Electron transport in self-assembled polymer molecular junctions

Wenping Hu, Jun Jiang, Hiroshi Nakashima, Yi Luo, Yoshiaki Kashimura, Ke Qiu Chen, Z. Shuai, Kazuaki Furukawa, Wei Lu, Yunqi Liu, Daoben Zhu, Keiichi Torimitsu

Research output: Contribution to journalArticlepeer-review

77 Citations (Scopus)

Abstract

A molecular junction of a poly(p-phenyleneethynylene)s derivative with thioacetate end groups (TA-PPE) was fabricated by self-assembling. Nanogap electrodes made by electroplating technique was used to couple thiol end groups of TA-PPE molecules. Room temperature current-voltage characteristics of the molecular junction exhibited highly periodic, repeatable, and identical stepwise features. First-principles calculations suggest that one possibility for the equidistant step is due to the opening of different conducting channels that corresponds to the unoccupied molecular orbitals of the polymer in the junction. It is interesting to see that an 18 nm long polymer is of quantized electronic structures and behaves like a quantum transport device.

Original languageEnglish
Article number027801
JournalPhysical review letters
Volume96
Issue number2
DOIs
Publication statusPublished - 2006 Jan 20
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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