High-Performance n-type SnSe Thermoelectric Polycrystal Prepared by Arc-Melting

Gainza, Javier; Serrano‐Sánchez, Federico; Rodrigues, João Elias Figueiredo Soares; Huttel, Yves; Durá, O. J.; Koza, Michael Marek; Fernández‐Díaz, M. T.; Meléndez, Juan J.; Márkus, B. G.; Simón, F.; Martínez, José Luis; Nemes, Norbert M.

doi:10.1016/j.xcrp.2020.100263

Cited by 28 publications

(29 citation statements)

References 94 publications

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“…A mixture of stoichiometric amounts of Sn and Se powder metals, and KH as a source of K, was pelletized under N 2 atmosphere in a glove box; the pellets were arc-molten under Ar atmosphere in a watercooled Cu crucible, leading to compact ingots, which were ground to powder for structural characterization, or cold-pressed into regular disk-shaped specimens for transport measurements. Cold-pressing SnSe is sufficient for decent thermoelectric performance [77,86]; it provides samples with about 90% of the crystallographic density thanks to its malleability. On the contrary, more typical consolidation techniques, such as hot pressing [87] or spark plasma sintering [21,85], would yield higher densities but tend to deteriorate the electrical and thermal conductivities, mainly by causing intergrain oxide growth [88].…”

Section: Methodsmentioning

confidence: 99%

“…The resistivity near room temperature is about one order of magnitude lower than the resistivity of pristine SnSe; however, at high temperature, the undoped compound shows a dramatic decrease that is not mirrored by the samples doped with potassium. Among them, SnSe:K 0.05 shows the lowest resistivity, reaching 10 -3 X m at 780 K, whereas the Seebeck coefficient of the undoped SnSe made by arc-melting shows a change of sign reflecting a p-ton-type transition [77], it does not happen in any of the K-doped compounds, as they remain firmly p-type. The Seebeck coefficient of the SnSe:K x samples remains at around * 200 lV/K until it drops above * 700 K, indicating the start of bipolar conduction.…”

Section: Thermoelectric Transport Propertiesmentioning

confidence: 98%

“…In every case, the thermal conductivity of the K-doped samples is lower than that of undoped SnSe, but they all follow the same behavior corresponding to Umklapp process dominated phonon scattering [95], * aT -1 . The lattice thermal conductivity is almost entirely the total thermal conductivity, since the electronic thermal conductivity is irrelevant below * 800 K in these arc-melted tin selenides [77]. For all the samples, we obtain an ultra-low thermal conductivity [57] (\ 0.4-0.5 W/m K) at high temperature, an important feature for high-performance thermoelectric materials, probably due to the absence of tin oxides at the grain boundaries, promoted by the potassium doping [82], as well as the strong and multifaceted nanostructuring (see Fig.…”

Section: Thermoelectric Transport Propertiesmentioning

confidence: 99%

“…This synthesis produces material with elemental ratios or doping different from the nominal amount, as either dopant, tin or selenide is easily lost to the arc [73,76]. The polycrystalline n-type SnSe pellets produced by arcmelting can reach high zT up to 1.8 [77].…”

Section: Introductionmentioning

confidence: 99%

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SnSe:Kx intermetallic thermoelectric polycrystals prepared by arc-melting

et al. 2022

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Neutron powder diffraction and thermoelectric characterization of SnSe:Kx intermetallic alloys are presented. Nanostructured ingots were prepared by arc-melting elemental tin and selenium along with potassium hydride. Up to x = 0.1 of K can be incorporated into SnSe. Rietveld refinement of the diffractograms locates potassium on the Sn site in the high-temperature Cmcm structure. However, in the low-temperature Pnma structure, K cannot be localized by difference Fourier maps, indicating the incorporation of K in a disordered form in the interlayer space. STEM-EELS indicates the incorporation of K into the SnSe grains. The resistivity upon K-doping at intermediate temperatures decreases by 1–2 orders of magnitude, but at high temperature is higher than the undoped SnSe. The Seebeck coefficient of K-doped SnSe remains p-type and almost temperature independent (400 μV/K for x = 0.1). The ultralow thermal conductivity of undoped SnSe decreases further upon K-doping to below 0.3 W/m K.

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Section: Methodsmentioning

confidence: 99%

Section: Thermoelectric Transport Propertiesmentioning

confidence: 98%

Section: Thermoelectric Transport Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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SnSe:Kx intermetallic thermoelectric polycrystals prepared by arc-melting

et al. 2022

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“…This is because the improved technology mentioned above generally reduces the Seebeck coefficient by moving the Fermi level to the edge of the conductor [ 29 ]. For this reason, numerous studies have been conducted to improve the TE properties of polymer-based materials by introducing inorganic TE materials with a high Seebeck coefficient (e.g., Bi 2 Te 3 , SnSe, and Cu 2 SnSe 3 ) [ 30 , 31 , 32 ]. For instance, Ge et al [ 32 ] produced a Cu 2 SnSe 3 /PEDOT:PSS composite via spark plasma sintering to improve the TE properties.…”

Section: Introductionmentioning

confidence: 99%

Conductive PEDOT:PSS-Based Organic/Inorganic Flexible Thermoelectric Films and Power Generators

Park

Kim

2021

Polymers

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We present a simple thermoelectric device that consists of a conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)-based inorganic/organic thermoelectric film with high thermoelectric performance. The PEDOT:PSS-coated Se NWs were first chemically synthesized in situ, and then mixed with an Ag precursor solution to produce the PEDOT:PSS-coated Ag2Se NWs. The PEDOT:PSS matrix was then treated with dimethyl sulfoxide (DMSO) prior to the production of flexible PEDOT:PSS-coated Ag2Se NW/PEDOT:PSS composite films with various weight fractions of Ag2Se via a simple drop-casting method. The thermoelectric properties (Seebeck coefficient, electrical conductivity, and power factor) of the composite films were then analyzed. The composite film with 50 wt.% NWs exhibited the highest power factor of 327.15 μW/m·K2 at room temperature. The excellent flexibility of this composite film was verified by bending tests, in which the thermoelectric properties were reduced by only ~5.9% after 1000 bending cycles. Finally, a simple thermoelectric device consisting of five strips of the proposed composite film was constructed and was shown to generate a voltage of 7.6 mV when the temperature difference was 20 K. Thus, the present study demonstrates that that the combination of a chalcogenide and a conductive composite film can produce a high-performance flexible thermoelectric composite film.

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Role of Bi/Te co-dopants on the thermoelectric properties of SnSe polycrystals: an experimental and theoretical investigation

Shankar,

Prabhu,

Ashok

et al. 2024

J Mater Sci

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A sustainable solution to the energy crisis may be found in thermoelectric materials and generators, capable of transforming thermal energy into electrical energy or vice versa. SnSe is one of the emerging thermoelectric materials with distinctive properties. The main advantages of this compound are earth-abundant, inexpensive, non-toxic and it is also known for its high thermoelectric performance. Here we prepared Bi/Te co-doped SnSe polycrystals; whereas, Bi and Te are added with different compositions such as (x = 0.0,0.02,0.04,0.06 and y = 0.03) in (Sn1-xBixSe1-YTeY) matrix by using the solid-state reaction method. XRD data confirms the samples belong to the orthorhombic crystal system with the Pnma space group. DFT calculations were used to see structural stability and electronic properties for pure and doped SnSe samples. Temperature-dependent semiconducting behavior of the samples has been demonstrated by electrical resistivity. The Seebeck coefficient, correlated with carrier concentration and mobility, validates the p-type behavior for the pristine samples and the n-type behavior for co-doped samples. The dominant behavior of phonon scattering has been demonstrated by thermal conductivity analysis. After co-doping there is decrement in total thermal conductivity was observed which 1.3 times lower than SnSe. A theoretical calculation was used to validate experimental results to estimate electrical properties, Seebeck coefficient, specific heat capacity, thermal conductivity, and power factor using Quantum espresso code with Boltzmann transport Equation. 4% Bi-doped sample displayed a significant increment in electrical conductivity and an enhanced Seebeck coefficient, which led to the power factor enhancement of approximately 2.0 times in contrast to the pristine sample and enhanced ZT of about 0.055 which is 3.43 times higher than the pristine SnSe. Graphical abstract

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High-Performance n-type SnSe Thermoelectric Polycrystal Prepared by Arc-Melting

Cited by 28 publications

References 94 publications

SnSe:Kx intermetallic thermoelectric polycrystals prepared by arc-melting

SnSe:Kx intermetallic thermoelectric polycrystals prepared by arc-melting

Conductive PEDOT:PSS-Based Organic/Inorganic Flexible Thermoelectric Films and Power Generators

Role of Bi/Te co-dopants on the thermoelectric properties of SnSe polycrystals: an experimental and theoretical investigation

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