Thermoelectric properties and extremely low lattice thermal conductivity in p-type Bismuth Tellurides by Pb-doping and PbTe precipitation

Lin, Chan-Chieh; Ginting, Dianta; Lydia, R.; Lee, Min Ho; Rhyee, Jong‐Soo

doi:10.1016/j.jallcom.2016.02.123

Cited by 36 publications

(15 citation statements)

References 34 publications

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“…This is likely for narrow energy gap E g semiconductors or semimetals within the parabolic band assumption. Many thermoelectric materials follow the parabolic band assumption in the Pisarenko plot well . The cutoff energy E c of the minority carriers depends on the potential hybridization with minority carriers and disorder from Anderson localization.…”

Section: Resultsmentioning

confidence: 99%

Synergetic Enhancement of Thermoelectric Performance by Selective Charge Anderson Localization–Delocalization Transition in n-Type Bi-Doped PbTe/Ag₂Te Nanocomposite

et al. 2019

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Considerable efforts have been devoted to enhancing thermoelectric performance, by employing phonon scattering from nanostructural architecture, and material design using phonon-glass and electron-crystal concepts. The nanostructural approach helps to lower thermal conductivity but has limited effect on the power factor. Here, we demonstrate selective charge Anderson localization as a route to maximize the Seebeck coefficient while simultaneously preserving high electrical conductivity and lowering the lattice thermal conductivity. We confirm the viability of interface potential modification in an n-type Bi-doped PbTe/Ag 2 Te nanocomposite and the resulting enhancement in thermoelectric figure-of-merit ZT. The introduction of random potentials via Ag 2 Te nanoparticle distribution using extrinsic phase mixing was determined using scanning tunneling spectroscopy measurements. When the Ag 2 Te undergoes a structural phase transition (T > 420 K) from monoclinic β-Ag 2 Te to cubic α-Ag 2 Te, the band gap in the α-Ag 2 Te increases due to the p−d hybridization. This results in a decrease in the potential barrier height, which gives rise to partial delocalization of the electrons, while wave packets of the holes are still in a localized state. Using this strategic approach, we achieved an exceptionally high thermoelectric figure-of-merit in n-type PbTe materials, a ZT greater than 2.0, suitable for waste heat power generation.

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Section: Resultsmentioning

confidence: 99%

Synergetic Enhancement of Thermoelectric Performance by Selective Charge Anderson Localization–Delocalization Transition in n-Type Bi-Doped PbTe/Ag₂Te Nanocomposite

et al. 2019

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“…A nano compound (Bi 0.2 Sb 0.8-x Pb x ) 2 Te 3. was doped by Pb and synthesized by hot pressing sintering and with quenching technique by C.C. Lin et al [6] and their thermoelectric properties were studied .the doping of Pb and Te create a low effective mass and as a result the metallic properties improved. All the synthesized samples were just like a rhombohedra structure of Sb 2 Te 3.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sn dopant on power factor of Tl8.67Sb1.33-xSnxTe6 nanoparticles

Khan¹,

Shah²,

Tufail³

et al. 2022

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In this research work the thermoelectric and electrical performance of Sn doped Tellurium Telluride Tl8.67SnxSb1.33-xTe6 (x=0.61, 0.63, 0.65, 0.67, 0.68, 0.70), was studied. The samples were synthesized by melting method. By XRD and EDX analysis it has been confirmed that single phase tetragonal crystal structure with no any other impurities. The See beck co-efficient (thermo power) (S) shows increasing positive trend showing p-type semiconductor characteristics with whole temperature range from 300 to 550 K. At ambient temperature complex behavior of See beck coefficient for Sn doped compounds has been observed initially S decreasing with increase in Sn concentration i.e. x=0.65, and then S increases with increase in Sn contents up to x=0.70. In additional the electrical conductivity (σ) and the power factors have also shows the same complex behavior with the increase of Sn concentrations.. Telluride’s are narrow band-gap semiconductors, with all elements in common oxidation states, according to (Tl+ )9(Sb3+) (Te2- )6.It is found that the power factor is increases with Sn concentrations as well as increase in temperature range from 300-500 K.

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“…One of the best thermoelectric materials is bismuth telluride, Bi 2 T e 3 (BT) which has intrinsically low κ ph and has been studied extensively in bulk, [1,2] alloys, [3,4] thin films, nanostructures, [5] and by band engineering [6] or by chemical doping. [7][8][9] When BT is doped with In, the system behaves as electron donors and as a result it reduces both electrical resistivity and κ ph . [7] Similarly, metal and Iodide co-doping effect enhances the electrical conductivity and decreases the lattice heat conduction of BT.…”

Section: Introductionmentioning

confidence: 99%

“…[9] Reduced κ ph is also observed in metallic Pb-doped and PbTe-precipitated BT. [8] The reduced lattice thermal conductivity in all these foreign element doped BT is mainly attributed to the mechanisms such as formation of point defects, lattice distortion, grain boundary phonon scattering etc. There are numerous reports on transition metal (TM) doped BT family where the interest is strongly biased towards the properties of diluted magnetic semiconductors [10][11][12][13][14] and the heat conduction in these systems is negligibly explored.…”

Section: Introductionmentioning

confidence: 99%

Tuning the lattice thermal conductivity in Bismuth Telluride through Cr-doping

Jena,

Lee,

Bhattacharjee

2020

Preprint

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Decreasing thermal conductivity of a thermoelectric material is always a prerequisite for its potential application. Using first-principle calculations, we examine the magnetism induced change in lattice thermal transport in bismuth telluride. The source of magnetic moment, Cr in the doped system, weakly magnetizes the coordinated Te atoms to make the latter's phonon softer than that in the pure compound. Though the transition metal dopants do not participate directly in the heat conduction process, the anharmonicity induced by them favor in reducing the lattice thermal conductivity. Large anharmonicity in (Bi 0.67 Cr 0.33 ) 2 T e 3 reduces the in-plane room temperature lattice thermal conductivity by ∼ 79%. The thermal conductivity, strictly, does not vary monotonically with doping concentration. Even, for any particular doping level, the thermal conductivity is different for different configurations which is related to the internal energy of the system. We found that the internal energy variance of 0.03 eV would reduce the in-plane thermal conductivity of the room temperature lattice by at least 60% for 50% doping.

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Thermoelectric properties and extremely low lattice thermal conductivity in p-type Bismuth Tellurides by Pb-doping and PbTe precipitation

Cited by 36 publications

References 34 publications

Synergetic Enhancement of Thermoelectric Performance by Selective Charge Anderson Localization–Delocalization Transition in n-Type Bi-Doped PbTe/Ag₂Te Nanocomposite

Synergetic Enhancement of Thermoelectric Performance by Selective Charge Anderson Localization–Delocalization Transition in n-Type Bi-Doped PbTe/Ag₂Te Nanocomposite

Effects of Sn dopant on power factor of Tl8.67Sb1.33-xSnxTe6 nanoparticles

Tuning the lattice thermal conductivity in Bismuth Telluride through Cr-doping

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Thermoelectric properties and extremely low lattice thermal conductivity in p-type Bismuth Tellurides by Pb-doping and PbTe precipitation

Cited by 36 publications

References 34 publications

Synergetic Enhancement of Thermoelectric Performance by Selective Charge Anderson Localization–Delocalization Transition in n-Type Bi-Doped PbTe/Ag2Te Nanocomposite

Synergetic Enhancement of Thermoelectric Performance by Selective Charge Anderson Localization–Delocalization Transition in n-Type Bi-Doped PbTe/Ag2Te Nanocomposite

Effects of Sn dopant on power factor of Tl8.67Sb1.33-xSnxTe6 nanoparticles

Tuning the lattice thermal conductivity in Bismuth Telluride through Cr-doping

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Synergetic Enhancement of Thermoelectric Performance by Selective Charge Anderson Localization–Delocalization Transition in n-Type Bi-Doped PbTe/Ag₂Te Nanocomposite

Synergetic Enhancement of Thermoelectric Performance by Selective Charge Anderson Localization–Delocalization Transition in n-Type Bi-Doped PbTe/Ag₂Te Nanocomposite