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Design and Optimisation of Thin-Film Silicon PV Modules with Surface-Textured Front Glass by Using a Combined Geometric Optics / Wave Optics Model
B. Lipovsek, J. Krc, M. Topic
Light Trapping, Thin Film Solar Cell, Modelling / Modeling, Texturisation, Texturization
Thin Film Solar Cells
Subtopic: Amorphous and Microcrystalline Silicon Solar Cells
Event: 27th European Photovoltaic Solar Energy Conference and Exhibition
Session: 3DV.1.62
2604 - 2607
ISBN: 3-936338-28-0
Paper DOI: 10.4229/27thEUPVSEC2012-3DV.1.62
0,00 EUR
Document(s): paper


Light management techniques are crucial for improving the conversion efficiency of thin-film silicon solar cells and PV modules. In this respect, light scattering at textured interfaces is important for increasing the photocurrent by prolonging the effective optical paths of the light passing through the device. In this paper, numerical simulations are employed to study the light-trapping potential of large micro-scale surface textures applied on top of the front protective glass sheets in thin-film a-Si:H PV modules. The simulations are based on the newly developed optical model which combines incoherent geometric optics analysis and fully-coherent wave optics analysis. Using the simulations, we investigate the potential of different surface-texture morphologies of the front glass (triangular, U-like, inverted U-like) with different dimensions of texture features (period and peak-to-peak height) in order to determine the optimal textures that result in maximal short-circuit current densities. Simulation results indicate that optimized front micro-scale surface textures of thin-film a-Si:H PV modules significantly improve light trapping within the underlying solar cell. Optimized U-like textures are especially advantageous, as they are able to assure consistently low reflectance from the PV module in both perpendicular as well as oblique illumination conditions.