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focused with about 1000× concentration onto a solar cell with a size of only about 600 µm × 600 µm, i.e., very small areas. The work is embedded in the WSS project (https://www.ise.fraunhofer.de/de/presse
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cell has already achieved a record efficiency of 68.9%. (https://doi.org/10.1002/pssr.202100113) . The thin-film processing of such III-V devices is a crucial building block for maximum efficiency, as it
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