Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV24)
DOI: https://doi.org/10.29363/nanoge.hopv.2024.056
Publication date: 6th February 2024
Si-based multi-junction architectures are hindered by incomplete harvesting in the near-infrared spectral range when the Si bottom cell is flat, without the conventional macroscopic light trapping surface texture. This is the case for e.g. III-V/Si multijunction solar cells where the III-V layers are wafer-bonded on a flat Si bottom cell, and for some perovskite/silicon tandem designs where the perovskite layers are ideally grown on a flat Si surface.
Here we present a novel nanostructured Ag back contact design that creates strong light trapping in a Si bottom cell with a flat top surface. We design a diffractive silver back-reflector featuring a near-infrared light scattering matrix that optimizes trapping of multiply-scattered light into a range of diffraction angles. By integrating near-field and far-field simulations we minimize reflection and parasitic plasmonic absorption by engineering destructive interference in the patterned back contact.
We test the new design on flat single-junction Si TOPCon solar cells and find a strongly improved near-infrared external quantum efficiency using the nano-backpattern. We then fabricate nanopatterned metagratings on GaInP/GaInAsP//Si two-terminal triple-junction solar cells via substrate conformal imprint lithography and characterize them optically and electronically, demonstrating a certified record efficiency of 36,1% for Si-based multijunction solar cells. The results are relevant for several other tandem cell designs.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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