Using Pseudo-ZTs for Thermoelectric Materials Search

Tang, Shuang

doi:10.30919/esmm5f213

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…Thermoelectric technology can directly convert heat and electric power into each other without pollutant emissions [1][2][3][4][5]. As a kind of eco-friendly energy, it offers an alternative solution to relieve the energy shortage crisis [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Trace bismuth and iodine co-doping enhanced thermoelectric performance of PbTe alloys

Zhang¹,

Wang²,

Su³

et al. 2020

J. Phys. D: Appl. Phys.

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Lead telluride (PbTe) is an excellent thermoelectric material in the intermediate temperature zone and has been applied to deep space exploration, waste heat recovery and other fields. However, the low thermoelectric conversion efficiency of the n-type PbTe alloys limits its applications. Here, the thermoelectric performances have been enhanced in n-type PbTe alloys through trace bismuth (Bi) and iodine (I) co-doping. The Pb1−xBixTe1−xIx (x = 0.00%, 0.05%, 0.10%, 0.20% and 0.50%) alloys are synthesized in the single phase compounds by a stepwise synthesis method. The carrier concentration has reached an optimal concentration range within the order of 1019 cm−3. The highest absolute Seebeck coefficient of 244 μV/K is obtained for 0.05% doped alloy at 730 K. The highest absolute Seebeck coefficient leads to high power factor for 0.05% doped, especially in low- and middle-temperature range. The highest power factor ∼25 μW K−2 cm−1 has been obtained at 329 K. Complex micro-scale grain boundaries and point defects strongly increase the phonon scattering and then lead to the lowest lattice thermal conductivity of 0.64 W mK−1 at 674 K for x = 0.50%, which is 26% lower than that of pristine PbTe. As a result, the highest figure of merit, zT ∼ 0.9 has been determined in 0.20% doped samples at 725 K. Moreover, the highest average figure of merit, zTave ∼ 0.7 has been achieved in 0.05% doped samples in the 323–723 K temperature range, which is about two or three times higher than reported for single Bi or I doped PbTe samples.

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Section: Introductionmentioning

confidence: 99%

Trace bismuth and iodine co-doping enhanced thermoelectric performance of PbTe alloys

Zhang¹,

Wang²,

Su³

et al. 2020

J. Phys. D: Appl. Phys.

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“…However, there was no well-defined method to extract the value of carrier transport or scattering energy sensitivity from transport measurements until Tang pointed out that the highest achievable Seebeck coefficient could be used to infer this quantity 41 . The Seebeck coefficient characterizes the average entropy carried by each single electron or hole in the semiconducting system microscopically and appears to be the voltage generated per unit temperature gradient in the thermoelectricity production process 47 . Xu et al 42 proved that the highest achievable Seebeck coefficient increases linearly with the carrier scattering energy sensitivity in a carbon nanomaterial system once the band structure is fixed.…”

Section: Methodsmentioning

confidence: 99%

Inferring the energy sensitivity and band gap of electronic transport in a network of carbon nanotubes

Tang

2022

Sci Rep

Self Cite

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Since the industrialization of single-phase nanomaterial-based devices is still challenging, intensive research focus has been given to complex materials consisting of multiple nanoscale entities, including networks and matrices of nanowires, nanotubes, nanoribbons, or other large molecules; among these complex materials, networks of carbon nanotubes are a typical example. Detailed knowledge of the energy sensitivity and band gap of electronic transport in such a material system is difficult to detect, despite its importance in electronic, energetic and sensing applications. Here, we propose a new methodology to obtain these quantities using the measured Seebeck coefficient at a certain temperature but different Fermi levels. We discover that the network consisting of semiconducting (11,10)-carbon nanotubes actually exhibits metallic transport at room temperature. It is also interesting to verify that intrananotube ballistic transport is dominant over diffusive scattering by long-range disorder, as well as the quantum hopping resistance at the contact points. The transport asymmetry ratio between the holes and electrons (1.75) is similar to the value observed in pristine graphene samples (1.50).

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Using Pseudo-ZTs for Thermoelectric Materials Search

Abstract: View Article Online 25 with the semi-empirical thermoelectric indicator "β " for searching SE potential thermoelectric materials among the numerous candidates.

Cited by 2 publications

References 17 publications

Trace bismuth and iodine co-doping enhanced thermoelectric performance of PbTe alloys

Trace bismuth and iodine co-doping enhanced thermoelectric performance of PbTe alloys

Inferring the energy sensitivity and band gap of electronic transport in a network of carbon nanotubes

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