Thermoelectric materials and transport physics

Jia, Ning; Cao, Jin; Tan, Xian Yi; Dong, Jinfeng; Liu, Hongfei; Tan, Chee Kiang Ivan; Xu, Jianwei; Yan, Qingyu; Loh, Xian Jun; Suwardi, Ady

doi:10.1016/j.mtphys.2021.100519

Cited by 113 publications

(64 citation statements)

References 148 publications

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“…This work provides a simple and straightforward footing for an experimental m* to address fundamental questions related to charge transport, such as the debate over whether low or high effective mass is better for thermoelectric performance. [3,4]…”

Section: Introductionmentioning

confidence: 99%

Effective Mass from Seebeck Coefficient

Snyder

Pereyra

Gurunathan

2022

Adv Funct Materials

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Engineering semiconductor devices requires an understanding of the effective mass of electrons and holes. Effective masses have historically been determined in metals at cryogenic temperatures estimated using measurements of the electronic specific heat. Instead, by combining measurements of the Seebeck and Hall effects, a density of states effective mass can be determined in doped semiconductors at room temperature and above. Here, a simple method to calculate the electron effective mass using the Seebeck coefficient and an estimate of the free electron or hole concentration, such as that determined from the Hall effect, is introduced mS∗me=0.924(300KT)(nH1020cm−3)2/3[3(exp[|S|kB/e−2]−0.17)2/31+exp[−5(|S|kB/e−kB/e|S|)]+|S|kB/e1+exp[5(|S|kB/e−kB/e|S|)]] here mnormalS∗ is the Seebeck effective mass, nH is the charge carrier concentration measured by the Hall effect (nH = 1/eRH, RH is Hall resistance) in 1020 cm−3, T is the absolute temperature in K, S is the Seebeck coefficient, and kB/e = 86.3 μV K−1. This estimate of the effective mass can aid the understanding and engineering of the electronic structure as it is largely independent of scattering and the effects of microstructure (grain boundary resistance). It is particularly helpful in characterizing thermoelectric materials.

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Section: Introductionmentioning

confidence: 99%

Effective Mass from Seebeck Coefficient

Snyder

Pereyra

Gurunathan

2022

Adv Funct Materials

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“…On the other hand, in thermoelectrics, the sea of holes (electrons) are the active charge carriers, rendering them defect tolerant. [ 18–20 ]…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, in thermoelectrics, the sea of holes (electrons) are the active charge carriers, rendering them defect tolerant. [18][19][20] Through decades of work on thermoelectrics, the physical understanding and chemical intuition in engineering their high performance are well established. [21][22][23][24][25] Strategies such as band-engineering, carrier scattering modulation, nanostructuring, resonant doping, and energy filtering have been well reported to enhance various aspects of thermoelectrics.…”

Section: Introductionmentioning

confidence: 99%

Upcycling Silicon Photovoltaic Waste into Thermoelectrics

et al. 2022

Self Cite

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Two decades after the rapid expansion of photovoltaics, the number of solar panels reaching end‐of‐life is increasing. While precious metals such as silver and copper are usually recycled, silicon, which makes up the bulk of a solar cells, goes to landfills. This is due to the defect‐ and impurity‐sensitive nature in most silicon‐based technologies, rendering it uneconomical to purify waste silicon. Thermoelectrics represents a rare class of material in which defects and impurities can be engineered to enhance the performance. This is because of the majority‐carrier nature, making it defect‐ and impurity‐tolerant. Here, the upcycling of silicon from photovoltaic (PV) waste into thermoelectrics is enabled. This is done by doping 1% Ge and 4% P, which results in a figure of merit (zT) of 0.45 at 873 K, the highest among silicon‐based thermoelectrics. The work represents an important piece of the puzzle in realizing a circular economy for photovoltaics and electronic waste.

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“…Understanding of how the bonding character affects electron and phonon transport seems significant so that the thermoelectric properties of the β‐VA monolayer (Sb, As, and P) could be predicted and controlled reliably. Notably, current investigations are mainly focused on the simple and qualitative understanding of the effects of the bonding characteristics on the electronic structure and lattice thermal conductivity, i. e., the larger bond strength leads to the larger mobility as well as the thermal conductivity [10,17–19] . However, there is a lack of a systematic and thorough research of the quantitative description of the role of bonding strength in the electronic structure and corresponding thermoelectric properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of Bond Strength on the Electronic Structure and Thermoelectric Properties of β‐VA Monolayers (Sb, As, and P)

Zhang

Huang

et al. 2022

ChemNanoMat

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First-principles calculation and Boltzmann transport theory have been combined to comparatively investigate the integration of Crystal Orbital Hamilton Populations (À ICOHP), band structures, phonon spectrums, lattice thermal conductivities, electronic transport properties, Seebeck coefficients, and thermoelectric figure of merits of β-VA monolayers (Sb, As, and P). Calculations reveal that the thermoelectric properties increase with the decrease of the bond strength, which should be mainly due to the lower lattice thermal conductivity, suitable band gap, and weakened coupling of electrons and phonons. It is also found that the ZT value of the β-Sb monolayer for the electronic along the x direction is the best among the β-VA monolayers. Furthermore, the origin of the lowest lattice thermal conductivity of the β-Sb monolayer in the β-VA monolayers (Sb, As, and P) may be attributed to the more phonon scattering channels (P 3 ) and the lower phonon velocity (v).The derived results are in good agreement with other theoretical results in the literature, and could provide a deep understanding of thermoelectric properties of the β-VA monolayer materials.

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Thermoelectric materials and transport physics

Cited by 113 publications

References 148 publications

Effective Mass from Seebeck Coefficient

Effective Mass from Seebeck Coefficient

Upcycling Silicon Photovoltaic Waste into Thermoelectrics

Effects of Bond Strength on the Electronic Structure and Thermoelectric Properties of β‐VA Monolayers (Sb, As, and P)

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