Bi2Se3-PVDF composite: A flexible thermoelectric system

Kumar, Ashutosh; Kumar, Ravi; Satapathy, Dillip K.

doi:10.1016/j.physb.2020.412275

Cited by 21 publications

(8 citation statements)

References 26 publications

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“…GeTe also displays a second-order phase transition (∼700 K) from a high-temperature cubic ( Fm -3 m ) to a low-temperature rhombohedral (or hexagonal) structure ( R 3 m ). There has been a recent surge of interest in GeTe focusing on optimizing the TE properties and suppressing the transition temperature to achieve its better functionality during practical applications. − The realization of a high zT heavily depends on an optimized carrier concentration ( n ∼ 10 19 –10 20 cm –3 ), along with band engineering, and reducing the κ ph via hierarchical architecture engineering, defect engineering, a composite approach, − and other multiscale scattering centers. , …”

Section: Introductionmentioning

confidence: 99%

Engineering Electronic Structure and Lattice Dynamics to Achieve Enhanced Thermoelectric Performance of Mn–Sb Co-Doped GeTe

et al. 2021

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GeTe, as a p-type semiconductor, has been intensively studied in recent years as a promising lead-free midtemperature-range thermoelectric (TE) material. Herein, we report an improved energy conversion efficiency (η) using a two-step TE properties optimization in Mn−Sb co-doped GeTe by engineering electronic structure and lattice dynamics. Mn−Sb co-doping enhances the TE properties of GeTe, as evidenced from both experiments and first-principles-based theoretical calculations. The density functional theory (DFT) calculations indicate that Mn−Sb co-doping improves the band convergence and optimizes the Fermi level position. This in turn helps in enhancing the Seebeck coefficient (α). As a result of the optimized Seebeck coefficient and electrical conductivity (σ), an enhanced power factor (α 2 σ) is obtained for the Mn−Sb co-doped system. Moreover, a significant reduction in the phonon (lattice) thermal conductivity (κ ph ∼ 0.753 W/mK) at 748 K is observed for Ge 0.87 Mn 0.05 Sb 0.08 Te, attributed to the point-defect scattering and reduced phonon group velocity. The synergistic improvement in α and reduction in κ ph result in a maximum figure-of-merit (zT) of 1.67 at 773 K, with an average zT (zT av ) of ∼ 0.9 for Ge 0.87 Mn 0.05 Sb 0.08 Te over a temperature range of 300−773 K, leading to an η of ∼12.7%.

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Section: Introductionmentioning

confidence: 99%

Engineering Electronic Structure and Lattice Dynamics to Achieve Enhanced Thermoelectric Performance of Mn–Sb Co-Doped GeTe

et al. 2021

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“…The κ for pure SBTO sample is ≈ 0.4 W/m-K at 300 K. This may be due to presence of (Bi 2 O 2 ) 2+ interslab layer between (SrBi 2 Ti 4 O 13 ) 2− layer in the AP system which acts as a scattering center for phonon in the Aurivillius phase system itself [36]. Further, the κ for SBTO+50 wt%LSMO sample (≈ 0.75 W/m-K) is observed at 300 K. The mismatch in acoustic impedance between the SBTO-LSMO interface is expected due to their different sound velocity (2610 m/s for SBTO and 3170 m/s for LSMO), which leads to the acoustical mismatch in the composite [50]. However, with the increase in the LSMO/LSCO phase fraction, an increase in the κ is observed.…”

Section: 65mentioning

confidence: 98%

Colossal seebeck coefficient in Aurivillius phase-perovskite oxide composite

Kumar

Sivaprahasam

Thakur

2021

Journal of Alloys and Compounds

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“…Such microstructured arrays can enable more efficient energy harvesting in a more stretchable and flexible conformal surface mesh that is conveniently applied to the human body [9]. PVDF, with its natural flexibility, low acoustic impedance, and excellent chemical stability, is an important material to fabricate flexible energy harvesting structures in wearable devices [124][125][126][127]. 3D printing has advantages in producing piezoelectric materials, including rapid manufacturing while retaining the required piezoelectric properties of the material.…”

Section: Wearable Devicesmentioning

confidence: 99%

Recent progress in 3D printing piezoelectric materials for biomedical applications

Zeng¹,

Jiang²,

He³

et al. 2021

J. Phys. D: Appl. Phys.

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Three-dimensional (3D) printing technology has attracted significant attention for fabricating piezoelectric materials due to its high efficiency and capability to produce complex structures. Motivated by the desire to address limitations in conventional methods for fabricating piezoelectric materials, this review first introduces commonly used 3D-printing technologies to fabricate piezoelectric materials. The advantages of the technologies are evaluated. Subsequently, typical piezoelectric materials produced by 3D-printing methods are specifically discussed. The properties of the printed materials, such as dielectric and piezoelectric properties, are presented. Significant applications of 3D-printed piezoelectric materials are further explored, highlighting the potential of fabricating 3D-printed piezoelectric materials for biomedical applications. Finally, future directions and opportunities for 3D-printed piezoelectric materials are highlighted.

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Bi2Se3-PVDF composite: A flexible thermoelectric system

Cited by 21 publications

References 26 publications

Engineering Electronic Structure and Lattice Dynamics to Achieve Enhanced Thermoelectric Performance of Mn–Sb Co-Doped GeTe

Engineering Electronic Structure and Lattice Dynamics to Achieve Enhanced Thermoelectric Performance of Mn–Sb Co-Doped GeTe

Colossal seebeck coefficient in Aurivillius phase-perovskite oxide composite

Recent progress in 3D printing piezoelectric materials for biomedical applications

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