A possibility of achieving a high carrier mobility in quasi-one-dimensional organic crystals

Casian, A.; Balandin, Alexander A.; Dusciac, V.; Coropceanu, Iu.; Dusciac, R.

doi:10.1109/smicnd.2002.1105875

Cited by 4 publications

(7 citation statements)

References 9 publications

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“…Earlier, we have shown theoretically 18-20 that in some highly conducting Q1D organic crystals it is expected to obtain very high values of ZT ϳ 20. This increase can be achieved mainly due to significant mutual compensation 14,21 of both above mentioned electron-phonon interactions for a narrow strip of states in the conduction band. As a result, the relaxation time ͑E͒ as a function of carrier energy E takes the form of Lorentzian which can be rather sharp.…”

Section: Charge and Energy Transportmentioning

confidence: 99%

Violation of the Wiedemann-Franz law in quasi-one-dimensional organic crystals

Casian

2010

Phys. Rev. B

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The charge and energy transport in some highly conducting quasi-one-dimensional organic crystals is studied. Two electron-phonon interactions and scattering on impurity are considered. It is found that the Wiedemann-Franz law is strongly violated. The Lorentz number is diminished for a large interval of Fermi energy: ͑1͒ due to faster decrease in thermal conductivity than the electrical conductivity when the conduction band width is decreased, and ͑2͒ due to strong dependence of relaxation time on carrier energy. The Lorentz number becomes dependent on crystal purity and may be reduced by up to ten times and even more in comparison with ordinary materials. This is favorable for the increase of thermoelectric figure of merit ZT. It is predicted that in really existing crystals of tetrathiotetracene-iodide, when after the optimization of carrier concentration ZT = 1.4 is expected, the Lorentz number is reduced by 1.6 times with respect to the usual value.

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Section: Charge and Energy Transportmentioning

confidence: 99%

Violation of the Wiedemann-Franz law in quasi-one-dimensional organic crystals

Casian

2010

Phys. Rev. B

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“…The model of the Q1D organic crystal considered here has been described in [19,20], where only the carrier mobility and electrical conductivity were investigated. It is very important that two main interaction mechanisms of conduction electrons with acoustic vibrations of the crystalline lattice are taken into account.…”

Section: Quasi-one-dimensional Crystal Modelmentioning

confidence: 99%

“…For a QID crystal it is very important to consider both these interactions together, because, as it has been demonstrated in [19,20], the interference between these interactions can take place under special conditions. As a result, for a narrow strip of states in the conduction hand both mentioned interactions considerably compensate each other.…”

Section: Quasi-one-dimensional Crystal Modelmentioning

confidence: 99%

“…It is also known, that for temperatures higher than the maximum critical one, i n order to investigate the transport phenomena, it is possible to neglect in the first approximation the weak interaction between the chains. In this case we obtain a more simple ID crystal model [19,20].…”

Section: Quasi-one-dimensional Crystal Modelmentioning

confidence: 99%

“…We have already noted [IS] that among such materials it is possible to find good thermoelectrics with increased ZT. Extremely high .carrier mobility and electrical conductivity are also expected in QID organic crystals [19,20], but high mobility is favorable for the obtaining of high thermoelectric efficiency. In [21] we have proposed a model of QlD organic semiconductor in which values of ZT at room temperature as high as ZT-20 are predicted.…”

Section: Introductionmentioning

confidence: 99%

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A possibility to realize a high thermoelectric figure of merit in quasi-one-dimensional organic crystals

Casian

Dashevsky²,

Scherrer³

et al.

Proceedings ICT'03. 22nd International Conference on Thermoelectrics (IEEE Cat. No.03TH8726)

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The thermoelectric opportunities of some highly conducting quasi-one dimensional (QID) organic crystals are studied theoretically. The electrical conductivity, Seebeck coefficient and electronic thermal conductivity are investigated as functions of crystal parameters. Obtained dependences are used to determine the optimal expected values of ZT at room temperature. The mechanism for ZT enhancement and the needed tuning of crystal parameters in order to maximize the enhancement are analyzed in detail. It is shown that due to the interference of two main electron-phonon interaction mechanisms, values as high as ZT -20 are possible both in nand p-type QID materials. Recommendations are elaborated for the realization of such materials. IntroductionThe search of materials with a higher thermoelectric figure of merit was and remains to be an important and urgent problem of solid state physics. In the last years, the increased demand for solid state microcoolers for microelectronic

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Applications and Brief Review of Experimental Results

Ghatak¹,

Bhattacharya²

2010

Thermoelectric Power in Nanostructured Materials

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In this book, we have discussed many aspects of TPSM based on the dispersion relations of the nanostructures of different technologically important materials having different band structures in the presence of 1D, 2D, and 3D confinements of the wave-vector space of the charge carriers, respectively. In this chapter, we discuss few applications in this context in Sect. 14.2 and we shall also present a very brief review of the experimental investigations in Sect. 14.3 which is a sea in itself. Section 14.4 contains the single experimental open research problem.

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A possibility of achieving a high carrier mobility in quasi-one-dimensional organic crystals

Cited by 4 publications

References 9 publications

Violation of the Wiedemann-Franz law in quasi-one-dimensional organic crystals

Violation of the Wiedemann-Franz law in quasi-one-dimensional organic crystals

A possibility to realize a high thermoelectric figure of merit in quasi-one-dimensional organic crystals

Applications and Brief Review of Experimental Results

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