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Ultra-broadband Antireflection Coatings (ARCs) are essential to realizing the potential efficiency gains of four-junction photovoltaic devices that absorb to longer wavelengths than state-of-the-art three-junction cells. In this work, we examine a novel design that integrates a nanostructured antireflection layer with a multilayer ARC. Using optical models, we find that this hybrid approach can reduce...
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