Premium
Transition Voltage Spectroscopy of Porphyrin Molecular Wires
Author(s) -
Bennett Neil,
Xu Gengzhao,
Esdaile Louisa J.,
Anderson Harry L.,
Macdonald J. Emyr,
Elliott Martin
Publication year - 2010
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201001046
Subject(s) - porphyrin , monolayer , molecule , chemical physics , materials science , voltage , molecular electronics , self assembled monolayer , spectroscopy , nanotechnology , crystallography , molecular physics , chemistry , photochemistry , physics , organic chemistry , quantum mechanics
Measurements are presented of the current‐voltage ( I – V ) characteristics of individual thiol‐tethered porphyrin molecules (isolated in an alkanethiol matrix) and of self‐assembled monolayers. In both cases, it is found that I / V 2 displays a minimum at a characteristic “transition voltage” V m . Repeated measurements of the transition voltage enable both its time development and statistical behavior to be determined. For isolated molecules, the transition voltage shows a multipeaked distribution of values, indicating the presence of a small number of distinct molecular/contact configurations, each having different transport characteristics. For self‐assembled monolayers, in contrast, a single‐peaked distribution was observed, which is consistent with parallel conduction through many molecules.