Improved thermoelectric performance of Se-doped n-type nanostructured Bi2Te3

Rani, Kavita; Gupta, Vivek; Ranjeet,; Pandey, Abhishek

doi:10.1007/s10854-023-10490-y

Cited by 10 publications

(5 citation statements)

References 49 publications

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“…Crystallite size obtained from Debye's Scherrer's formula is not very precise due to the presence of some other contributions like micro strain. So, Williamson-Hall (W-H) plot was used to obtain the average crystallite size and micro-strain in the prepared samples [22]. given in table 2.…”

Section: Resultsmentioning

confidence: 99%

“…The samples were analyzed by UV Visible Spectrometer at room temperature to obtain the band gap energy. Tauc's equation was used for getting Band gap energy [22,35];…”

Section: Uv Visible Spectroscopymentioning

confidence: 99%

“…The quantum confinement effect and lower k tot of low-dimensional materials compared to bulk materials with better thermoelectric efficiency at an absolute temperature have reignited interest in TE materials [14,[19][20][21]. Several dopants like Se, Sb, Cu, Mg, Cl, Ti, Ca, Pd, S, In, etc have been used for improving the thermoelectric efficiency [22][23][24][25][26][27]. Sb enhances the band gap of the Bi 2 Te 3 [6].…”

Section: Introductionmentioning

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: Resultsmentioning

confidence: 99%

“…The samples were analyzed by UV Visible Spectrometer at room temperature to obtain the band gap energy. Tauc's equation was used for getting Band gap energy [22,35];…”

Section: Uv Visible Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

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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“…Their efficient absorption of specific wavelengths of light makes them suitable for applications in thermal radiation sensing and other optical detection technologies. 9 Furthermore, the ability to modulate their optical properties upon application of external stimuli, like temperature and electric field, enhances their utility in photonic devices. Due to their mid-infrared absorption capabilities, Bi 2 Te 3 thin films serve as effective materials for infrared photodetectors.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent Raman and photoresponse studies of Bi₂Te₃ thin films annealed at different temperatures for improved optoelectronic performance

Das,

Senapati,

Alagarasan

et al. 2024

Mater. Adv.

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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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Improved thermoelectric performance of Se-doped n-type nanostructured Bi2Te3

Cited by 10 publications

References 49 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

Temperature dependent Raman and photoresponse studies of Bi₂Te₃ thin films annealed at different temperatures for improved optoelectronic performance

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

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Improved thermoelectric performance of Se-doped n-type nanostructured Bi2Te3

Cited by 10 publications

References 49 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

Temperature dependent Raman and photoresponse studies of Bi2Te3 thin films annealed at different temperatures for improved optoelectronic performance

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

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Resources

About

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

Temperature dependent Raman and photoresponse studies of Bi₂Te₃ thin films annealed at different temperatures for improved optoelectronic performance