Single-Electron Effects for Probing Local Electrical Polarization Changes and Charge Hopping
Single-Electron Effects for Probing Local Electrical Polarization Changes and Charge Hopping
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DOI：
10.1002/pssb.201900253
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发表时间：
2019-09-01
影响因子：
1.6
通讯作者：
Keller, Lukas
中科院分区：
文献类型：
--
作者：
Huth, Michael;Gruszka, Peter;Keller, Lukas
利用单电子效应可以实现非常敏感的电荷或局部静电电位监测。这通常是通过在低温下工作的单电子晶体管实现的。单电子效应也可以用来探测邻近单电子器件的介电环境的局部变化。相反，通过控制受单电子效应影响的纳米结构的介电环境，可以操纵纳米结构的电子特性。在这里，纳米岛阵列被建议用于局部探测电荷、电位或介电变化。作者考虑了小型阵列，其中与附近较大电极的电容耦合导致一些纳米岛上的部分屏蔽。基于相邻纳米岛之间隧道速率的蒙特卡罗模拟被使用。这种分析范例应用于不同的场景。研究表明，纳米岛的表面氧化对库仑封锁效应有强烈的影响。演示了如何使用纳米岛阵列来探测电荷转移盐四硫丁烯-氯胺中带电畴壁的动力学。讨论了如何利用纳米岛阵列来检测介电变化，例如，在分析物暴露的纳米多孔金属有机框架中。本文还讨论了所提出的蒙特卡罗方法如何从弹性隧穿扩展到激活输运机制。
Employing single-electron effects very sensitive charge or local electrostatic potential monitoring can be accomplished. This is typically realized by single-electron transistors operating at low temperatures. Single-electron effects can also be used to probe local changes of the dielectric environment next to a single-electron device. Conversely, by controlling the dielectric environment of a nanostructure subject to single-electron effects, the electronic properties of the nanostructure can be manipulated. Here, the use of nano-island arrays is suggested for locally probing charge, potential or dielectric changes. The authors consider small arrays for which the capacitive coupling to larger electrodes nearby causes partial screening on some of the nano-islands. Monte Carlo simulations based on tunneling rates between next-neighbor nano-islands are used. This analysis is exemplarily applied to different scenarios. It is shown how surface oxidation of nano-islands strongly influences Coulomb blockade effects. It is demonstrated how nano-island arrays may be used to probe the dynamics of charged domain walls in the charge transfer salt tetrathiafulvalene-chloranil. It is discussed how nano-island arrays can be used to sense dielectric changes, e.g., in nano-porous metal-organic frameworks under analyte exposure. It is also discussed how the presented Monte Carlo approach can be extended from the elastic tunneling to the activated transport regime.