Electrical Conductance of Single Oligothiophene Molecular Wires: Temperature Effect

2011 ◽  
Vol 1286 ◽  
Author(s):  
See Kei Lee ◽  
Ryo Yamada ◽  
Shoji Tanaka ◽  
Hirokazu Tada
Keyword(s):  
Transport Mechanism ◽  
Carrier Transport ◽  
Electrical Conductance ◽  
Molecular Wires ◽  
Scanning Tunneling ◽  
Molecular Junction ◽  
Break Junction ◽  
Charge Carrier Transport ◽  
Tunneling Microscopy ◽  
Hopping Transport

ABSTRACTWe investigated temperature dependence of the electrical conductance of single oligothiophene molecular wires with the length of 2.2 nm (5-mer), 5.6 nm (14-mer) and 6.7 nm (17-mer) by using the scanning tunneling microscopy break junction method. Results show that the dominant charge carrier transport for 5-mer molecule is tunneling while for 17-mer molecule is hopping. The carrier transport mechanism of 14-mer are tunneling transport (T ≤ 350 K) and hopping transport (T > 350 K) indicating that hopping and tunnelling transport are competitive process in the molecular junction.

Observation of the transition from tunneling to hopping carrier transport through single oligothiophene molecules

2008 ◽  
Vol 1091 ◽  
Author(s):  
Ryo Yamada ◽  
Hiroaki Kumazawa ◽  
Shoji Tanaka ◽  
Hirokazu Tada
Keyword(s):  
Linear Dependence ◽  
Transport Mechanism ◽  
Carrier Transport ◽  
Electrical Conductance ◽  
Break Junction ◽  
Carrier Transport Mechanism ◽  
Molecular Length

AbstractElectrical conductance of single oligothiophene molecules with a length in the range from 2 to 9 nm was measured as a function of molecular length by a break junction method. The resistance of oligothiophenes increased exponentially from 5-mer to 14-mer while that of molecules longer than 17-mer showed linear dependence on their length. These results indicated that the carrier transport mechanism changed from tunneling to hopping around 14-mer of which the length is approximately 6 nm.

MECHANISM OF ELECTRICAL CONDUCTION THROUGH SINGLE OLIGOTHIOPHENE MOLECULES

2010 ◽  
Vol 03 (04) ◽  
pp. 245-248 ◽  
Author(s):  
SEE KEI LEE ◽  
RYO YAMADA ◽  
HIROKAZU TADA ◽  
SHOJI TANAKA
Keyword(s):  
Charge Transport ◽  
Scanning Tunneling Microscope ◽  
Transport Mechanism ◽  
Electrical Conductance ◽  
Scanning Tunneling ◽  
Break Junction ◽  
Charge Transport Mechanism ◽  
Transport Mechanisms ◽  
Thermally Activated ◽  
Molecular Length

The temperature dependence of electrical conductance of oligothiophene molecules with the length of 2.2 nm (5-mer), 5.6 nm (14-mer) and 6.7 nm (17-mer) was measured by break junction method with a scanning tunneling microscope to clarify the charge transport mechanisms. The conductance of 17-mer molecule increased exponentially with temperature whereas the conductance of 5-mer and 14-mer molecules did not change. These results indicate that the dominant charge transport mechanism changed from tunneling to thermally activated hopping at molecular length around 6.7 nm (17-mer).

scholarly journals Describing chain-like assembly of ethoxygroup-functionalized organic molecules on Au(111) using high-throughput simulations

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lokamani ◽  
Jeffrey Kelling ◽  
Robin Ohmann ◽  
Jörg Meyer ◽  
Tim Kühne ◽  
...  
Keyword(s):  
High Throughput ◽  
Energy Function ◽  
Organic Molecules ◽  
Molecular Wires ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Intermolecular Interaction Energy ◽  
One Dimensional ◽  
Coverage Density ◽  
Clustering Approach

AbstractDue to the low corrugation of the Au(111) surface, 1,4-bis(phenylethynyl)-2,5-bis(ethoxy)benzene (PEEB) molecules can form quasi interlocked lateral patterns, which are observed in scanning tunneling microscopy experiments at low temperatures. We demonstrate a multi-dimensional clustering approach to quantify the anisotropic pair-wise interaction of molecules and explain these patterns. We perform high-throughput calculations to evaluate an energy function, which incorporates the adsorption energy of single PEEB molecules on the metal surface and the intermolecular interaction energy of a pair of PEEB molecules. The analysis of the energy function reveals, that, depending on coverage density, specific types of pattern are preferred which can potentially be exploited to form one-dimensional molecular wires on Au(111).

Ion mediated charge carrier transport in a novel radiation sensitive polyoxometalate–polymer hybrid

RSC Advances ◽  
2016 ◽  
Vol 6 (50) ◽  
pp. 44838-44842 ◽  
Author(s):  
Abdus Salam Sarkar ◽  
Vishwanath Kalyani ◽  
Kenneth E. Gonsalves ◽  
Chullikkattil P. Pradeep ◽  
Suman Kalyan Pal
Keyword(s):  
Transition Metal ◽  
Charge Carrier ◽  
Transport Mechanism ◽  
Carrier Transport ◽  
Charge Carrier Transport ◽  
Carrier Transport Mechanism ◽  
Polymer Hybrid

We elucidate the carrier transport mechanism in a novel polyoxometalate–polymer (POM–MAPDST) hybrid containing molybdenum transition metal.

scholarly journals Unlocking surface octahedral tilt in two-dimensional Ruddlesden-Popper perovskites

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Yan Shao ◽  
Wei Gao ◽  
Hejin Yan ◽  
Runlai Li ◽  
Ibrahim Abdelwahab ◽  
...  
Keyword(s):  
Density Functional ◽  
Carrier Transport ◽  
Plane Surface ◽  
Structural Phase ◽  
Density Functional Theory Calculations ◽  
Spin Splitting ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Out Of Plane ◽  
Inversion Asymmetry

AbstractMolecularly soft organic-inorganic hybrid perovskites are susceptible to dynamic instabilities of the lattice called octahedral tilt, which directly impacts their carrier transport and exciton-phonon coupling. Although the structural phase transitions associated with octahedral tilt has been extensively studied in 3D hybrid halide perovskites, its impact in hybrid 2D perovskites is not well understood. Here, we used scanning tunneling microscopy (STM) to directly visualize surface octahedral tilt in freshly exfoliated 2D Ruddlesden-Popper perovskites (RPPs) across the homologous series, whereby the steric hindrance imposed by long organic cations is unlocked by exfoliation. The experimentally determined octahedral tilts from n = 1 to n = 4 RPPs from STM images are found to agree very well with out-of-plane surface octahedral tilts predicted by density functional theory calculations. The surface-enhanced octahedral tilt is correlated to excitonic redshift observed in photoluminescence (PL), and it enhances inversion asymmetry normal to the direction of quantum well and promotes Rashba spin splitting for n > 1.

scholarly journals Photo-induced carbocation-enhanced charge transport in single-molecule junctions

2020 ◽  
Vol 11 (23) ◽  
pp. 6026-6030
Author(s):  
Zhongwu Bei ◽  
Yuan Huang ◽  
Yangwei Chen ◽  
Yiping Cao ◽  
Jin Li
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Charge Transport ◽  
Single Molecule ◽  
Scanning Tunneling ◽  
Break Junction ◽  
Tunneling Microscopy ◽  
Single Molecule Junctions

We report the first example of photo-induced carbocation-enhanced charge transport in triphenylmethane junctions using the scanning tunneling microscopy break junction (STM-BJ) technique.

Sign in / Sign up

Export Citation Format

Share Document