Thermoelectric properties of metal/molecule/metal junction for different lengths of polythiophene

Golsanamlou, Zahra; Vishkayi, Sahar Izadi; Tagani, Meysam Bagheri; Soleimani, H. Rahimpour

doi:10.1016/j.cplett.2014.01.023

Cited by 21 publications

(13 citation statements)

References 43 publications

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“…267 In addition, the effect of molecular length on ZT has been investigated, leading to the fundamental understanding of thermoelectric properties of single-molecule devices. [268][269][270][271][272][273][274][275][276] These studies indicate that an increase of molecular length results in an enhancement of the thermopower generation, but at the cost of a considerable decrease in electronic conductance. Therefore very long molecules may not be a good choice for the design of singlemolecule thermoelectric devices.…”

Section: Thermoelectric Power In Single-molecule Junctionsmentioning

confidence: 93%

Single-molecule electronics: from chemical design to functional devices

et al. 2014

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The use of single molecules in electronics represents the next limit of miniaturisation of electronic devices, which would enable us to continue the trend of aggressive downscaling of silicon-based electronic devices. More significantly, the fabrication, understanding and control of fully functional circuits at the single-molecule level could also open up the possibility of using molecules as devices with novel, not-foreseen functionalities beyond complementary metal-oxide semiconductor technology (CMOS). This review aims at highlighting the chemical design and synthesis of single molecule devices as well as their electrical and structural characterization, including a historical overview and the developments during the last 5 years. We discuss experimental techniques for fabrication of single-molecule junctions, the potential application of single-molecule junctions as molecular switches, and general physical phenomena in single-molecule electronic devices.

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Section: Thermoelectric Power In Single-molecule Junctionsmentioning

confidence: 93%

Single-molecule electronics: from chemical design to functional devices

et al. 2014

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“…Length-dependent conductance and thermopower are usually observed and studied in junctions whose molecular linkers are chain-like structures consisting of several identical units (e.g. benzene or phenyl rings) [12,[19][20][21][22][45][46][47][48][49][50][51][52][53]. In the most of experiments, the thermopower appears to be proportional to the molecular bridge length.…”

Section: Introductionmentioning

confidence: 99%

Length-dependent Seebeck effect in single-molecule junctions beyond linear response regime

Zimbovskaya

2017

The Journal of Chemical Physics

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In the present work we theoretically study characteristics of nonlinear Seebeck effect in a singlemolecule junction with chain-like bridge of an arbitrary length. We have employed tight-binding models to compute electron transmission trough the system. We concentrate on analysis of dependences of thermovoltage V th and differential thermopower S on the bridge length. It is shown that V th becomes stronger and S grows as the bridge lengthens. We discuss the effects of the bridge coupling to the electrodes and of specific characteristics of terminal sites on the bridge on the length-dependent V th and S which appear when the system operates beyond linear response regime.

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“…The electrical and electron thermal conductances of polythiophene connected to the gold electrodes are indicated in Figure 4 versus chemical potential of the electrodes in both pure and doped PT. The both conductances decrease with increase of the molecular length owing to the reduction of the transmission at the Fermi energy [48]. It is also understood from the conductance plots of doped PT junctions that the charge transport increases in the Fermi energy and energies around it which is a gap in the pure PT junction.…”

Section: B Thermoelectric Resultsmentioning

confidence: 91%

Large thermoelectric efficiency of doped polythiophene junction: A density functional study

Golsanamlou

Tagani

Soleimani

2018

Physica E: Low-dimensional Systems and Nanostructures

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The thermoelectric properties of polythiophene (PT) coupled to the Au (111) electrodes are studied based on density functional theory combined with nonequilibrium Green function formalism.Specially, the effect of Li and Cl adsorbents on the thermoelectric efficiency of the PT junction is investigated in different concentrations of the dopants for two lengths of the PT. Results show that the presence of dopants can bring the structural changes in the oligomer and modify the arrangement of the molecular levels leading to the dramatic changes in the transmission spectra of the junction. Therefore, the large enhancement in thermopower and consequently figure of merit is obtained by dopants which makes the doped PT junction as a beneficial thermoelectric device.

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Thermoelectric properties of metal/molecule/metal junction for different lengths of polythiophene

Cited by 21 publications

References 43 publications

Single-molecule electronics: from chemical design to functional devices

Single-molecule electronics: from chemical design to functional devices

Length-dependent Seebeck effect in single-molecule junctions beyond linear response regime

Large thermoelectric efficiency of doped polythiophene junction: A density functional study

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