Coulomb blockade phenomenon in ultra-thin gold nanowires
Coulomb blockade phenomenon in ultra-thin gold nanowires
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DOI：
10.1063/1.3689844
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发表时间：
2012-03-01
影响因子：
3.2
通讯作者：
Maki, Hideyuki
中科院分区：
文献类型：
--
作者：
Guerin, Hoel;Yoshihira, Masanori;Maki, Hideyuki
通过在油胺基质中还原氯化金，合成了直径均匀为2 nm、长度超过100 μ m的超薄金纳米线。分散在氧化基板上的金纳米线与金属电极顶部接触，以制造背控晶体管。我们研究了所制器件的输运特性随栅极电压、偏置电压和温度的变化。近一维量子点阵列中的库仑阻塞模型很好地描述了从7K到300K的非线性电流偏置电压特性（这是由金纳米线热破碎成颗粒状材料造成的）。我们的研究结果支持这样一种观点，即电子输运在高于全局库仑封锁阈值的应用偏压下由顺序隧穿控制，而在库仑封锁制度下，非弹性共隧穿在70 K以下占主导地位，在这一点上它跨越到激活行为。通过一维阵列中每个不同点产生的库仑振荡模式的叠加，可以很好地解释电流对栅极电压的依赖性。我们发现激发能和随机库仑阻塞的竞争效应平衡了观察到的电流峰数。(C) 2012年美国物理研究所。[http://dx.doi.org/10.1063/1.3689844]
Ultra-thin gold nanowires with uniform diameters of 2 nm and lengths of over 100 mu m are synthesized via the reduction of gold(III) chloride in an oleylamine matrix. The gold nanowires, dispersed on an oxidized substrate, are top-contacted with metallic electrodes to manufacture back gated transistors. We investigate the transport properties in the fabricated devices as a function of the gate voltage, the bias voltage, and the temperature. The nonlinear current-bias voltage characteristics from 7K up to 300K are well described by the Coulomb blockade model in a nearly one-dimensional quantum dot array (which results from the gold nanowires' thermal fragmentation into a granular material). Our results support a picture in which the electronic transport is governed by sequential tunneling at an applied bias above the global Coulomb blockade threshold, whereas in the Coulomb blockade regime, inelastic cotunneling is dominant up to 70 K, at which point it crosses over to activated behavior. The current dependence on the gate voltage that shows irregular oscillations is well explained by the superimposition of Coulomb oscillation patterns generated by each different dot in the one-dimensional array. We find that the competitive effects of excitation energy and stochastic Coulomb blockade balance the number of current peaks observed. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3689844]