3D optical simulation formalism OPTOS for textured silicon solar cells

Area of Science:

• Optics and Photonics
• Materials Science
• Renewable Energy

Background:

• Simulating light propagation in textured solar cells is crucial for efficiency.
• Existing methods may lack efficiency or accuracy for complex 3D textures.
• Non-coherent light propagation in thick, textured materials requires advanced modeling.

Purpose of the Study:

• Introduce the three-dimensional formulation of the OPTOS formalism.
• Simulate non-coherent light propagation and absorption in thick textured sheets.
• Analyze the absorptance of solar cells with various front and rear surface textures.

Main Methods:

• Developed a 3D matrix-based method (OPTOS) using angle discretization.
• Generated redistribution matrices for pyramidal textures, gratings, and Lambertian scatterers.
• Validated OPTOS simulations against optical measurements and ray tracing.

Main Results:

• OPTOS accurately simulates light absorption in silicon solar cells with diverse textures.
• Simulations align with experimental data and established methods.
• Achieved absorption near the Yablonovitch Limit for specific front/rear texture combinations.

Conclusions:

• The 3D OPTOS formalism provides an efficient and accurate simulation tool.
• Integrating rear diffractive gratings with pyramidal front textures boosts photocurrent.
• This approach enhances solar cell performance, achieving significant photocurrent density gains.