Optical and thermoelectric properties of Sb2Te3/ZnTe nanostructured composites

Kumar, K. Deva Arun; Meena, Dilip Kumar; Bose, Rapaka S. C.; Meena, Ramcharan; Murahari, Prashantha; Mele, Paolo; Ramesh, K.

doi:10.1016/j.jallcom.2021.158621

Cited by 6 publications

(7 citation statements)

References 33 publications

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“…Table 1 lists the crystallite size, Lotgering factor, density as well as refined lattice parameters (a, b, c, and V). These values are found to be closely matching with the Sb 2 Te 3 lattice parameters that have been reported [16]. As vacancies tend to shorten the lattice parameters, the pure Sb 2 Te 3 lattice monotonically decreases with increasing polymer content.…”

Section: Powder Xrd Analysissupporting

confidence: 86%

“…The indexing of all the XRD peaks has been done with p-type Sb 2 Te 3 (space group: R3m ¯h, rhombohedral, PCD Card No. 1216385) and Te phase (space group: P3 1 21, trigonal, PCD Card No: 382599) [16]. Rietveld refinement analysis was carried out using the Full Proof software.…”

Section: Powder Xrd Analysismentioning

confidence: 99%

“…For room-temperature applications, Sb 2 Te 3 is one of the best p-type thermoelectric materials [12,15]. To improve the TE efficiency of Sb 2 Te 3 several efforts have been made like the formation of nanocomposite [16][17][18][19][20][21][22][23], doping [15], orientation engineering [24], and nanostructuring [25,26]. The formation of nanocomposite has got much attention due to its advantage in reducing thermal conductivity while maintaining a high value of power factor (PF = S 2 σ) [27,28].…”

Section: Introductionmentioning

confidence: 99%

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Polymer-mixed Sb₂Te₃/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction

Meena,

Bose,

Umarji

et al. 2023

Mater. Res. Express

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Sb2Te3-based materials are potential room-temperature thermoelectric materials. In the present work, we choose polycrystalline Sb2Te3/Te nanocomposites and utilize Poly Methyl Methacrylate (PMMA) to reduce the thermal conductivity of Sb2Te3 samples. PMMA and polycrystalline Sb2Te3/Te were mixed using ball milling for nanocomposites and pellets have been made by cold press method. The composition, microstructure, and thermoelectric transport properties of Sb2Te3/Te nanocomposites are found to be influenced by PMMA. With increasing PMMA concentration a p-type to n-type transition has been observed. Because there are fewer charge carriers or the composites have a higher resistance, the thermal conductivity decreases as the PMMA increases. This research paves the way for making the best thermoelectric materials by lowering thermal conductivity through the use of polymers.

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Section: Powder Xrd Analysissupporting

confidence: 86%

Section: Powder Xrd Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polymer-mixed Sb₂Te₃/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction

Meena,

Bose,

Umarji

et al. 2023

Mater. Res. Express

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“…Two key parameters that play an important role in determining the TE performance are the resistivity (ρ) and the Seebeck coefficient (S). By using both ρ and S values, the power factor of the TE materials can be estimated by S 2 /ρ [27]. Figure 4 shows the variation in electrical resistivity as a function of temperature (300-360 K) for the synthesized films.…”

Section: Thermoelectric Propertiesmentioning

confidence: 99%

Nanostructured Oxide (SnO2, FTO) Thin Films for Energy Harvesting: A Significant Increase in Thermoelectric Power at Low Temperature

Deva Arun Kumar,

Valanarasu,

Capelle

et al. 2024

Micromachines

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Previous studies have shown that undoped and doped SnO2 thin films have better optical and electrical properties. This study aims to investigate the thermoelectric properties of two distinct semiconducting oxide thin films, namely SnO2 and F-doped SnO2 (FTO), by the nebulizer spray pyrolysis technique. An X-ray diffraction study reveals that the synthesized films exhibit a tetragonal structure with the (200) preferred orientation. The film structural quality increases from SnO2 to FTO due to the substitution of F− ions into the host lattice. The film thickness increases from 530 nm for SnO2 to 650 nm for FTO films. Room-temperature electrical resistivity decreases from (8.96 ± 0.02) × 10−2 Ω·cm to (4.64 ± 0.01) × 10−3 Ω·cm for the SnO2 and FTO thin films, respectively. This is due to the increase in the carrier density of the films, (2.92 ± 0.02) × 1019 cm−3 (SnO2) and (1.63 ± 0.03) × 1020 cm−3 (FTO), caused by anionic substitution. It is confirmed that varying the temperature (K) enhances the electron transport properties. The obtained Seebeck coefficient (S) increases as the temperature is increased, up to 360 K. The synthesized films exhibit the S value of −234 ± 3 μV/K (SnO2) and −204 ± 3 μV/K (FTO) at 360 K. The estimated power factor (PF) drastically increases from ~70 (μW/m·K2) to ~900 (μW/m·K2) for the SnO2 and FTO film, respectively.

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“…Optical thermal conductivity (κ op ) and relative phonon life time (τ p ) values are estimated from Raman spectra recorded as a function of laser power and temperature and correlated with the anisotropy in thermal conductivity [44,45]. The Raman spectra is taken on both surfaces, ⊥ to PA and || to PA, of the hot-pressed pellet.…”

Section: Raman Spectramentioning

confidence: 99%

Role of grain alignment and oxide impurity in thermoelectric properties of textured n-type Bi–Te–Se alloy

Bose¹,

Dilip²,

Mele³

et al. 2021

J. Phys. D: Appl. Phys.

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A nanostructured n-type Bi2Te2.7Se0.3 (BTS) alloy with a unique microstructure was prepared using a facile melting-rotation-quenching process followed by ball-milling and uniaxial hot-press sintering at 623 K. Anisotropy in the resulting microstructure showed anisotropic electrical and thermal transport properties in two directions normal to the pressing axis. The texture of the nanostructured BTS alloy was analyzed by x-ray diffraction and scanning electron microscopy. Based on the geometric phase analysis of a high resolution transmission electron microscopy images, abundant dislocations, high grain boundary density, and oxide impurity were identified, which act as phonon scattering centers. Higher anisotropy in thermal conductivity combined with oxide impurity resulted in an ultra-low phonon thermal conductivity of ∼0.305 W mK−1 at 423 K in the nanostructured n-type BTS in the direction parallel to the pressing axis. Laser power- and temperature-dependent Raman spectra analyses provided a deeper insight into the anisotropy in thermal transport properties. Optimum power factor and low thermal conductivity, due to the combination of grain alignment and oxide impurity, resulted in a dimensionless figure of merit (zT ) value of ∼0.75 at 423 K. In comparison, the high and opposite temperature dependences of electrical conductivity and thermal conductivity led to a better average zT value of ∼0.68 and a thermoelectric energy conversion efficiency percentage of ∼4.4% in the operating temperature range (300–423 K) in the direction parallel to the pressing axis.

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Optical and thermoelectric properties of Sb2Te3/ZnTe nanostructured composites

Cited by 6 publications

References 33 publications

Polymer-mixed Sb₂Te₃/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction

Polymer-mixed Sb₂Te₃/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction

Nanostructured Oxide (SnO2, FTO) Thin Films for Energy Harvesting: A Significant Increase in Thermoelectric Power at Low Temperature

Role of grain alignment and oxide impurity in thermoelectric properties of textured n-type Bi–Te–Se alloy

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Optical and thermoelectric properties of Sb2Te3/ZnTe nanostructured composites

Cited by 6 publications

References 33 publications

Polymer-mixed Sb2Te3/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction

Polymer-mixed Sb2Te3/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction

Nanostructured Oxide (SnO2, FTO) Thin Films for Energy Harvesting: A Significant Increase in Thermoelectric Power at Low Temperature

Role of grain alignment and oxide impurity in thermoelectric properties of textured n-type Bi–Te–Se alloy

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Product

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Polymer-mixed Sb₂Te₃/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction

Polymer-mixed Sb₂Te₃/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction