Matrix formalism for light propagation and absorption in thick textured optical sheets

Area of Science:

• Optics
• Materials Science
• Computational Physics

Background:

• Accurate simulation of light propagation and absorption in textured optical sheets is crucial for device efficiency.
• Existing methods may struggle with complex, multi-scale textures on different sides of a sheet.

Purpose of the Study:

• Introduce a computationally efficient simulation formalism, Optical Properties of Textured Optical Sheets (OPTOS), for calculating optical properties.
• Enable accurate modeling of non-coherent light propagation and absorption in thick textured sheets, particularly solar cells.

Main Methods:

• Employ a matrix-based method representing angular power distribution as a vector.
• Utilize redistribution matrices to model light interaction with front and rear surface textures.
• Integrate ray- or wave-optical techniques based on texture feature size for matrix calculation.

Main Results:

• Demonstrated computationally efficient calculation of optical properties for textured sheets.
• Achieved very good agreement between simulated and experimental absorption data for silicon sheets.
• Successfully modeled complex structures with V-grooves and diffraction gratings on opposite sides.

Conclusions:

• The OPTOS formalism provides an accurate and versatile tool for simulating light absorption in textured optical sheets.
• The method is efficient, allowing for parameter variations like thickness with minimal computational effort.
• This approach is particularly valuable for optimizing solar cell designs with advanced surface texturing.