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Laser Structuring of Solar Glasses for Light Management
S. Krause, F. Steudel, P.-T. Miclea, S. Schweizer
Laser Processing, Light Trapping, Optical Properties
Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
Subtopic: New Materials, Cells and Modules
Event: 26th European Photovoltaic Solar Energy Conference and Exhibition
Session: 1DV.1.4
358 - 360
ISBN: 3-936338-27-2
Paper DOI: 10.4229/26thEUPVSEC2011-1DV.1.4
0,00 EUR
Document(s): paper


Glass is an important component in solar modules. Structuring of the glass surface offers a fundamental approach to increase solar module efficiency. Short and ultra-short laser pulses allow for a flexible and innovative nano-structuring of the glass surface for light management. The nano-structures analyzed for light management were 2D-grid structures consisting of many fine, parallel and equally spaced grooves. Transmission and scattering measurements showed that the untreated solar glass has an average transmittance of 85% in the spectral range from 400 nm to 1100 nm; the glass showed no significant light scattering (less than 1%). Laser structuring, however, leads to a significant increase in the forward scattering whereas the total transmittance remains almost unchanged. In the case of the 532 nm laser structuring, the forward scattering of the 2D-grid structure with a line spacing of 100 μm and 50 μm could be increased to more than 15% and 40%, respectively, for the spectral range from 400 to 1100 nm. The effect of the 1030 nm laser structuring was smaller for the 50 μm line spacing, but significantly higher for the 10 μm spacing: nearly 80% forward scattering was achieved for the 2D-grid structure.