A5014508580- Advanced Thermoelectric Materials and Devices
- Thermal properties of materials
- Thermal Radiation and Cooling Technologies
- Chalcogenide Semiconductor Thin Films
- Heusler alloys: electronic and magnetic properties
- Topological Materials and Phenomena
- Phase-change materials and chalcogenides
- Thermal Expansion and Ionic Conductivity
- 2D Materials and Applications
- Perovskite Materials and Applications
- Advanced Semiconductor Detectors and Materials
- Layered Double Hydroxides Synthesis and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Optical properties and cooling technologies in crystalline materials
- Magnetic and transport properties of perovskites and related materials
- Solid-state spectroscopy and crystallography
- Graphene research and applications
- Semiconductor materials and interfaces
- Intermetallics and Advanced Alloy Properties
- Machine Learning in Materials Science
- Copper-based nanomaterials and applications
- Rare-earth and actinide compounds
- Electrocatalysts for Energy Conversion
- Transition Metal Oxide Nanomaterials
- Advanced battery technologies research
Jawaharlal Nehru Centre for Advanced Scientific Research
2021-2025
Tamkang University
2023
University of Calcutta
2017-2022
University of Reading
2021
Royal Holloway University of London
2021
Raiganj University
2021
Rutherford Appleton Laboratory
2021
Moscow Institute of Physics and Technology
2021
UGC DAE Consortium for Scientific Research
2021
Lomonosov Moscow State University
2021
Chemical bonding present in crystalline solids has a significant impact on how heat moves through lattice, and with the right chemical tuning, one can achieve extremely low thermal conductivity. The desire for intrinsically lattice conductivity (κlat) gained widespread attention thermoelectrics, refractories, nowadays photovoltaics optoelectronics. Here we have synthesized high-quality ingot of cubic metal halide CuBiI4 explored its transport properties. It exhibits an ultralow κlat...
Abstract Achieving glass‐like ultra‐low thermal conductivity in crystalline solids with high electrical conductivity, a crucial requirement for high‐performance thermoelectrics , continues to be formidable challenge. A careful balance between and transport is essential optimizing the thermoelectric performance. Despite this inherent trade‐off, experimental realization of an ideal material phonon‐glass electron‐crystal (PGEC) nature has rarely been achieved. Here, PGEC‐like AgSbTe 2...
Extreme electronic band convergence and nano/meso-structured phonon scattering leading to ultra-high thermoelectric performance in the near cubic Sb doped GeTe.
Silver vacancy-induced nanoscale cation ordering in AgSbTe 2 elevates its thermoelectric performance.
Defect engineering, achieved by precise tuning of the atomic disorder within crystalline solids, forms a cornerstone structural chemistry. This nuanced approach holds potential to significantly augment thermoelectric performance synergistically manipulating interplay between charge carrier and lattice dynamics. Here, current study presents distinctive investigation wherein introduction Hg doping into AgSbTe2 serves partially curtail disorder. strategic maneuver mitigates fluctuations...
An ultrahigh zT of 2.5 at 723 K is achieved in an entropy driven Ge 0.84 Pb 0.025 Sn Sb 0.11 Te sample showing a promising output power density (PD max ) ∼590 mW cm −2 Δ T = 448 fabricated double leg device.
Hybrid layered double perovskites (HLDPs), representing the two-dimensional manifestation of halide perovskites, have elicited considerable interest owing to their intricate chemical bonding hierarchy and structural diversity. This intensified stems from diverse options available for selecting alternating octahedral coordinated trivalent [M(III)] monovalent metal centers [M(I)], along with distinctive nature cationic organic amine located between layers. Here, we synthesized three new...
The interplay between charges and spins may influence the dynamics of carriers determine their thermoelectric properties. In that respect, magneto-thermoelectric power MTEP, i.e. measurements Seebeck coefficient
Ferecrystals, a distinctive class of misfit layered compounds, hold significant promise in manipulating the phonon transport owing to their two-dimensional (2D) natural superlattice-type structure and turbostratic (rotational) disorder present between constituent layers. Integrating these 2D intergrowth structures as nanodomains embedded bulk thermoelectric matrix is formidable challenge synthetic chemistry, yet offers groundbreaking opportunities for efficient thermoelectrics. Here, we have...
The discovery of topological quantum materials harboring Dirac-like massless surface states with high charge carrier mobility presents an exciting opportunity for unlocking superior thermoelectric (TE) performance, contingent upon accessing the unique properties nontrivial (TSS). However, harnessing these exotic TSS necessitates precise positioning Fermi level (EF) within insulating bulk band gap. Unfortunately, inherent defects often result in EF being submerged deep into bands, rendering...
Abstract Bi 2 Te 3 , an archetypical tetradymite, is recognised as a thermoelectric (TE) material of potential application around room temperature. However, large energy gap (Δ E c ) between the light and heavy conduction bands results in inferior TE performance pristine bulk n -type . Herein, we propose enhancement through purposefully manipulating defect profile band convergence mechanism. Two samples, S1 S2, are prepared by melting method under different synthesis condition. The...
Abstract The consequences of broken long‐range atomic arrangement in glasses or amorphous solids are reflected the temperature dependence lattice thermal conductivity (κ lat ). However, appearance glassy ultralow κ a crystalline solid with high electrical transport like metal is unusual but can have remarkable impact on thermoelectric performance material. Here, an ultra‐high demonstrated maximum figure merit, zT ≈ 2.7 (≈2.92 Dulong–Petit heat capacity) via achieving along significant ball...
The realization of remarkable thermoelectric (TE) properties in a novel single-crystalline quantum material is topic prime interest the field thermoelectricity. It necessitates proper understanding transport under magnetic and at low field. We report polarized Raman spectroscopic study, TE properties, magneto-resistance (MR) along with characterization Bi2Se3. Polarized spectrum confirms strong polarization effect A1g1 A1g2 phonon modes, which verifies anisotropic nature Bi2Se3 single...
Metal chalcohalides, owing to their higher stability over halides and greater tunability of electronic features chalcogenides, open new avenues for investigating properties materials. Complex metal chalcohalides can be a good choice thermoelectric studies halide-like low thermal conductivity chalcogenide-like high electrical conductivity. Here, we have investigated the
The phonon anharmonicity in Se-doped $\mathrm{S}{\mathrm{b}}_{2}\mathrm{T}{\mathrm{e}}_{3}$ system is probed both macroscopically and microscopically using temperature-dependent synchrotron powder diffraction, Raman spectroscopic studies, heat-capacity measurements. Gruneisen parameter (${\ensuremath{\gamma}}_{\mathrm{G}}$) calculated to explain the polycrystalline $\mathrm{S}{\mathrm{b}}_{2}\mathrm{T}{\mathrm{e}}_{3\ensuremath{-}x}\mathrm{S}{\mathrm{e}}_{x}$ samples. thermal variation of...
Improvement in thermoelectric parameters is reported with graphite incorporation n-type Bi2Te3/graphite nanocomposite systems. In-depth properties of nanostructured composites are probed both microscopically and macroscopically using x-ray diffraction, Raman spectroscopy, inelastic neutron scattering, measurement the temperature dependence thermal conductivity κ, Seebeck coefficient S, resistivity ρ, carrier concentration nH. spectroscopic analysis confirms that introduces defects disorder...
We report the enhancement of electron mobility and power factor for 3D topological insulator Bi2Te3 with Cobalt (Co) doping. Thermal variation resistivity (ρ), thermopower (S), carrier concentration (nH), magneto-resistance (MR), magnetization measurements have been performed on synthesized Cobalt-doped n-type Bi2Te3, viz., Bi2−xCoxTe3 (x = 0, 0.05, 0.1) samples. Theoretical simulation electrical thermal transport parameters has done in frame Boltzmann equation approach shows satisfactory...
Sb
Thermoelectric properties of nanostructured Sb2Te3/graphite composites are investigated both experimentally and theoretically the contribution graphite to heat transport mechanism is addressed. XRD results indicate solid state insolubility phase in Sb2Te3 as no shift observed diffraction peaks corresponding composite samples. Raman spectroscopic analysis confirms presence Temperature dependence carrier concentration nH, thermal conductivity κ, Seebeck coefficient S, resistivity ρ, and,...
Te-impurity-incorporated ${\mathrm{Sb}}_{2}{\mathrm{Te}}_{3}$, i.e., ${\mathrm{Sb}}_{2}{\mathrm{Te}}_{3}+x\phantom{\rule{0.16em}{0ex}}\mathrm{mol}\phantom{\rule{0.16em}{0ex}}%$ Te ($x=0$, 4, 6, and 9) composites were synthesized by solid-state reaction technique. Analysis of x-ray diffraction indicates not only impurity as a second phase but also doping via suppression inherent vacancies in the ${\mathrm{Sb}}_{2}{\mathrm{Te}}_{3}$ matrix. As result this change formation energy different...
Thermoelectric performance largely depends on the reduction of lattice thermal conductivity (κL). The study (κ) a Sb2Te3/graphite nanocomposite system demonstrates ∼40% in κL with graphite incorporation. A plausible explanation intrinsic low observed Sb2Te3 based is presented by modeling experimental specific heat (Cp) data. Raman spectroscopy measurement combined to X-Ray diffraction data confirms presence as separate phase composite sample. It found that phonon scattering dominates...
Abstract The elucidation of chemical bonding, coupled with an exploration the correlated dynamics constituent atoms, is essential for unravelling underlying mechanism responsible low lattice thermal conductivity (κ L ) exhibited by a crystalline solid, which thermoelectrics and barrier coatings. In this regard, Pauling's third empirical rule, deals cationic repulsion due to proximity in face or edge shared polyhedra crystal structure, can bring about instability required suppress κ . Here,...