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 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.

SUPERCONDUCTIVITY ASSOCIATED WITH THE GRANULAR STRUCTURE IN Ba2YCu3O7−δ

1988 ◽  
Vol 02 (08) ◽  
pp. 1011-1015
Author(s):  
YONG ZHAO ◽  
QIRUI ZHANG ◽  
WEIYAN GUAN ◽  
JIANSHENG XIA ◽  
ZHENHUI HE ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Transport Properties ◽  
Single Phase ◽  
Granular Structure ◽  
Current Voltage ◽  
Granular Superconductivity ◽  
Current Voltage Characteristics ◽  
The Magnetic Field ◽  
Nonmonotonic Behavior

The dependence of the resistance on the magnetic field and the current-voltage characteristics of the single phase Ba 2 YCu 3 O 7−δ have been measured. The nonmonotonic behavior and a hysteresis of R(H) and the current-voltage characteristics suggest that the granular superconductivity exist in this material, and it plays an important role in transport properties.

Quantum-Cross Tunneling Junction for High Density Memory

2006 ◽  
Vol 961 ◽  
Author(s):  
Hideo Kaiju ◽  
Kenji Kondo ◽  
Akira Ishibashi
Keyword(s):  
Transport Properties ◽  
Barrier Height ◽  
Current Density ◽  
Tunnel Barrier ◽  
Ribbon Thickness ◽  
Barrier Thickness ◽  
Current Voltage ◽  
Thick Barrier ◽  
Current Voltage Characteristics ◽  
Interesting Behavior

ABSTRACTWe calculated transport properties of edge-to-edge quantum cross structure that consists of two metal nano-ribbons having edge-to-edge configuration with a tunnel barrier and showed current-voltage characteristics depending on the metal-ribbon thickness (5-30 nm), the barrier height (0.5-1.5 eV) and the barrier thickness (0.5-1.0 nm). Interesting behavior of transport properties is that the metal-ribbon thickness affects the current density due to the quantization of nano-ribbon and also the current density, being dependent on the barrier height and the barrier thickness, decreases with high and thick barrier. These calculated results indicate that we can precisely obtain the information on the material sandwiched between two electrodes, such as the barrier height and the barrier thickness, by a fit of experimental data to our derived equation, and these approaches result in a distinction between the sandwiched material and the electrode.

The switching behaviors induced by torsion angle in a diblock co-oligomer molecule with tailoring graphene nanoribbon electrodes

2018 ◽  
Vol 32 (04) ◽  
pp. 1850036 ◽  
Author(s):  
Aiyun Yang ◽  
Caijuan Xia ◽  
Boqun Zhang ◽  
Jun Wang ◽  
Yaoheng Su ◽  
...  
Keyword(s):  
Transport Properties ◽  
Electronic Transport ◽  
Torsion Angle ◽  
Density Functional ◽  
Graphene Nanoribbon ◽  
Molecular Device ◽  
Functional Theory ◽  
Electronic Transport Properties ◽  
Current Voltage ◽  
Current Voltage Characteristics

By applying first-principles method based on density functional theory combined with nonequilibrium Green’s function, we investigate the effect of torsion angle on the electronic transport properties in dipyrimidinyl–diphenyl co-oligomer molecular device with tailoring graphene nanoribbon electrodes. The results show that the torsion angle plays an important role on the electronic transport properties of the molecular device. When the torsion angle rotates from 0[Formula: see text] to 90[Formula: see text], the molecular devices exhibit very different current–voltage characteristics which can realize the on and off states of the molecular switch.

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.

Tuning the electronic and quantum transport properties of nitrogenated holey graphene nanoribbons

2017 ◽  
Vol 5 (45) ◽  
pp. 11856-11866 ◽  
Author(s):  
Aldilene Saraiva-Souza ◽  
Manuel Smeu ◽  
José Gadelha da Silva Filho ◽  
Eduardo Costa Girão ◽  
Hong Guo
Keyword(s):  
Transport Properties ◽  
Quantum Transport ◽  
Negative Differential Resistance ◽  
Graphene Nanoribbons ◽  
Differential Resistance ◽  
Linear Current ◽  
Current Voltage ◽  
Non Linear ◽  
Current Voltage Characteristics ◽  
Peak To Valley Ratio

Strong negative differential resistance (NDR) behavior with a remarkable current peak-to-valley ratio for armchair C2N-hNRs and non-linear current–voltage characteristics for zigzag C2N-hNRs.

scholarly journals Symmetric Negative Differential Resistance in a Molecular Nanosilver Chain

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Tae Kyung Kim ◽  
Hoi Ri Moon ◽  
Byung Hoon Kim
Keyword(s):  
Transport Properties ◽  
Electrical Transport ◽  
Negative Differential Resistance ◽  
Differential Resistance ◽  
The Self ◽  
Electrical Transport Properties ◽  
Peak Voltage ◽  
Capacitance Effect ◽  
Current Voltage ◽  
Current Voltage Characteristics

The electrical transport properties of the molecular nanosilver chain have been investigated. We observed the symmetric negative differential resistance (NDR) in the current-voltage characteristics. The peak voltage (VP) increased but the peak current (IP) decreased upon cooling. The self-capacitance effect of the silver chain crystal is suggested to explain this unconventional NDR phenomenon.

scholarly journals Calculation of CO adsorption capacity of single iron(II)- porphyrin and related electron transfer behavior by DFT theory

2020 ◽  
Author(s):  
Placido G. Mineo
Keyword(s):  
Density Functional ◽  
Co Adsorption ◽  
Molecular Wires ◽  
Molecular Wire ◽  
Dft Theory ◽  
Functional Theory ◽  
Current Voltage ◽  
End Groups ◽  
Transfer Behavior ◽  
Current Voltage Characteristics

The effect of CO adsorption on the electron transport behavior of single iron(II)-porphyrin molecular wire with sulfur end groups bonded to two gold electrodes isinvestigated using nonequilibrium Green's function formalism combined with firstprinciples density functional theory. The current-voltage characteristics of the singleFe-porphyrin molecular wires with and without CO adsorption are calculated. Theresults demonstrate that Fe-porphyrin molecular wire shows a negative differentialresistance (NDR) at 2.0 V

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