Investigating the thermoelectric performance of n-type SnSe: the synergistic effect of NbCl<sub>5</sub> doping and dislocation engineering

Cai, Jianfeng; Zhang, Yan; Yin, Yinong; Tan, Xiaojian; Duan, Sichen; Liu, Guoqiang; Hu, Haoyang; Xiao, Yukun; Ge, Zhen‐Hua; Jiang, Jun

doi:10.1039/d0tc02959a

Cited by 39 publications

(33 citation statements)

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“…[4] We have observed that the intensity of (400) plane is stronger than (111) for all the powdered samples of SnSe 0.92 + x% MoCl 5 indicating the preferential orientation of the crystallites is along [h00] direction. [17,27,29,44] The XRD patterns of SPS'ed SnSe 0.92 + 1% MoCl 5 (x = 0, 1) recorded for both the parallel (||) and perpendicular (⊥) to the SPS direction (see Figure S4, Supporting Information) show a significant change in the relative intensities of (111) and (400) peaks inferring the presence of high degree of anisotropy in the SPS processed samples. We have observed that the relative intensities of (h00) peaks are stronger along the (||) than that along the (⊥) direction.…”

Section: Resultsmentioning

confidence: 99%

“…It is the dimensionless thermoelectric figure of merit (zT) that determines the performance of a thermoelectric material and is concentration of polycrystalline SnSe. [22][23][24][25][26][27] Besides, a couple of thermoelectric studies have also shown moderate zT values (far below the zT's of n-type single crystal) in n-type polycrystalline SnSe via Re doping and band-gap engineering. [28,29] As thermoelectric module demands both high performance p-and n-type similar materials, there remains plenty of room to enhance the zT to 2 for the n-type SnSe polycrystals by applying innovative and new strategies.…”

Section: Introductionmentioning

confidence: 99%

“…The vertical bars denote the standard error in the zT measurement. b) A comparison of zT of the present n-type SnSe polycrystalline sample with few other n-type SnSe polycrystals [22][23][24][26][27][28][29]42].…”

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Modular Nanostructures Facilitate Low Thermal Conductivity and Ultra‐High Thermoelectric Performance in n‐Type SnSe

et al. 2022

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Single crystals of SnSe have gained considerable attention in thermoelectrics due to their unprecedented thermoelectric performance. However, polycrystalline SnSe is more favorable for practical applications due to its facile chemical synthesis procedure, processability, and scalability. Though the thermoelectric figure of merit (zT) of p‐type bulk SnSe polycrystals has reached >2.5, zT of n‐type counterpart is still lower and lies around ≈1.5. Herein, record high zT of 2.0 in n‐type polycrystalline SnSe0.92 + x mol% MoCl5 (x = 0–3) samples is reported, when measured parallel to the spark plasma sintering pressing direction due to the simultaneous optimization of n‐type carrier concentration and enhanced phonon scattering by incorporating modular nano‐heterostructures in SnSe matrix. Modular nanostructures of layered intergrowth [(SnSe)1.05]m(MoSe2)n like compounds embedded in SnSe matrix scatters the phonons significantly leading to an ultra‐low lattice thermal conductivity (κlat) of ≈0.26 W m−1 K−1 at 798 K in SnSe0.92 + 3 mol% MoCl5. The 2D layered modular intergrowth compound resembles the nano‐heterostructure and their periodicity of 1.2–2.6 nm in the SnSe matrix matches the phonon mean free path of SnSe, thereby blocking the heat carrying phonons, which result in low κlat and ultra‐high thermoelectric performance in n‐type SnSe.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modular Nanostructures Facilitate Low Thermal Conductivity and Ultra‐High Thermoelectric Performance in n‐Type SnSe

et al. 2022

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“…With the AgBiSe 2 addition, the hardness is greatly enhanced by 42% to reach 0.75 ± 0.05 GPa in the x = 0.3 composite. The improvement in hardness may result from two aspects: (i) some Ag + ions enter into the interlayer of BiSbTe and form chemical bonds and (ii) increased impedance against dislocation movements by the emerged defect . As summarized in Figure , the BiSbTe-0.3% AgBiSe 2 sintered composite not only possesses an improved ZT value but also exhibits a higher Vickers hardness than the commercial ZM material.…”

Section: Resultsmentioning

confidence: 99%

Improved Thermoelectric Properties of BiSbTe-AgBiSe₂ Alloys by Suppressing Bipolar Excitation

Shi

Wang

Zhang

et al. 2021

ACS Appl. Energy Mater.

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Bismuth telluride alloys are the only commercialized thermoelectric materials, which have successfully realized the practical applications of active cooling and waste heat harvesting near room temperature. However, the drawbacks of intermediate ZT values and brittle nature of zone-melted materials have limited their future development. Herein, we show that AgBiSe2 alloying is an effective approach to improve both the thermoelectric and mechanical performance of sintered Bi0.48Sb1.52Te3 materials. The addition of AgBiSe2 can not only suppress the bipolar effect by increasing the hole concentration but also decrease the lattice thermal conductivity by introducing various phonon scattering centers. These effects enable a peak ZT value of 1.1 at 375 K and an average value of 0.94 between 300 and 500 K in the composite of Bi0.48Sb1.52Te3-0.3 wt % AgBiSe2. Moreover, the addition of AgBiSe2 can also enhance the Vickers hardness, which reaches 0.75 GPa, 42% times higher than that of pristine zone-melted BiSbTe.

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“…A plethora of research has focused on enhancing the thermoelectric performance of polycrystalline SnSe, beyond removal of the surface oxide layer. Approaches include controlling carriers by doping with various alkali (Na, K, and Li) − and transition metal (Ag, Nb, and Re) − cations, hot deformation techniques to promote texturation, alloying with AgSbSe 2 and AgBiSe 2 to promote crystal and electronic structural modulation, and introducing nanofeatures in the SnSe matrix.…”

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confidence: 99%

High-Performance Thermoelectrics Based on Solution-Grown SnSe Nanostructures

2021

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Two-dimensional layered tin selenide (SnSe) has attracted immense interest in thermoelectrics due to its ultralow lattice thermal conductivity and high thermoelectric performance. To date, the majority of thermoelectric studies of SnSe have been based on single crystals. However, because synthesizing SnSe single crystals is an expensive, time-consuming process that requires high temperatures and because SnSe single crystals have relatively weaker mechanical stability, they are not favorable for scaling up synthesis, commercialization, or practical applications. As a result, research on nanocrystalline SnSe that can be produced in large quantities by simple and low-temperature solution-phase synthesis is needed. In this Perspective, we discuss the progress in thermoelectric properties of SnSe with a particular emphasis on nanocrystalline SnSe, which is grown in solution. We first describe the state-of-the-art high-performance single crystal and polycrystals of SnSe and their importance and drawbacks and discuss how nanocrystalline SnSe can solve some of these challenges. We illustrate different solution-phase synthesis procedures to produce various SnSe nanostructures and discuss their thermoelectric properties. We also highlight a unique solution-phase synthesis technique to prepare CdSe-coated SnSe nanocomposites and its unprecedented thermoelectric figure of merit (ZT) of 2.2 at 786 K, as reported in this issue of ACS Nano. In general, solution synthesis showed excellent control over nanoscale grain growth, and nanocrystalline SnSe shows ultralow thermal conductivity due to strong phonon scattering by the nanoscale grain boundaries. Finally, we offer insight into the opportunities and challenges associated with nanocrystalline SnSe synthesized by the solution route and its future in thermoelectric energy conversion.

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Investigating the thermoelectric performance of n-type SnSe: the synergistic effect of NbCl₅ doping and dislocation engineering

Abstract: Tin selenide (SnSe) is a promising thermoelectric material because of its advantageous electronic structures and low thermal conductivity. In this work, n-type polycrystalline SnSe0.95 doped by a new dopant NbCl5...

Cited by 39 publications

References 51 publications

Modular Nanostructures Facilitate Low Thermal Conductivity and Ultra‐High Thermoelectric Performance in n‐Type SnSe

Modular Nanostructures Facilitate Low Thermal Conductivity and Ultra‐High Thermoelectric Performance in n‐Type SnSe

Improved Thermoelectric Properties of BiSbTe-AgBiSe₂ Alloys by Suppressing Bipolar Excitation

High-Performance Thermoelectrics Based on Solution-Grown SnSe Nanostructures

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Investigating the thermoelectric performance of n-type SnSe: the synergistic effect of NbCl5 doping and dislocation engineering

Abstract: Tin selenide (SnSe) is a promising thermoelectric material because of its advantageous electronic structures and low thermal conductivity. In this work, n-type polycrystalline SnSe0.95 doped by a new dopant NbCl5...

Cited by 39 publications

References 51 publications

Modular Nanostructures Facilitate Low Thermal Conductivity and Ultra‐High Thermoelectric Performance in n‐Type SnSe

Modular Nanostructures Facilitate Low Thermal Conductivity and Ultra‐High Thermoelectric Performance in n‐Type SnSe

Improved Thermoelectric Properties of BiSbTe-AgBiSe2 Alloys by Suppressing Bipolar Excitation

High-Performance Thermoelectrics Based on Solution-Grown SnSe Nanostructures

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Investigating the thermoelectric performance of n-type SnSe: the synergistic effect of NbCl₅ doping and dislocation engineering

Improved Thermoelectric Properties of BiSbTe-AgBiSe₂ Alloys by Suppressing Bipolar Excitation