Dramatic enhancement of thermoelectric power factor in PbTe:Cr co-doped with iodine

Paul, Biplab; Rawat, P. K.; Banerji, P.

doi:10.1063/1.3603962

Cited by 61 publications

(27 citation statements)

References 29 publications

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“…Numerous strategies to enhance TE performance are reported, including nanostructuring, band engineering, resonant states, convergence of electronic bands, energy filtering (EF), formation of nanocomposite materials, synergistic approach of high‐mobility electron injection, phonon glass electron crystal, scattering from nanoscale endotaxial precipitation and mesoscale grain boundaries (GBs), and quantum confinement 8,12e,13. Most of the aforementioned approaches were mostly found to be efficient in suppressing phonon transport.…”

Section: Introductionmentioning

confidence: 99%

Energy Filtering of Charge Carriers: Current Trends, Challenges, and Prospects for Thermoelectric Materials

Gayner

Amouyal

2019

Adv Funct Materials

362

231

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Exhaustive attempts are made in recent decades to improve the performance of thermoelectric materials that are utilized for waste heat-to-electricity conversion. Energy filtering of charge carriers is directed toward enhancing the material thermopower. This paper focuses on the theoretical concepts, experimental evidence, and the authors' view of energy filtering in the context of thermoelectric materials. Recent studies suggest that not all materials experience this effect with the same intensity. Although this effect theoretically demonstrates improvement of the thermopower, applying it poses certain constraints, which demands further research. Predicated on data documented in literature, the unusual dependence of the thermopower and conductivity upon charge carrier concentrations can be altered through the energy filtering approach. Upon surmounting the physical constraints discussed in this article, thermoelectric materials research may gain a new direction to enhance the power factor and thermoelectric figure of merit.

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Section: Introductionmentioning

confidence: 99%

Energy Filtering of Charge Carriers: Current Trends, Challenges, and Prospects for Thermoelectric Materials

Gayner

Amouyal

2019

Adv Funct Materials

362

231

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“…This could be partly achieved in rare-earth compounds like YbAl3, yielding very large PF at low temperatures [17]. However, those are metals with TE properties rapidly decreasing with increasing T. Alternatively, attempts to combine these apparently incompatible requirements in semiconductors have relied on the "band structure engineer ing" of narrow energy features in the density of states from in-gap and resonant states near the band edges [18][19][20][21][22].Here, we show theoretically that the seemingly conflict ing requirements formulated by Mahan and Sofo [16] can actually be combined within the same band of certain semiconductors, exploiting the highly directional character of some orbitals. This is achieved without any nanostructur ing or introduction of resonant states.…”

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confidence: 99%

Low-Dimensional Transport and Large Thermoelectric Power Factors in Bulk Semiconductors by Band Engineering of Highly Directional Electronic States

et al. 2015

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Thermoelectrics are promising for addressing energy issues but their exploitation is still hampered by low efficiencies. So far, much improvement has been achieved by reducing the thermal conductivity but less by maximizing the power factor. The latter imposes apparently conflicting requirements on the band structure: a narrow energy distribution and a low effective mass. Quantum confinement in nanostructures and the introduction of resonant states were suggested as possible solutions to this paradox, but with limited success. Here, we propose an original approach to fulfill both requirements in bulk semiconductors. It exploits the highly directional character of some orbitals to engineer the band structure and produce a type of low-dimensional transport similar to that targeted in nanostructures, while retaining isotropic properties. Using first-principle calculations, the theoretical concept is demonstrated in Fe2YZ Heusler compounds, yielding power factors 4 to 5 times larger than in classical thermoelectrics at room temperature. Our findings are totally generic and rationalize the search of alternative compounds with similar behavior. Beyond thermoelectricity, these might be relevant also in the context of electronic, superconducting, or photovoltaic applications.

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“…Other materials include magnesium silicide Mg 2 Si, germanium magnesium Mg 2 Ge, and magnesium stannate Mg 2 Sn [11,12] with the ZT coefficient at a level of 0.8. In addition, materials based on lead telluride doped with lanthanum and chromium [13] are currently enjoying a growing interest. Their ZT coefficient is 2.2 in 550 K and 1.8 in 850 K.…”

Section: Thermoelectrics -Properites and Materialsmentioning

confidence: 99%

Thermoelectric Generation Of Current – Theoretical And Experimental Analysis

Ruciński

Rusowicz

2017

Archives of Thermodynamics

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This paper provides some information about thermoelectric technology. Some new materials with improved figures of merit are presented. These materials in Peltier modules make it possible to generate electric current thanks to a temperature difference. The paper indicates possible applications of thermoelectric modules as interesting tools for using various waste heat sources. Some zero-dimensional equations describing the conditions of electric power generation are given. Also, operating parameters of Peltier modules, such as voltage and electric current, are analyzed. The paper shows chosen characteristics of power generation parameters. Then, an experimental stand for ongoing research and experimental measurements are described. The authors consider the resistance of a receiver placed in the electric circuit with thermoelectric elements. Finally, both the analysis of experimental results and conclusions drawn from theoretical findings are presented. Voltage generation of about 1.5 to 2.5 V for the temperature difference from 65 to 85 K was observed when a bismuth telluride thermoelectric couple (traditionally used in cooling technology) was used.

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Dramatic enhancement of thermoelectric power factor in PbTe:Cr co-doped with iodine

Cited by 61 publications

References 29 publications

Energy Filtering of Charge Carriers: Current Trends, Challenges, and Prospects for Thermoelectric Materials

Energy Filtering of Charge Carriers: Current Trends, Challenges, and Prospects for Thermoelectric Materials

Low-Dimensional Transport and Large Thermoelectric Power Factors in Bulk Semiconductors by Band Engineering of Highly Directional Electronic States

Thermoelectric Generation Of Current – Theoretical And Experimental Analysis

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