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Journal of Photonics for Energy

Laser textured substrates for light in-coupling in thin-film solar cells
Author(s): Kambulakwao Chakanga; Ortwin Siepmann; Oleg Sergeev; Stefan Geißendörfer; Karsten von Maydell; Carsten Agert
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Paper Abstract

In this work, we investigate the use of a picosecond (ps) laser used for monolithic connection to texture three commercially available and frequently used multicomponent glasses, Corning EAGLE XG®, Schott BOROFLOAT® 33 and Saint-Gobain SGG DIAMANT®. The results show that the ablated crater profile and degree of texturing are glass composition dependent. This might be attributed to the different laser-induced electron collision times and recombination rates, and thus the critical electron density evolution leading to ablation. The surface texture is altered from periodic to random with decreasing scribing speed. The transmission of the textured substrates gradually decreases, whereas the multireflection on the surface increases as a consequence of the topological and morphological changes. The angular resolved measurements illustrate that the textured glass substrates scatter the light toward greater angles, which is necessary to increase the effective optical path in the absorber layer. Simulation results show that textured glass increases the absorption in the absorber material and the slightly modified refractive index region around the crater does not counteract the light in-coupling effect. The results suggest that these substrates can be used in various photovoltaic technologies and show potential for the application of alternative front contacts, such as carbon nanotubes.

Paper Details

Date Published: 2 October 2014
PDF: 13 pages
J. Photon. Energy 4(1) 044598 doi: 10.1117/1.JPE.4.044598
Published in: Journal of Photonics for Energy Volume 4, Issue 1
Show Author Affiliations
Kambulakwao Chakanga, Next Energy (Germany)
Ortwin Siepmann, Next Energy (Germany)
Oleg Sergeev, Next Energy (Germany)
Stefan Geißendörfer, Next Energy (Germany)
Karsten von Maydell, Next Energy (Germany)
Carsten Agert, Next Energy (Germany)

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