A5100320240- Advanced Thermoelectric Materials and Devices
- Chalcogenide Semiconductor Thin Films
- Thermal properties of materials
- Thermal Radiation and Cooling Technologies
- Heusler alloys: electronic and magnetic properties
- Thermal Expansion and Ionic Conductivity
- 2D Materials and Applications
- Perovskite Materials and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Quantum Dots Synthesis And Properties
- Phase-change materials and chalcogenides
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Semiconductor materials and interfaces
- Advancements in Battery Materials
- Perfectionism, Procrastination, Anxiety Studies
- Optical properties and cooling technologies in crystalline materials
- Magnetic and transport properties of perovskites and related materials
- Web Data Mining and Analysis
- Railway Systems and Energy Efficiency
- Advanced Text Analysis Techniques
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- Acne and Rosacea Treatments and Effects
Tongji University
2015-2024
Hubei University of Technology
2024
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
2024
Jilin University
2024
Northwest A&F University
2022
State Key Laboratory of Pollution Control and Resource Reuse
2022
Shanghai Tenth People's Hospital
2018
Shanghai Medical College of Fudan University
2013
Yangpu Hospital of Tongji University
2013
Christie's
2013
Phonon scattering by nanostructures and point defects has become the primary strategy for minimizing lattice thermal conductivity (κL ) in thermoelectric materials. However, these scatterers are only effective at extremes of phonon spectrum. Recently, it been demonstrated that dislocations remaining mid-frequency phonons as well. In this work, varying concentration Na Pb0.97 Eu0.03 Te, determined dominant microstructural features defects, dislocations, nanostructure interfaces. This study...
Abstract High-efficiency thermoelectric materials require a high conductivity. It is known that large number of degenerate band valleys offers many conducting channels for improving the conductivity without detrimental effects on other properties explicitly, and therefore, increases performance. In addition to strategy converging different bands, semiconductors provide an inherent nestification, equally enabling effective valley degeneracy. Here we show as example simple elemental...
Abstract To minimize the lattice thermal conductivity in thermoelectrics, strategies typically focus on scattering of low-frequency phonons by interfaces and high-frequency point defects. In addition, mid-frequency dense dislocations, localized at grain boundaries, has been shown to reduce improve thermoelectric performance. Here we propose a vacancy engineering strategy create dislocations grains. Pb 1− x Sb 2 /3 Se solid solutions, cation vacancies are intentionally introduced, where after...
Compared to commercially available p‐type PbTe thermoelectrics, SnTe has a much bigger band offset between its two valence bands and higher lattice thermal conductivity, both of which limit peak thermoelectric figure merit, zT only 0.4. Converging or introducing resonant states is found enhance the electronic properties, while nanostructuring more recently interstitial defects reduce conductivity. Even with an integration some strategies above, existing efforts do not enable exceeding 1.4...
Due to point defect phonon scattering, formation of solid solutions has long been considered as an effective approach for enhancing thermoelectric performance through reducing the lattice thermal conductivity. The scattering phonons by defects mainly comes from mass and strain fluctuations between guest host atoms. Both can be maximized interstitial atoms and/or vacancies in a crystal. Here, demonstration Cu is shown, leading extremely low conductivity 0.5 W m −1 K SnTe‐Cu 2 Te solutions....
Conventional strategies for advancing thermoelectrics by minimizing the lattice thermal conductivity focus on phonon scattering a short mean free path. Here, design of slow propagation as an effective approach high‐performance is shown. Taking Ag 8 SnSe 6 example, which shows one lowest sound velocities among known thermoelectric semiconductors, found to be low 0.2 W m −1 K in entire temperature range. As result, peak figure merit zT > 1.2 and average high ≈0.8 are achieved Nb‐doped...
The thermoelectric figure of merit zT SnTe, an analogue to PbTe, has long been known be about 0.6, mainly due its single band transport behavior. Similar what found in alloying with group II monotellurides such as CdTe, HgTe, MgTe enables a reduced energy separation between the two valence bands leading converged for significantly increased ∼1.1 demonstrated further improvements by other independent strategies nanostructuring. Here we show highly soluble MnTe not only tunes structure but...
Abstract Many efforts are recently devoted on improving thermoelectric SnTe as an environment—friendly alternative to conventional PbTe and successful approaches include valence band convergence, nanostructuring, substantial/interstitial defects. Among these strategies, alloying with MnTe enables the most effective reduction in offset (between L Σ ) for a convergence due its high solubility of ≈15%, yet there is no indication that enough fully optimizing structure thus maximizing electronic...
Low-grade heat accounts for >50% of the total dissipated sources in industries. An efficient recovery low-grade into useful electricity not only reduces consumption fossil-fuels but also releases subsequential environmental-crisis. Thermoelectricity offers an ideal solution, yet low-temperature materials have continuously been limited to Bi2Te3-alloys since discovery 1950s. Scarcity tellurium and strong property anisotropy cause high-cost both raw-materials synthesis/processing. Here we...
Advancing thermoelectric n-type Mg3 Sb2 alloys requires both high carrier concentration offered by effective doping and mobility enabled large grains. Existing research usually involves chalcogen on the anion sites, resultant reaches ≈3 × 1019 cm-3 or below. This is much lower than optimum theoretically predicted, which suggets that further improvements will be possible once a highly efficient dopant found. Yttrium, trivalent dopant, shown to enable concentrations up above ≈1 1020 when it...
This work demonstrates GeTe alloys for efficient thermoelectric waste-heat recovery.
Tin sulfide (SnS), a low-cost compound from the IV–VI semiconductors, has attracted particular attention due to its great potential for large-scale thermoelectric applications. However, pristine SnS shows low carrier concentration, which leads performance. In this work, sodium is utilized substitute Sn increase hole concentration and consequently improve power factor. The resultant Hall up ∼1019 cm–3 highest reported so far compound. This further figure of merit, zT 0.65, in polycrystalline...
Phonon scattering by point defects has been proven as an effective strategy for thermoelectric performance enhancements through reducing lattice thermal conductivity. This type of largely relies on the mass and strain fluctuations between host guest atoms, both which can be maximized vacancies demonstrated in a few solid solutions showing significant reduction Here we show Cu2SnSe4, new compound with intrinsic cation site, promising material due to low conductivity 0.6 W m–1 K–1...
SnTe, as a top Pb-free alternative to PbTe, attracts extensive attention for thermoelectric applications. For performance enhancement, successful electronic strategies are typified by band convergence and resonant doping, while effective thermal include nanostructuring and, recently, interstitial defects. This work demonstrates that phonon scattering defects, nearly immune strategy integratable convergence, independently reduces the lattice conductivity amorphous limit. leads zT high 1.4 in...
Abstract Recent discoveries of novel thermoelectric materials largely rely on an intrinsic low lattice thermal conductivity. This results from various mechanisms including sound velocity, complex crystal structure, liquid‐like ions, and anharmonicity. Here semiconducting Ag 9 AlSe 6 with many weakly bonded highly disordered cations is shown to be a promising material, due its ultralow conductivity (κ L ) ≈0.3 W m −1 K in the entire temperature range. Such κ believed result (1) structure for...
Vacancies scatter phonons more effectively than substitutional defects, leading to a stronger reduction in the lattice thermal conductivity of thermoelectric CuGaTe<sub>2</sub>.
In-grain dislocation-induced lattice strain fluctuations are recently revealed as an effective avenue for minimizing the thermal conductivity. This effect could be integratable with electronic enhancements such by band convergence, a great advancement in thermoelectric performance. motivates current work to focus on of p-type PbTe alloys, where monotelluride-alloying and Na-doping used simultaneous manipulation both dislocation structures. As confirmed synchrotron X-ray diffractions Raman...
Single parabolic band conduction not only explains but also evaluates the thermoelectric properties of p-type CuGaTe<sub>2</sub>.
Ag-substitution enables a 75% reduction in lattice thermal conductivity and therefore enhancement the thermoelectric figure of merit.