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Ultrathin resonant-cavity-enhanced solar cells based on less than 30 nm thick hydrogenated amorphous germanium (a-Ge:H) absorbers have the potential to replace standard micrometer-thick microcrystalline silicon absorbers in silicon thin-film solar cell technology, as they yield comparable infrared absorption. Combined with the concept of a folded solar cell on a three-dimensional structured ZnO honeycomb...