The Townes Laser Institute

Fraunhofer Townes Collaboration

Research Topics:

Reduction of shadowing effects in solar cells

Photovoltaic modules with crystalline silicon (c-Si) are the most commonly used technology today in the photovoltaic industry. As the metal deposited on the front blocks the solar radiation from reaching the silicon surface, the area covered by the metallization needs to be kept minimum in order to reduce shadowing energy losses. We investigate different laser-assisted approaches to minimize the portion of light impinging the metallization e.g. by introducing light-scattering microstructures into the cover glass of the photovoltaic modules. For this purpose femtosecond laser-written single/multilayer diffraction gratings can be generated in the glass bulk to effectively divert light away from the contacts.