High-Conductance Conformers in Histograms of Single-Molecule Current–Voltage Characteristics

2014 ◽  
Vol 118 (16) ◽  
pp. 8316-8321 ◽  
Author(s):  
Wendu Ding ◽  
Christian F. A. Negre ◽  
Leslie Vogt ◽  
Victor S. Batista
Keyword(s):  
Single Molecule ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
High Conductance

scholarly journals High electronic couplings of single mesitylene molecular junctions

2015 ◽  
Vol 6 ◽  
pp. 2431-2437 ◽  
Author(s):  
Yuki Komoto ◽  
Shintaro Fujii ◽  
Tomoaki Nishino ◽  
Manabu Kiguchi
Keyword(s):  
Charge Transport ◽  
Channel Model ◽  
Single Channel ◽  
Molecular Junctions ◽  
Liquid Environment ◽  
Resonant Tunnelling ◽  
Current Voltage ◽  
Electronic Conductance ◽  
Current Voltage Characteristics ◽  
High Conductance

We report on an experimental analysis of the charge transport properties of single mesitylene (1,3,5-trimethylbenzene) molecular junctions. The electronic conductance and the current–voltage characteristics of mesitylene molecules wired into Au electrodes were measured by a scanning tunnelling microscopy-based break-junction method at room temperature in a liquid environment. We found the molecular junctions exhibited two distinct conductance states with high conductance values of ca. 10−1 G 0 and of more than 10−3 G 0 (G 0 = 2e 2/h) in the electronic conductance measurements. We further performed a statistical analysis of the current–voltage characteristics of the molecular junctions in the two states. Within a single channel resonant tunnelling model, we obtained electronic couplings in the molecular junctions by fitting the current–voltage characteristics to the single channel model. The origin of the high conductance was attributed to experimentally obtained large electronic couplings of the direct π-bonded molecular junctions (ca. 0.15 eV). Based on analysis of the stretch length of the molecular junctions and the large electronic couplings obtained from the I–V analysis, we proposed two structural models, in which (i) mesitylene binds to the Au electrode perpendicular to the charge transport direction and (ii) mesitylene has tilted from the perpendicular orientation.

scholarly journals Charge-state assignment of nanoscale single-electron transistors from their current–voltage characteristics

Nanoscale ◽  
2019 ◽  
Vol 11 (31) ◽  
pp. 14820-14827 ◽  
Author(s):  
Bart Limburg ◽  
James O. Thomas ◽  
Jakub K. Sowa ◽  
Kyle Willick ◽  
Jonathan Baugh ◽  
...  
Keyword(s):  
Charge State ◽  
Liquid Nitrogen ◽  
Single Molecule ◽  
Single Electron ◽  
Single Electron Transistors ◽  
State Assignment ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Electron Transistors ◽  
Single Molecule Transistor

The charge state of a single-molecule transistor can be determined at liquid nitrogen temperatures by simply observing the IV characteristics.

scholarly journals Current–voltage characteristics of single-molecule diarylethene junctions measured with adjustable gold electrodes in solution

2012 ◽  
Vol 3 ◽  
pp. 798-808 ◽  
Author(s):  
Bernd M Briechle ◽  
Youngsang Kim ◽  
Philipp Ehrenreich ◽  
Artur Erbe ◽  
Dmytro Sysoiev ◽  
...  
Keyword(s):  
Transport Properties ◽  
Molecular Orbital ◽  
Single Molecule ◽  
Cyano Group ◽  
Electrical Contact ◽  
Gold Electrodes ◽  
Liquid Environment ◽  
Current Voltage ◽  
End Groups ◽  
Current Voltage Characteristics

We report on an experimental analysis of the charge transport through sulfur-free photochromic molecular junctions. The conductance of individual molecules contacted with gold electrodes and the current–voltage characteristics of these junctions are measured in a mechanically controlled break-junction system at room temperature and in liquid environment. We compare the transport properties of a series of molecules, labeled TSC, MN, and 4Py, with the same switching core but varying side-arms and end-groups designed for providing the mechanical and electrical contact to the gold electrodes. We perform a detailed analysis of the transport properties of TSC in its open and closed states. We find rather broad distributions of conductance values in both states. The analysis, based on the assumption that the current is carried by a single dominating molecular orbital, reveals distinct differences between both states. We discuss the appearance of diode-like behavior for the particular species 4Py that features end-groups, which preferentially couple to the metal electrode by physisorption. We show that the energetic position of the molecular orbital varies as a function of the transmission. Finally, we show for the species MN that the use of two cyano end-groups on each side considerably enhances the coupling strength compared to the typical behavior of a single cyano group.

scholarly journals Role of solvents in the electronic transport properties of single-molecule junctions

2016 ◽  
Vol 7 ◽  
pp. 1055-1067 ◽  
Author(s):  
Katharina Luka-Guth ◽  
Sebastian Hambsch ◽  
Andreas Bloch ◽  
Philipp Ehrenreich ◽  
Bernd Michael Briechle ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Current Voltage ◽  
Tunnel Barriers ◽  
Single Molecule Junctions ◽  
Level Model ◽  
Current Voltage Characteristics ◽  
Solvent Molecules ◽  
Narrow Gaps

We report on an experimental study of the charge transport through tunnel gaps formed by adjustable gold electrodes immersed into different solvents that are commonly used in the field of molecular electronics (ethanol, toluene, mesitylene, 1,2,4-trichlorobenzene, isopropanol, toluene/tetrahydrofuran mixtures) for the study of single-molecule contacts of functional molecules. We present measurements of the conductance as a function of gap width, conductance histograms as well as current–voltage characteristics of narrow gaps and discuss them in terms of the Simmons model, which is the standard model for describing transport via tunnel barriers, and the resonant single-level model, often applied to single-molecule junctions. One of our conclusions is that stable junctions may form from solvents as well and that both conductance–distance traces and current–voltage characteristics have to be studied to distinguish between contacts of solvent molecules and of molecules under study.

Mechanical switching of current–voltage characteristics in spiropyran single-molecule junctions

Nanoscale ◽  
2020 ◽  
Vol 12 (14) ◽  
pp. 7527-7531
Author(s):  
Takashi Tamaki ◽  
Keigo Minode ◽  
Yuichi Numai ◽  
Tatsuhiko Ohto ◽  
Ryo Yamada ◽  
...  
Keyword(s):  
Single Molecule ◽  
Mechanical Stimulus ◽  
Break Junction ◽  
Current Voltage ◽  
Single Molecule Junctions ◽  
Current Voltage Characteristics

Switching of the current–distance characteristics from rectified to symmetric was observed in break junction measurements through a mechanical stimulus.

scholarly journals Investigation on Single-Molecule Junctions Based on Current–Voltage Characteristics

Micromachines ◽  
2018 ◽  
Vol 9 (2) ◽  
pp. 67 ◽  
Author(s):  
Yuji Isshiki ◽  
Yuya Matsuzawa ◽  
Shintaro Fujii ◽  
Manabu Kiguchi
Keyword(s):  
Single Molecule ◽  
Current Voltage ◽  
Single Molecule Junctions ◽  
Current Voltage Characteristics
Sign in / Sign up

Export Citation Format

Share Document