Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 79: Photovoltaics: General Aspects
HL 79.3: Vortrag
Donnerstag, 29. März 2012, 11:00–11:15, EW 201
Laser structuring of solar glasses for light management — •Stephan Krause1, Paul-Tiberiu Miclea1,2, Gerhard Seifert1,2, and Stefan Schweizer1,3 — 1Fraunhofer Center for Silicon Photovoltaics CSP, Walter-Hülse-Str. 1, 06120 Halle (Saale) — 2Institute of Physics, Martin Luther University of Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120 Halle (Saale) — 3Centre for Innovation Competence SiLi-nano®, Martin Luther University of Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Str. 3, 06120 Halle (Saale)
Glass is an important component in solar modules. Structuring of the glass surface offers a fundamental approach to increase solar module efficiency. Ultra-short laser pulses allow for a flexible and innovative micro-structuring of the glass surface for light management. The micro-structures analyzed for light management were 2D-grids 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. For 1030 nm fs-laser structuring, the forward scattering of the 2D-grid structures with a line spacing of 50 µm, 25 µm and 10 µm could be gradually increased to more than 20%, 40% and nearly 80%, respectively, for the spectral range from 400 to 1100 nm.