Structural and morphological properties of nanostructured Bi2Te3 with Mn-doping for thermoelectric applications

Kavita, .; Gupta, Vivek; Ranjeet,

doi:10.1016/j.matpr.2021.11.101

Cited by 13 publications

(5 citation statements)

References 17 publications

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“…The increase in the lattice constant 'a' and 'c' with increasing concentrations of Ca and Sb is due to the larger radius of Ca and Sb than Bi. The crystallite size was obtained by utilizing Debye-Scherrer's formula given below [4];…”

Section: Characterization Techniquesmentioning

confidence: 99%

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Enhancement in thermoelectric performance of hydrothermally synthesized Ca and Sb co-doped Bi₂Te₃ nanostructures

Rani,

Gupta,

Dalal

et al. 2024

Phys. Scr.

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Ca & Sb co-doped Bi2Te3 compounds have been prepared by hydrothermal method at 210 ℃ for 24 hr and investigated their thermoelectric properties. Phase purity and crystallinity were analyzed by XRD. All the prepared samples have rhombohedral crystal structure with space group R-3m. The hexagonal nanoplate-like morphology was examined by FESEM. Elemental analysis was done with EDX. Band gap energy of prepared samples has values in the range of ~0.40-0.65 eV, obtained by Tauc plot. The Raman shift was obtained at a lower frequency with doping. Carrier concentration increased with doping from 3.18×1020 cm-1 to 9.34×1020 cm-1. The high value of power factor (PF) of ~10.8 ×10-4 Wm-1K-2 was obtained due to high carrier concentration. An ultralow lattice thermal conductivity of ~0.28 and ~0.63 W/mK at 420 K, was obtained for Ca0.06Bi1.88Sb0.06Te3 and pure Bi2Te3, respectively. A maximum ZT of ~0.78 at 386 K was obtained for Ca0.03Bi1.94Sb0.03Te3. The value of ZT thus obtained is about ~ 51% higher than the ZT of pure Bi2Te3 (~0.39 at 386 K).

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Section: Characterization Techniquesmentioning

confidence: 99%

“…Thermoelectric devices are very portable and reliable, offering a potential approach to energy recovery. These have multifold advantages like silent operation, compactness, etc [3,4]. The future of thermoelectricity in a wide range of applications is bright, particularly in solid-state power production and refrigeration.…”

Section: Introductionmentioning

confidence: 99%

Enhancement in thermoelectric performance of hydrothermally synthesized Ca and Sb co-doped Bi₂Te₃ nanostructures

Rani,

Gupta,

Dalal

et al. 2024

Phys. Scr.

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“…According to a previous report, Sn-Te chemical bonds are softened via Mn doping, and the lattice thermal conductivity is decreased [6]. The Solvothermal route is a very efficient method for the synthesis of nanostructured materials [23][24][25][26][27][28]. This approach of material synthesis is scalable, low-cost, and requires relatively low processing temperatures.…”

Section: Introductionmentioning

confidence: 99%

Improvement in thermoelectric properties of Zn–Mn co-doped nanostructured SnTe through band engineering and chemical bond softening

Bugalia,

Gupta,

Pandey

2024

J. Phys. D: Appl. Phys.

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In this work, we used solvothermal technique to synthesize thermoelectrically viable Zn-Mn co-doped SnTe materials. However, the thermoelectric performance of pure SnTe is subpar due to the significant energy gap between its valence bands, inherent Sn-vacancies, and high electrical thermal conductivity. Band structure engineering and carrier concentration optimization of SnTe following Zn-Mn co-doping have the potential to enhance the Seebeck coefficient. In turn, a boost in the Seebeck coefficient significantly improved the power factor in Sn0.89Mn0.09Zn0.02Te by about five times as compared to pure SnTe at 473 K. The minimum lattice thermal conductivity (κL) in Sn0.89Mn0.09Zn0.02Te is 0.54 Wm-1K-1 at 473 K, which is almost half that of pure SnTe. The lower lattice thermal conductivity of co-doped samples may be a result of (i) a decrease in phonon group velocity by chemical bond softening and (ii) phonon scattering caused by nanostructuring, point defects, and grain boundaries. Consequently, maximum zT=0.11 has been achieved in Sn0.89Mn0.09Zn0.02Te at 473 K, which is about five times that of pristine SnTe. Material quality factor (B) of Sn0.89Mn0.09Zn0.02Te is almost triple that of pristine SnTe at 473 K, which implies that Zn-Mn co-doped SnTe is more suited to construct a thermoelectric device. An increase in electric transport properties (weighted mobility and electronic quality factor) and a decrease in κL after Zn-Mn co-doping contribute to the enhancement of B. The findings of this investigation suggest that the addition of Zn and Mn to SnTe can improve its TE performance.

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“…Though large cross-sectional area can make use of heat effectively, and reduce the adverse effects of thermal convection and radiation, the related small internal resistance could properly result in additional power loss in the circuit. For instance, the η value of the Mg 3 Sb 2 -based TEG is 8.2% when increasing the cross-sectional area of legs, where the corresponding power loss is 8.9% at Δ T of 260 K. 10 Previous studies have focused more on reducing electrical contact resistance r c , 23–25 or optimizing materials performance, 5,6,26 and thus on improving the output performance and stability; however, the limited optimization cannot meet the current needs.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the output performance and parasitic depletion of Bi₂Te₃-based thermoelectric generators by using a high-density approach

Ren

Zhou

et al. 2023

J. Mater. Chem. A

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Structural and morphological properties of nanostructured Bi2Te3 with Mn-doping for thermoelectric applications

Cited by 13 publications

References 17 publications

Enhancement in thermoelectric performance of hydrothermally synthesized Ca and Sb co-doped Bi₂Te₃ nanostructures

Enhancement in thermoelectric performance of hydrothermally synthesized Ca and Sb co-doped Bi₂Te₃ nanostructures

Improvement in thermoelectric properties of Zn–Mn co-doped nanostructured SnTe through band engineering and chemical bond softening

Optimizing the output performance and parasitic depletion of Bi₂Te₃-based thermoelectric generators by using a high-density approach

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Structural and morphological properties of nanostructured Bi2Te3 with Mn-doping for thermoelectric applications

Cited by 13 publications

References 17 publications

Enhancement in thermoelectric performance of hydrothermally synthesized Ca and Sb co-doped Bi2Te3 nanostructures

Enhancement in thermoelectric performance of hydrothermally synthesized Ca and Sb co-doped Bi2Te3 nanostructures

Improvement in thermoelectric properties of Zn–Mn co-doped nanostructured SnTe through band engineering and chemical bond softening

Optimizing the output performance and parasitic depletion of Bi2Te3-based thermoelectric generators by using a high-density approach

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Enhancement in thermoelectric performance of hydrothermally synthesized Ca and Sb co-doped Bi₂Te₃ nanostructures

Enhancement in thermoelectric performance of hydrothermally synthesized Ca and Sb co-doped Bi₂Te₃ nanostructures

Optimizing the output performance and parasitic depletion of Bi₂Te₃-based thermoelectric generators by using a high-density approach