIn)(AsBi) yielded concentration results consistent with X-ray diffraction and photoluminescence.

Conclusions:

  • The presented STEM-based method enables accurate composition determination for quaternary III-V semiconductors.
  • This technique offers a valuable tool for the characterization of complex nano-materials.
  • The findings are supported by both simulated and experimentally obtained data.