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Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Polycrystalline Silicon Thin-film Solar cells with Plasmonic-enhanced Light-trapping
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Diffractive light trapping in crystal-silicon films: experiment and electromagnetic modeling.

Dirk N Weiss1, Benjamin G Lee, Dustin A Richmond

  • 1Washington Technology Center and University of Washington, Department of Electrical Engineering, Seattle, Washington 98195, USA. dnweiss@uw.edu

Applied Optics
|October 22, 2011
PubMed
Summary

This study explores diffractive light trapping in thin crystal silicon films using experimental and theoretical methods. Enhanced light absorption was observed at various incidence angles, improving efficiency for solar cell applications.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Thin crystal silicon films are crucial for photovoltaic devices.
  • Efficient light trapping is essential to maximize solar cell performance.
  • Nanostructured surfaces can enhance light absorption in silicon.

Purpose of the Study:

  • To investigate diffractive light trapping in 1.5 μm thick crystal silicon films.
  • To analyze the effect of incidence angle on light trapping efficiency.
  • To correlate experimental results with theoretical modeling for accurate performance prediction.

Main Methods:

  • Fabrication of gratings on silicon films using nanoimprinting.
  • Experimental characterization via hemispherical reflection measurements.
  • Theoretical analysis using rigorous coupled-wave analysis (RCWA) modeling.

Main Results:

  • Experimental and RCWA model data showed excellent agreement without fitting parameters.
  • Light trapping efficiency was successfully extracted from the model.
  • Enhanced light absorption was observed for incidence angles up to 50° for both TE and TM polarizations.

Conclusions:

  • Diffractive light trapping effectively enhances light absorption in thin silicon films.
  • The developed model accurately predicts experimental light trapping behavior.
  • Optimizing incidence angles can significantly boost the performance of silicon-based photonic devices.