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- W2509110487 abstract "Ultrafast carrier dynamics in arrays of single crystal and relatively uniform-diameter Ge nanowires (NWs) are investigated by transient absorption measurements and effective medium simulations. We present the first quantitative analysis of a Ge NW–air metamaterial, translating the photon response of the assemblies to carrier dynamics. Three time regimes of the ultrafast recombination process are identified: Auger recombination dominant (0–5 ps), “fast” surface trapping and recombination dominant (5–20 ps), and a mix of “fast” recombination and “slow” surface trapping (20–200 ps). The rates of surface recombination and their dependences on pump fluence are determined, highlighting the different interactions of electrons and holes with Ge NW surface and interface states. Structural and excitation conditions can be engineered to extend the photogenerated electron and hole lifetimes. Small wire diameters and low pump powers enhance the electron lifetime because charging of defect states in the surface oxide l..." @default.
- W2509110487 created "2016-09-16" @default.
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- W2509110487 date "2015-07-21" @default.
- W2509110487 modified "2023-10-14" @default.
- W2509110487 title "Ultrafast Carrier Dynamics of a Photo-Excited Germanium Nanowire–Air Metamaterial" @default.
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- W2509110487 doi "https://doi.org/10.1021/acsphotonics.5b00147" @default.
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