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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given...
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Correlating Optical Microspectroscopy with 4×4 Transfer Matrix Modeling for Characterizing Birefringent Van der Waals

Julian Schwarz1, Michael Niebauer1, Maria Koleśnik-Gray2

  • 1Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Electron Devices, Cauerstraße 6, 91058, Erlangen, Germany.

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Summary

Accurately measuring the thickness of Van der Waals materials is crucial for their electronic applications. This study introduces a new optical reflectance method for precise, nondestructive thickness determination, even for encapsulated layers.

Keywords:
anisotropybirefringencemicrospectroscopythickness determinationtransfer matrix methodvan der Waals materials

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Van der Waals materials possess unique electronic and optoelectronic properties.
  • Precise thickness control is essential for optimizing device performance.
  • Existing thickness measurement techniques have limitations.

Purpose of the Study:

  • To develop a nondestructive and easily implementable method for accurate thickness determination of birefringent layered materials.
  • To provide a reliable technique for tailoring Van der Waals material properties for device applications.

Main Methods:

  • Combining optical reflectance measurements with a modular model.
  • Utilizing a 4x4 transfer matrix method and light microspectroscopy.
  • Demonstrating the approach on anisotropic materials like graphite and black phosphorus.

Main Results:

  • Achieved reliable and precise thickness determination from atomic layers up to >100 nm.
  • The method is effective even for encapsulated layers.
  • Outperformed state-of-the-art techniques like atomic force microscopy.

Conclusions:

  • The developed optical reflectance method offers a robust solution for thickness characterization of Van der Waals materials.
  • This technique facilitates the precise engineering of materials for advanced electronic and optoelectronic devices.