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Nanomaterials Like semiconductors, small metallic clusters can absorb light and create excitons (electron-hole pairs). In ligand-capped gold clusters of 30 to 40 atoms (Au30 to Au40) that adopt the usual… Click to show full abstract
Nanomaterials Like semiconductors, small metallic clusters can absorb light and create excitons (electron-hole pairs). In ligand-capped gold clusters of 30 to 40 atoms (Au30 to Au40) that adopt the usual face-centered cubic packing, the lifetime of these excitons is ∼100 nanoseconds. Zhou et al. found that atomic packing and molecular orbital overlap can greatly affect carrier lifetimes. Despite having similar bandgaps to those of face-centered cubic clusters, a hexagonal close-packed Au30 cluster had a much shorter lifetime (∼1 nanosecond), and a body-centered cubic Au38 cluster had a lifetime of ∼5 microseconds, which is comparable to bulk silicon. Science , this issue p. [279][1] [1]: /lookup/doi/10.1126/science.aaw8007
Journal Title: Science
Year Published: 2019
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