scholarly journals Electronic conductance and thermopower of single-molecule junctions of oligo(phenyleneethynylene) derivatives

Nanoscale ◽  
2020 ◽  
Vol 12 (36) ◽  
pp. 18908-18917 ◽  
Author(s):  
Hervé Dekkiche ◽  
Andrea Gemma ◽  
Fatemeh Tabatabaei ◽  
Andrei S. Batsanov ◽  
Thomas Niehaus ◽  
...  
Keyword(s):  
Single Molecule ◽  
Gold Electrodes ◽  
Single Molecule Junctions ◽  
Electronic Conductance

OPE3 derivatives with tailored substituents are promising substrates for thermoelectric characterization using STM in single-molecule junctions with gold electrodes.

scholarly journals Correction: Electronic conductance and thermopower of single-molecule junctions of oligo(phenyleneethynylene) derivatives

Nanoscale ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 4685-4686
Author(s):  
Hervé Dekkiche ◽  
Andrea Gemma ◽  
Fatemeh Tabatabaei ◽  
Andrei S. Batsanov ◽  
Thomas Niehaus ◽  
...  
Keyword(s):  
Single Molecule ◽  
Single Molecule Junctions ◽  
Electronic Conductance

Correction for ‘Electronic conductance and thermopower of single-molecule junctions of oligo(phenyleneethynylene) derivatives’ by Hervé Dekkiche et al., Nanoscale, 2020, 12, 18908–18917, DOI: 10.1039/D0NR04413J.

Thermoelectricity at the Organic-Inorganic Interface

2010 ◽  
Author(s):  
Shannon Yee ◽  
Jonathan Malen ◽  
Pramod Reddy ◽  
Rachel Segalman ◽  
Arun Majumdar
Keyword(s):  
Single Molecule ◽  
Electronic Transport ◽  
Energy Transport ◽  
Chemical Potential ◽  
Surface States ◽  
Scanning Tunneling ◽  
The Past ◽  
Single Molecule Junctions ◽  
Electronic Conductance ◽  
Inorganic Components

Electronic transport in molecular junctions has been studied through measurements of junction thermopower to evaluate the feasibility of thermoelectric (TE) energy generation using organic-inorganic hybrid materials. Energy transport and conversion in these junctions are heavily influenced by transport interactions at the metal-molecule interface. At this interface the discrete molecular orbitals overlap with continuum electronic states in the inorganic electrodes to create unique energy landscapes that cannot be realized in the organic or inorganic components alone. Over the past decade, scanning probe microscopes have been used to study the electronic conductance of single-molecule junctions[1–5]. Recently, we conducted measurements of junction thermopower using a modified scanning tunneling microscope (STM)[6]. Through our investigations, we have determined: (i) how the addition of molecular substituent groups can be used to predictably tune the TE properties of phenylenedithiol (PDT) junctions[7], (ii) how the length, molecular backbone, and end groups affect junction thermopower[8], and (iii) where electronic transport variations originate[9]. Furthermore, we have recently found that large (10 fold) TE enhancement can be achieved by effectively altering a (noble) metal junction using fullerenes (i.e., C60, PCBM, and C70). We associate the enhancement with the alignment of the frontier orbitals of the fullerene to the chemical potential of the inorganic electrodes. We further found that the thermopower can be predictably tuned by varying the work function of the contacts. This yields considerable promise for altering the surface states at interfaces for enhanced electronic and thermal transport. This paper highlights our work using thermopower as a probe for electronic transport, and reports preliminary results of TE conversion in fullerene-metal junctions.

Nature of Electron Transport by Pyridine-Based Tripodal Anchors: Potential for Robust and Conductive Single-Molecule Junctions with Gold Electrodes

2011 ◽  
Vol 133 (9) ◽  
pp. 3014-3022 ◽  
Author(s):  
Yutaka Ie ◽  
Tomoya Hirose ◽  
Hisao Nakamura ◽  
Manabu Kiguchi ◽  
Noriaki Takagi ◽  
...  
Keyword(s):  
Electron Transport ◽  
Single Molecule ◽  
Gold Electrodes ◽  
Single Molecule Junctions

Thiophene-based Tripodal Anchor Units for Hole Transport in Single-Molecule Junctions with Gold Electrodes

2015 ◽  
Vol 6 (18) ◽  
pp. 3754-3759 ◽  
Author(s):  
Yutaka Ie ◽  
Kazunari Tanaka ◽  
Aya Tashiro ◽  
See Kei Lee ◽  
Henrique Rosa Testai ◽  
...  
Keyword(s):  
Single Molecule ◽  
Hole Transport ◽  
Gold Electrodes ◽  
Single Molecule Junctions

scholarly journals Conformations of cyclopentasilane stereoisomers control molecular junction conductance

2016 ◽  
Vol 7 (9) ◽  
pp. 5657-5662 ◽  
Author(s):  
Haixing Li ◽  
Marc H. Garner ◽  
Zhichun Shangguan ◽  
Qianwen Zheng ◽  
Timothy A. Su ◽  
...  
Keyword(s):  
Charge Transport ◽  
Single Molecule ◽  
Gold Electrodes ◽  
Molecular Junction ◽  
Ring Conformation ◽  
Single Molecule Junctions ◽  
The Impact ◽  
Junction Conductance

Here we examine the impact of ring conformation on the charge transport characteristics of cyclic pentasilane structures bound to gold electrodes in single molecule junctions.

Mechanically-Tunable Quantum Interference in Ferrocene-Based Single-Molecule Junctions

2020 ◽  
Author(s):  
María Camarasa-Gómez ◽  
Daniel Hernangómez-Pérez ◽  
Michael S. Inkpen ◽  
Giacomo Lovat ◽  
E-Dean Fung ◽  
...  
Keyword(s):  
Single Molecule ◽  
Quantum Interference ◽  
Degrees Of Freedom ◽  
Building Blocks ◽  
Ferrocene Derivative ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
The Impact ◽  
D Orbitals

Ferrocenes are ubiquitous organometallic building blocks that comprise a Fe atom sandwiched between two cyclopentadienyl (Cp) rings that rotate freely at room temperature. Of widespread interest in fundamental studies and real-world applications, they have also attracted<br>some interest as functional elements of molecular-scale devices. Here we investigate the impact of<br>the configurational degrees of freedom of a ferrocene derivative on its single-molecule junction<br>conductance. Measurements indicate that the conductance of the ferrocene derivative, which is<br>suppressed by two orders of magnitude as compared to a fully conjugated analog, can be modulated<br>by altering the junction configuration. Ab initio transport calculations show that the low conductance is a consequence of destructive quantum interference effects that arise from the hybridization of metal-based d-orbitals and the ligand-based π-system. By rotating the Cp rings, the hybridization, and thus the quantum interference, can be mechanically controlled, resulting in a conductance modulation that is seen experimentally.<br>

Charge Transfer Complexation Boosts Molecular Conductance Through Fermi Level Pinning

2018 ◽  
Author(s):  
Kun Wang ◽  
Andrea Vezzoli ◽  
Iain Grace ◽  
Maeve McLaughlin ◽  
Richard Nichols ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Single Molecule ◽  
Quantum Interference ◽  
Transmission Function ◽  
Scanning Tunneling ◽  
Charge Transfer Complexes ◽  
Tunneling Microscopy ◽  
Quantum Interference Effect ◽  
Single Molecule Junctions ◽  
Charge Transfer Complexation

We have used scanning tunneling microscopy to create and study single molecule junctions with thioether-terminated oligothiophene molecules. We find that the conductance of these junctions increases upon formation of charge transfer complexes of the molecules with tetracyanoethene, and that the extent of the conductance increase is greater the longer is the oligothiophene, i.e. the lower is the conductance of the uncomplexed molecule in the junction. We use non-equilibrium Green's function transport calculations to explore the reasons for this theoretically, and find that new resonances appear in the transmission function, pinned close to the Fermi energy of the contacts, as a consequence of the charge transfer interaction. This is an example of a room temperature quantum interference effect, which in this case boosts junction conductance in contrast to earlier observations of QI that result in diminished conductance.<br>

Dissecting Contact Mechanics from Quantum Interference in Single-Molecule Junctions of Stilbene Derivatives

Nano Letters ◽  
2012 ◽  
Vol 12 (3) ◽  
pp. 1643-1647 ◽  
Author(s):  
Sriharsha V. Aradhya ◽  
Jeffrey S. Meisner ◽  
Markrete Krikorian ◽  
Seokhoon Ahn ◽  
Radha Parameswaran ◽  
...  
Keyword(s):  
Contact Mechanics ◽  
Single Molecule ◽  
Quantum Interference ◽  
Single Molecule Junctions ◽  
Stilbene Derivatives
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