n and p type character of single molecule diodes.

Abstract:

:Looking for single molecule electronic devices, we have investigated the charge transport properties of individual tetra-phenylporphyrin molecules on different substrates by ultrahigh-vacuum scanning tunneling microscopy and spectroscopy and by first-principles calculations. The tetra-phenylporphyrins with a Co atom (Co-TPP) or 2 hydrogens (H2-TPP) in the central macrocycle when deposited on Cu3Au(100) substrates showed a diode-like behavior with p and n type character, respectively. After removing the central hydrogens of H2-TPP molecule with the STM tip an ohmic behavior was measured. The rectifying effect was understood from the theoretical point of view by assuming for Co-TPP HOMO conduction and for H2-TPP LUMO conduction, both selectively elected by the hybridization of states between molecule and substrate surface.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zoldan VC,Faccio R,Pasa AA

doi

10.1038/srep08350

subject

Has Abstract

pub_date

2015-02-10 00:00:00

pages

8350

issn

2045-2322

pii

srep08350

journal_volume

5

pub_type

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