Two Leiden University (The Netherlands) researchers have demonstrated that at a thickness of 4.5 nm, niobium nitride (NbN) is able to absorb nearly 100% of light. Previously, they say, the best light absorption was 50%. The material promises to enable "the ideal light detector"; a cell made from the material has already proven able to collect light and convert it to an electrical signal. The researchers' work, reported in Applied Physics Letters, was among the journal's top 20 most downloaded articles in May.
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