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Marius Peters1, Marc Rüdiger, Benedikt Bläsi

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A new simulation method accurately models wave optics in silicon solar cells. This approach enhances solar cell efficiency by over 1 mA/cm² using diffractive gratings.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Optical Engineering

Background:

  • Crystalline silicon solar cells (100 µm thickness) are typically simulated using ray-tracing.
  • Emerging diffractive elements necessitate advanced wave optical simulations.
  • Existing methods may not fully capture complex optical effects.

Purpose of the Study:

  • To develop and validate a simulation method for 2D and 3D wave optical effects in silicon solar cells.
  • To quantify the accuracy of traditional electro-optical methods.
  • To assess the performance enhancement of solar cells with diffractive gratings.

Main Methods:

  • Coupling rigorous wave optical simulation with semiconductor device simulation.
  • Comparing simulation results with traditional electro-optical methods for error quantification.
  • Simulating a silicon solar cell featuring a back-side diffractive grating.

Main Results:

  • The developed method accurately simulates wave optical effects.
  • Errors associated with the electro-optical method were found to be less than 0.4% relative.
  • A back-side diffractive grating increased short-circuit current density (jSC) by over 1 mA/cm².

Conclusions:

  • The coupled simulation approach provides accurate wave optical modeling for silicon solar cells.
  • Traditional electro-optical methods exhibit minimal errors for standard configurations.
  • Diffractive gratings offer a viable strategy for enhancing solar cell performance.