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Analysis and Optimisation of Periodic Interface Textures in Thin-Film Silicon Solar Cells
In thin-film silicon solar cells, textured interfaces are introduced to improve light trapping and boost the conversion efficiency. In this work, two-dimensional numerical analysis based on the finite element method is employed to determine the optimal periodic texturisation that can be fabricated on plastic or steel substrate foils. The texturisation is optimised for amorphous silicon (a-Si:H), microcrystalline silicon (μc-Si:H), and tandem micromorph (a-Si:H/μc-Si:H) solar cells. Different shapes of periodic features are analysed (rectangular, triangular, sine and Ulike), and their lateral and vertical parameters are varied in the optimisation. Simulation results show that optimised periodic textures introduce efficient scattering of long-wavelength light and a pronounced anti-reflective behaviour at shorter wavelengths. While smaller texture features (around 300 nm) are desired for a-Si:H cells, larger features (around 1000 nm) are beneficial for μc-Si:H and micromorph solar cells. Compared to solar cells deposited on flat substrates, up to 31.6 % (a-Si:H cell; absorber thickness 200 nm) and 36.0 % (i-μc-Si:H cell; absorber thickness 1.2 μm) higher photocurrent can be achieved through optimal substrate texturisation.
B. Lipovsek, M. Cvek, A. Campa, J. Krc, M. Topic
Light Trapping, Simulation, Thin Film Solar Cell, Periodic Surface-Texture
Thin Film Solar Cells
Subtopic: Amorphous and Microcrystalline Silicon Solar Cells
Event: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain
Session: 3AV.1.81
3120 - 3123
ISBN: 3-936338-26-4
Paper DOI: 10.4229/25thEUPVSEC2010-3AV.1.81
0,00 EUR
Document(s): paper