Tunable hot-electron transfer within a single core-shell nanowire.
Tunable hot-electron transfer within a single core-shell nanowire.
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DOI：
10.1103/physrevlett.107.156802
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发表时间：
2011-10
影响因子：
8.6
通讯作者：
Guannan Chen;E. Gallo;Oren D. Leaffer;T. McGuckin;P. Prete;N. Lovergine;J. Spanier
中科院分区：
文献类型：
--
作者：
Guannan Chen;E. Gallo;Oren D. Leaffer;T. McGuckin;P. Prete;N. Lovergine;J. Spanier
报道了圆柱形核-壳纳米线的热光激发电子在同轴界面上的转移。传输速率的调制通过三种不同的模式实现，表现为负差分电阻的电压起始值和电压-电流相位的很大的可调性。由于几何约束和异质结形状对热电子转移的综合影响，以及电子-电子散射率可以通过改变入射光子通量而改变，从而促进了静电门、入射光子能量和入射光子强度与传输速率的耦合，并且存在弱的电子-声子散射。这种传输速率的动态控制允许在单个纳米级器件元件内引入和控制高达∼130°的连续可调相位延迟。
We report the hot photoexcited electron transfer across the coaxial interface of a cylindrical core-shell nanowire. Modulation of the transfer rates, manifested as a large tunability of the voltage onset of negative differential resistance and of voltage-current phase, is achieved using three different modes. The coupling of electrostatic gating, incident photon energy, and the incident photon intensity to transfer rates is facilitated by the combined influences of geometric confinement and heterojunction shape on hot-electron transfer, and by electron-electron scattering rates that can be altered by varying the incident photon flux, with evidence of weak electron-phonon scattering. Dynamic manipulation of this transfer rate permits the introduction and control of a continuously adjustable phase delay of up to ∼130° within a single nanometer-scale device element.