PbTe based superlattice structures with high thermoelectric efficiency

Beyer, H.; Nurnus, J.; Böttner, H.; Lambrecht, A.; Роч, Т.; Bauer, G.

doi:10.1063/1.1448388

Cited by 123 publications

(74 citation statements)

References 15 publications

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“…The dimensionless thermoelectric figure of merit, ZT , 2 of the m ∼ 18 composition material was found to reach 1.7 at 700 kelvin, compared to the highest observed ZT of only 0.84 for PbTe at 648 kelvin in n-doped material. 3,4 This is a surprisingly large enhancement in ZT for the addition of just 10% per formula-unit of silver and antimony ions. It is clearly of the greatest importance to trace the origin of the ZT enhancement.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale clusters in the high performance thermoelectricAgPbmSbTem+2

et al. 2005

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The local structure of the AgPbmSbTem+2 series of thermoelectric materials has been studied using the atomic pair distribution function (PDF) method. Three candidate-models were attempted for the structure of this class of materials using either a one-phase or a two-phase modeling procedure. Combining modeling the PDF with HRTEM data we show that AgPbmSbTem+2 contains nanoscale inclusions with composition close to AgPb3SbTe5 randomly embedded in a PbTe matrix.

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Section: Introductionmentioning

confidence: 99%

Nanoscale clusters in the high performance thermoelectricAgPbmSbTem+2

et al. 2005

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“…[3][4][5][6] At the same time, there are many low-dimensional structures made from PbTe for the purpose of enhancing its thermoelectric properties. [7][8][9] Comparing to the other preparation methods for thermoelectric materials, the method of high pressure and high temperature (HPHT) has many advantages. At first, the thermoelectric properties, which are determined by the electronic structure and interatomic interaction, are generally sensitive to pressure and temperature.…”

Section: Introductionmentioning

confidence: 99%

Electrical Transport and Thermoelectric Properties of PbTe Prepared by HPHT

et al. 2004

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In this paper, n-type lead telluride (PbTe) compounds without doping were sucessfully prepared at high pressure and high temperature (HPHT). The carrier type was induced by the effect of pressure. The results of the electrical conductivity, Seebeck coefficient, thermal conductivity for n-type PbTe, which were measured at room temperature, show that the PbTe samples prepared by HPHT exhibit the same characteristics as heavily doped semiconductors. The figure-of-merit, Z, of 5:46 Â 10 À4 K À1 was obtained, which is higher than the heavily doped samples of PbTe at room temperature. These results indicate that this method has potential application in obtaining good quality thermoelectric materials with improved properties.

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“…But more importantly, we have demonstrated, both in the linear response regime and beyond, that the efficiency of the device can be increased by strong correlations close to half-filling. Here we generalize the Meir-Wingreen formula to the case of a layered system and derive equation (12).…”

Section: Discussionmentioning

confidence: 99%

“…A high value of the figure of merit is required to obtain high efficiency. 1,3 In spite of the many theoretical and experimental efforts [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] most efficient actual devices still operate at ZT 1. 1 In this paper, we will study the impact of strong correlations on the thermoelectric properties of layered systems.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric properties of a strongly correlated layer

et al. 2017

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In this paper we investigate the effect of strong electronic interactions on the thermoelectric properties of a simple generic system, consisting of a single correlated layer sandwiched between two metallic leads. Results will be given for the linear response regime as well as beyond, for which a full nonequilibrium many-body calculation is performed, based on nonequilibrium dynamical mean-field theory (DMFT). As impurity solver we use the auxiliary master equation approach, which addresses the impurity problem within a finite auxiliary system consisting of a correlated impurity, a small number of uncorrelated bath sites and Markovian environments. For the linear response regime, results will be presented for the Seebeck coefficient, the electrical conductance and the electronic contribution to the thermal conductance. Beyond linear response, i.e. for finite differences in the temperatures and/or the bias voltages in the leads, we study the dependence of the current on various model parameters, such as gate voltage and Hubbard interaction of the central layer. We will give a detailed parameter study as far as the thermoelectric efficiency is concerned. We find that strong correlations can indeed increase the thermopower of the device. In addition, some general theoretical requirements for an efficient thermoelectric device will be given.

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PbTe based superlattice structures with high thermoelectric efficiency

Cited by 123 publications

References 15 publications

Nanoscale clusters in the high performance thermoelectricAgPbmSbTem+2

Nanoscale clusters in the high performance thermoelectricAgPbmSbTem+2

Electrical Transport and Thermoelectric Properties of PbTe Prepared by HPHT

Thermoelectric properties of a strongly correlated layer

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