Open AccessA versatile low-temperature setup for the electrical characterization of single-molecule junctions
Author(s) -
Christian A. Martin,
R. H. M. Smit,
René van Egmond,
Herre S. J. van der Zant,
J. M. van Ruitenbeek
Publication year - 2011
Publication title -
review of scientific instruments
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.605
H-Index - 165
eISSN - 1089-7623
pISSN - 0034-6748
DOI - 10.1063/1.3593100
Subject(s) - materials science , bending , actuator , optoelectronics , liquid helium , electrode , transistor , characterization (materials science) , nanotechnology , computer science , helium , voltage , electrical engineering , physics , atomic physics , composite material , quantum mechanics , artificial intelligence , engineering
We present a modular high-vacuum setup for the electrical characterization of single molecules down to liquid helium temperatures. The experimental design is based on microfabricated mechanically controllable break junctions, which offer control over the distance of two electrodes via the bending of a flexible substrate. The actuator part of the setup is divided into two stages. The slow stage is based on a differential screw drive with a large bending range. An amplified piezoceramic actuator forms the fast stage of the setup, which can operate at bending speeds of up to 800 ?m/s. In our microfabricated break junctions this is translated into breaking speeds of several 10 nm/s, sufficient for the fast acquisition of large statistical datasets. The bandwidth of the measurement electronics has been optimized to enable fast dI/dV spectroscopy on molecular junctions with resistances up to 100 M?. The performance of the setup is demonstrated for a ?-conjugated oligo(phenyleneethynylene)-dithiol molecule
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