Current rectification by molecules with asymmetric tunneling barriers

Details Current rectification by molecules with asymmetric tunneling barriers Current rectification by molecules with asymmetric tunneling barriers

2002-05-31

arxiv.org/abs/cond-mat/0206002v2

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 10 figures; figures 2 and 3 now included in the text

Scientific paper

10.1103/PhysRevB.66.165436

A simple experimentally accessible realization of current rectification by molecules (molecular films) bridging metal electrodes is described. It is based on the spatial asymmetry of the molecule and requires only one resonant conducting molecular level (pi-orbital). The rectification, which is due to asymmetric coupling of the level to the electrodes by tunnel barriers, is largely independent of the work function difference between the two electrodes. Results of extensive numerical studies of the family of suggested molecular rectifiers HS-(CH2)_m-C6H4-(CH2)_n-SH are presented. The highest rectification ratio ~500 is achieved at m = 2 and n = 10.

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