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Electron transport properties of molecular junctions formed by 1, 4-dithiolbenzene(DTB) coupled to [1,1,1] Au nanowires are investigated by using the method of non-equilibrium Green's functions based on first-principle density functional theory. Different S-Au contact configurations are constructed and optimized. The junction with tip-type Au electrode top binding to a thio (S) atom is illustrated by the best configuration for electron transport. Juntions with asymmetric electrode-DTB contact show excellent rectifying performance (the largest rectification ratio being 25.6). Other junctions display negative differential resistance (NDR) effect twice. Analysis shows that the rectifying effect may originate from the difference between the stabilities of S-Au contact modes at both sides. Molecular orbitals including the tip Au atoms are calculated. In low bias region, the orbitals near the Fermi energy dominate the electrons transmission; while, as the bias increases, those apart from the Fermi energy contribute to the transport, along with the DTB eigen-level. During the whole process, the locations and amplitude of transmission vary with bias voltage and I/V curves show two peaks, resulting in twice-NDR effect.
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Keywords:
- gold nanowire /
- contact configuration /
- negative differential resistance /
- rectification effect
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[20] Luca Sementa, Andrea Marini, Giovanni Barcaro, Fabio R. Negreiros, and Alessandro Fortunelli 2014 ACS Photonics 1 315
[21] Ci X T, Wu B T, Song M, Chen G X, Liu Y, Wu E, Zeng H P 2014 Chin. Phys. B 23 097303
[22] Wang S F, He D W, Wang Y S, Hu Y, Duan J H, Fu M, Wang W S 2014 Chin. Phys. B 23 097803
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[1] Avirm A, Ratner M A 1974 Chem. Phys. Lett. 29 277
[2] Fu X X, Zhang L X, Li Z L, Wang C K 2013 Chin. Phys. B 22 028504
[3] Zhao P, Liu D S 2012 Chin. Phys. Lett. 29 047302
[4] Ren H, Liang W, Zhao P, Liu D S 2012 Chin. Phys. Lett. 29 077301
[5] Yao Z, Postma W C, Balent S L, Dekker C 1999 Nature 402 273
[6] Metzger R M, Chen B, Hopfner U, Lakshmikantham M V, Vuillaume D, Tsuyoshi K, Wu X, Hiroki T, Terry V H, Hiromi S, Jeffrey W B, Christina H, Michael P C, Brehmer B, Geoffrey J A J. 1997 J. Am. Chem. Soc. 119 10455
[7] Ouyang M, Awschalom D D 2003 Science 301 1074
[8] Liu Y, He J, Chan M S, Du C X, Ye Y, Zhao W, Wu W, Deng W L, Wang W P 2014 Chin. Phys. B 23 097102
[9] Park J, Pasupathy A N, Goldsmith J I, Chang C, Yaish Y, Petta J R, Rinkoski M, Sethna J P, A bruna H D, McEuen P L, Ralph D C 2002 Nature 417 722
[10] Liang W J, Shores M P, Bockrath M, Long J R, Park H 2002 Nature 417 725
[11] Zhao A D, Li Q X, Chen L, Xiang H J, Wang W H, Pan S, Wang B, Xiao X D, Yang J L, Hou J G, Zhu Q S 2005 Science 309 1542
[12] Frei M, Aradhya S V, Hybertsen M S, Venkataraman L 2012 J. Am. Chem. Soc. 134 4003
[13] Chen I W P, Tseng W H, Gu M W, Su L C, Hsu C H, Chang W H, Chen C H 2013 , Angew. Chem. Int. Ed. 52 2449
[14] Liu R, Bao D L, Jiao Y, Wan L W, Li Z L, Wang C K 2014 Acta Phys. Sin. 63 068501 (in Chinese) [刘然, 包德亮, 焦扬, 万令文, 李宗良, 王传奎 2014 物理学报 63 068501]
[15] Frei M, Aradhya S V, Koentopp M, Hybertsen M S, Venkataraman L 2011 Nano Lett. 11 1518
[16] Tsua A, Osuks A 2001 Science 293 79
[17] Reimers J R, Hall L E, Cmssley M J, Hush N S 1999 J. Phys. Chem. A 103 4385
[18] Hou S M, Tao C G, Liu H W, Zhao X Y, Liu W M, Xue Z Q 2001 Acta Phys. Sin. 50 0223 (in Chinese) [侯士敏, 陶成钢, 刘虹雯, 赵兴钰, 刘惟敏, 薛增泉 2001 物理学报 50 0223]
[19] Anaïs Loubat, Marianne Imperor-Clerc, Brigitte Pansu, Florian Meneau, Bertrand Raquet, Guillaume Viau, Lise-Marie Lacroix 2014 Langmuir 30 4005
[20] Luca Sementa, Andrea Marini, Giovanni Barcaro, Fabio R. Negreiros, and Alessandro Fortunelli 2014 ACS Photonics 1 315
[21] Ci X T, Wu B T, Song M, Chen G X, Liu Y, Wu E, Zeng H P 2014 Chin. Phys. B 23 097303
[22] Wang S F, He D W, Wang Y S, Hu Y, Duan J H, Fu M, Wang W S 2014 Chin. Phys. B 23 097803
[23] Hu Y B, Zhu Y, Gao H J, Guo H 2005 Phys. Rev. Lett. 95 156803
[24] Evers F, Weigend F, Koentopp M 2004 Phys, Rev. B 69 235411
[25] Xia C J, Fang C F, Hu G C, Li D M, Liu D S, Xie S J 2007 Acta Phys. Sin. 56 4884 (in Chinese) [夏蔡娟, 房常峰, 胡贵超, 李冬梅, 刘德胜, 解士杰 2007 物理学报 56 4884]
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