The origin of the transition voltage of gold-alkanedithiol-gold   molecular junctions

doi:10.1016/j.chemphys.2015.11.010

CORC > 北京大学 > 信息科学技术学院

	The origin of the transition voltage of gold-alkanedithiol-gold molecular junctions
	Xiang, An ; Wang, Minglang ; Wang, Hao ; Sun, Hantao ; Hou, Shimin ; Liao, Jianhui
刊名	CHEMICAL PHYSICS
	2016
关键词	Molecular junction Electron transport Transition voltage Molecule-electrode interface SELF-ASSEMBLED MONOLAYERS ELECTRON-TUNNELING SPECTROSCOPY CHARGE-TRANSPORT AU SURFACE WIRES CONTACT STATES LEVEL
DOI	10.1016/j.chemphys.2015.11.010
英文摘要	We studied the origin of the transition voltage of octanedithiol (C8DT) molecules sandwiched between two gold electrodes. Au-C8DT-Au molecular junctions were fabricated using the feedback controlled electromigration technique. The conductance measurement and the inelastic electron tunneling spectrum validate that the observed current-voltage characteristics indeed originate from the C8DT molecule in the junction. The transition voltage of Au-C8DT-Au junctions is determined to be about 0.95 V, which cannot be interpreted using the energy difference between the highest occupied molecular orbital or lowest unoccupied molecular orbital of the alkyl chain and the Fermi level of electrodes. Instead, we relate the measured transition voltage to the Au-S bonds, which are about 1.4 eV below the gold Fermi level. Our interpretation is supported by the ultraviolet photoelectron spectroscopy measurements and first-principles quantum transport simulations. These findings provide convincing evidence that the Au-S occupied states play a significant role in the charge transport of Au-alkanedithiol-Au molecular devices. (C) 2015 Elsevier B.V. All rights reserved.; National Natural Science Foundation of China [61321001, 21573014]; MOST of China [2011CB933001, 2013CB933404]; SCI(E); ARTICLE; smhou@pku.edu.cn; Jianhui.Liao@pku.edu.cn; 40-45; 465
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438669]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Xiang, An,Wang, Minglang,Wang, Hao,et al. The origin of the transition voltage of gold-alkanedithiol-gold molecular junctions[J]. CHEMICAL PHYSICS,2016.
APA	Xiang, An,Wang, Minglang,Wang, Hao,Sun, Hantao,Hou, Shimin,&Liao, Jianhui.(2016).The origin of the transition voltage of gold-alkanedithiol-gold molecular junctions.CHEMICAL PHYSICS.
MLA	Xiang, An,et al."The origin of the transition voltage of gold-alkanedithiol-gold molecular junctions".CHEMICAL PHYSICS (2016).