共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
用分子自组装技术制备出纳米金单电子器件,并测量了其伏安特性,根据单电子系统的半经典理论,用MonteCarlo法对其结果进行了模拟.结果表明,模拟出的伏安曲线与实测的伏安曲线有较好的一致性,反映了模拟方法用于单电子器件研究的合理性,此外发现,虽然单电子器件两电极间含有众多的纳米粒子,但在低压区,其伏安特性只与少数纳米粒子有关
关键词:
单电子器件
MonteCarlo模拟
分子自组装 相似文献
3.
二维纳米阵列结构因其重要的光学性能被广泛应用于各类光电子器件。本文对自组装单层SiO2纳米球掩模刻蚀法制备GaAs纳米柱二维阵列结构的关键工艺技术进行了研究。采用旋涂法在GaAs表面制备自组装单层SiO2纳米球,重点研究了GaAs表面氧等离子体亲水处理工艺对纳米球排列特性的影响,获得最佳工艺条件为功率配比100 W+80 W、腔室压力4 Pa、氧气流量20 mL/min、处理时间1200 s,并最终得到排列紧密的大面积单层纳米球薄膜。以单层纳米球为掩模,采用感应耦合等离子体刻蚀技术在GaAs表面制备了纳米柱阵列并测试了其表面光反射谱。测试结果表明,GaAs纳米柱阵列在特定波段的反射率降低至5%,远低于表面无纳米结构的薄膜材料表面高达40%的光反射。分析表明纳米柱可以激发米氏散射共振效应,从而有效降低反射率并提升光吸收。 相似文献
4.
5.
目前制备纳米材料的方法很多,其中电爆炸丝法制备纳米粉末材料是20世纪90年代后期发展起来的新型方法,俄罗斯和日本研究人员利用该方法成功制备多种金属和金属化合物纳米粉末。我国吉林大学利用该方法制备了纳米Cu-Zn合金粉末,其粒度分布在30~180nm,平均粒度约85nm。为了探索电爆炸金属丝技术在制备纳米粉末及其相关产品中的应用前景,文中对电爆炸金属丝产生纳米Al2O3和TiO2进行了实验研究,并在此基础上开展了电爆炸金属丝制备负载型纳米催化剂的初步研究。 相似文献
6.
7.
8.
由于分子尺寸小、可化学合成、与生物组织兼容等显著优点,以有机小分子为核心的单分子器件引起了人们的广泛关注,单分子器件有望成为硅基电子器件的一个重要的互补发展方向。已报道构筑单分子电子回路的大部分方法程序繁琐,且无法在平面基底上实时调控电极间的间距。这项工作采用机械切割结合电化学腐蚀的方法来制作纳米电极,通过控制施加在阴极和阳极之间的电压,并实时监测通过被腐蚀的金线的电流的大小,可以获得针尖状与分子大小匹配的纳米电极。进一步利用热胀冷缩的原理,采用比金的热膨胀系数小很多的材料作为基底,实现了环境温度对电极间距离的调控,即通过改变环境温度实现了可重复操作的电极间的连接及断开。在此温控基础之上,进一步实现了利用光强更为地精密调控电极间的距离,调控的精度可以达到原子级别。实验结果表明,我们制作的温控/光控片上纳米电极无需借助高精尖仪器,就可以实现对电极之间的距离的精密控制,其平面基底构型,为单分子电子器件的研究提供了有助于片上器件集成的新方法。 相似文献
9.
以纳米碳管和活性碳二元碳材料为催化层碳载体制备了氧扩散电极,采用稳态极化和电化学阻抗技术对其在碱性介质中氧还原反应的电催化活性进行了研究.结果表明,双载体电极比单载体纳米碳管、活性炭电极具有更高的电催化活性,纳米碳管和活性炭质量比为50∶50时双载体电极的催化活性最好;电极动力学参数测试表明,催化层中引入第二相纳米碳管载体提高了电极比表面积、电子导电性和氧还原反应速度;采用浸渍还原法在第二相纳米碳管载体中负载纳米级Pt催化剂,即使在低Pt负载量下(45.7μg/cm2)也明显改善了双载体电极的催化活性.阻抗测试表明,载Pt与未载Pt催化剂的双载体电极均受氧在薄液膜中的扩散控制. 相似文献
10.
文章讨论了纳米器件发展方向和近期的研究成果,指出是子效应和纳米结构是将来的纳米器件的两大基础,以碳纳米管和各种电极组成的纳米结构为代表,论述了不同的量子效应及其在纳米器件中的可能应用。 相似文献
11.
12.
13.
14.
We study transport of spin-polarized electrons through a magnetic single-electron transistor (SET) in the presence of an external magnetic field. Assuming the SET to have a nanometer size central island with a single-electron level we find that the interplay on the island between coherent spin-flip dynamics and Coulomb interactions can make the Coulomb correlations promote rather than suppress the current through the device. We find the criteria for this new phenomenon--Coulomb promotion of spin-dependent tunneling--to occur. 相似文献
15.
It is seen that in single-electron systems with finite-size particle distributions there is a direct correlation between a given distribution and its single-electron conductance peak spacing. In this paper we discuss the geometry, capacitance, and size distribution of particles in single-electron tunnel systems, the latter two as manifest in their tunneling characteristics. 相似文献
16.
Within the framework of the Floquet theorem, we have investigated single-electron photon-assisted tunneling in a double-well system using the transfer matrix technique. The transmission probability displays satellite peaks on both sides of the main resonance peaks and these satellite peaks originate from emission or absorption photons. The single-electron resonance tunneling can be controlled through changing the applied harmonically potential positions, such as driven potential in wells, in barriers, or in whole double-well systems. This advantage should be useful in the optimization of the parameters of a transmission device. 相似文献
17.
L. V. Litvin V. A. Kolosanov D. G. Baksheev V. A. Tkachenko A. L. Aseev 《JETP Letters》2000,72(5):264-268
It is found that single-electron current oscillations in the drain-gate characteristics of a single-electron transistor fabricated by the step-edge cutoff process, as compared to a conventional single-electron transistor, are damped several times slower and do not change their phase by π as the source-drain voltage increases. This is explained by the strong nonlinearity of the current-voltage characteristics of tunnel junctions, which is caused by the inelastic character of tunneling. 相似文献
18.
S. A. Dagesyan V. V. Shorokhov D. E. Presnov E. S. Soldatov A. S. Trifonov V. A. Krupenin O. V. Snigirev 《Moscow University Physics Bulletin》2017,72(5):474-479
We present the results of an experimental study of electron transport through individual phosphorus dopants implanted into a silicon crystal. We developed an original technique for single-electron transistor fabrication from silicon-on-insulator material with an island formed by single phosphorus atoms. The proposed method is based on well-known CMOS compatible technological processes that are standard in semiconductor electronics and may be used in most research groups. The large Coulomb blockade energy value of the investigated single-electron transistor (~20 meV) allows one to observe single-electron effects in a wide temperature range up to 77 K. We measured and analyzed stability diagrams of fabricated experimental structures. We demonstrated a single-electron transistor with controllable electron transport through two to three phosphorus dopants only. 相似文献
19.
20.
Coulomb blockade oscillations of Si single-electron transistors, which are fabricated completely by the conventional photolithography technique, have been investigated. Most of the single-electron transistors clearly show Coulomb blockade oscillations and these oscillations can be periodic by applying negative voltages to the in-plane gates. A shift of the peak positions is observed at high temperatures. It is also found that the fluctuation of the peak spacing cannot be neglected. 相似文献