Bottom-up processing and low temperature transport properties of polycrystalline SnSe

Ge, Zhen‐Hua; Wei, Kaya; Lewis, H. W.; Martin, Joshua; Nolas, George S.

doi:10.1016/j.jssc.2015.01.004

Cited by 52 publications

(45 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The merit of HT and ST methods is that it does not need very high synthetic temperature (normally below 500 K) [81,118], but the synthesized products often have a high quality, which can show identical information of crystal structure. In particular,…”

Section: Bridgman Methodsmentioning

confidence: 99%

“…As discussed above, the ultralow κ of SnSe mainly derives from the layered crystal structure and strongly anharmonic bonding [117]. However, phonon scatterings also frequently occur at grain boundaries and lattice defects, such as point defects and dislocations [65,81,118,119], especially in polycrystalline materials. Phonon scattering effects have been used as powerful tools to strengthen the scattering of phonons during transportation, in turn further reduce κ l [31,48,[120][121][122][123][124].…”

Section: Phonon Scattering Effectmentioning

confidence: 99%

See 1 more Smart Citation

High-performance SnSe thermoelectric materials: Progress and future challenge

Chen

Zhao

Zou

2018

Progress in Materials Science

465

410

View full text Add to dashboard Cite

Thermoelectric materials offer an alternative opportunity to tackle the energy crisis and environmental problems by enabling the direct solid-state energy conversion. As a promising candidate with full potentials for the next generation thermoelectrics, tin selenide (SnSe) and its associated thermoelectric materials have been attracted extensive attentions due to their ultralow thermal conductivity and high electrical transport performance (power factor). To provide a thorough overview of recent advances in SnSe-based thermoelectric materials that have been revealed as promising thermoelectric materials since 2014, here, we first focus on the inherent relationship between the structural characteristics and the supreme thermoelectric performance of SnSe, including the thermodynamics, crystal structures, and electronic structures. The effects of phonon scattering, pressure or strain, and oxidation behavior on the thermoelectric performance of SnSe are discussed in detail. Besides, we summarize the current theoretical calculations to predict and understand the thermoelectric performance of SnSe, and provide a comprehensive summary on the current synthesis, characterization, and thermoelectric performance of both SnSe crystals and polycrystals, and their associated materials. In the end, we point out the controversies, challenges and strategies toward future enhancements of the SnSe thermoelectric materials.

show abstract

Section: Bridgman Methodsmentioning

confidence: 99%

Section: Phonon Scattering Effectmentioning

confidence: 99%

High-performance SnSe thermoelectric materials: Progress and future challenge

Chen

Zhao

Zou

2018

Progress in Materials Science

465

410

View full text Add to dashboard Cite

show abstract

“…Table 2 provides a comprehensive overview on the synthesis of polycrystalline SnSe through solution‐based route applied to thermoelectrics, including product type, solvent type, Sn source, Se source, dopant and/or inclusion source, surfactant and/or catalyst, pH adjuster, synthesis temperature (K), synthesis time (h), sintering method, sinter pressure (MPa), sinter temperature (K), and sinter time (min), respectively. It is clear that water and EG are the two of the most frequently used solvents, and hydrazine with its hydrate compound are often used to accelerate the chemical reactions during synthesis 88,89. NaBH 4 can be used as subsolvent to dissolve Se when Se is chosen as Se source,190 and PVP and/or ethylenediaminetetraacetic acid (EDTA) are occasionally used as surfactant to ensure a high degree of crystallization in SnSe 93,257.…”

Section: Fundamentalmentioning

confidence: 99%

High‐Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges

2020

View full text Add to dashboard Cite

Tin selenide (SnSe) is one of the most promising candidates to realize environmentally friendly, cost‐effective, and high‐performance thermoelectrics, derived from its outstanding electrical transport properties by appropriate bandgaps and intrinsic low lattice thermal conductivity from its anharmonic layered structure. Advanced aqueous synthesis possesses various unique advantages including convenient morphology control, exceptional high doping solubility, and distinctive vacancy engineering. Considering that there is an urgent demand for a comprehensive survey on the aqueous synthesis technique applied to thermoelectric SnSe, herein, a thorough overview of aqueous synthesis, characterization, and thermoelectric performance in SnSe is provided. New insights into the aqueous synthesis‐based strategies for improving the performance are provided, including vacancy synergy, crystallization design, solubility breakthrough, and local lattice imperfection engineering, and an attempt to build the inherent links between the aqueous synthesis‐induced structural characteristics and the excellent thermoelectric performance is presented. Furthermore, the significant advantages and potentials of an aqueous synthesis route for fabricating SnSe‐based 2D thermoelectric generators, including nanorods, nanobelts, and nanosheets, are also discussed. Finally, the controversy, strategy, and outlook toward future enhancement of SnSe‐based thermoelectric materials are also provided. This Review guides the design of thermoelectric SnSe with high performance and provides new perspectives as a reference for other thermoelectric systems.

show abstract

“…This phase transition has been the subject of a number of early crystallographic and thermomechanical experimental investigations [22][23][24][25][26][27][28][29][30][31]. More recently, the ultra-low lattice thermal conductivity of SnSe has attracted great interest for thermoelectric applications, and has been studied both experimentally and through ab-initio simulations [10,[18][19][20][32][33][34][35][36][37][38][39][40][41][42]. The coupling between lattice distortion and electronic structure was recently shown to be responsible for the large anharmonicity, which persists in a broad range of temperatures, and leads to the low thermal conductivity [10,17].…”

Section: Introductionmentioning

confidence: 99%

Phonon anharmonicity and negative thermal expansion in SnSe

et al. 2016

View full text Add to dashboard Cite

The anharmonic phonon properties of SnSe in the Pnma phase were investigated with a combination of experiments and first-principles simulations. Using inelastic neutron scattering (INS) and nuclear resonant inelastic X-ray scattering (NRIXS), we have measured the phonon dispersions and density of states (DOS) and their temperature dependence, which revealed a strong, inhomogeneous shift and broadening of the spectrum on warming. First-principles simulations were performed to rationalize these measurements, and to explain the previously reported anisotropic thermal expansion, in particular the negative thermal expansion within the Sn-Se bilayers. Accurate treatment of the phonon free energy, in addition to the electronic ground state energy, is essential to reproduce the negative thermal expansion. From the phonon DOS obtained with INS and additional calorimetry measurements, we quantify the harmonic, dilational, and anharmonic components of the phonon entropy, heat capacity, and free energy. The origin of the anharmonic phonon thermodynamics is linked to the electronic structure.

show abstract

Bottom-up processing and low temperature transport properties of polycrystalline SnSe

Cited by 52 publications

References 16 publications

High-performance SnSe thermoelectric materials: Progress and future challenge

High-performance SnSe thermoelectric materials: Progress and future challenge

High‐Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges

Phonon anharmonicity and negative thermal expansion in SnSe

Contact Info

Product

Resources

About