Enhanced thermoelectric performance in p-type polycrystalline SnSe benefiting from texture modulation

Fu, Yue; Xu, Jingtao; Liu, Guoqiang; Yang, Jingkai; Tan, Xiaojian; Li, Zhu; H, Qin; Shao, Hezhu; Jiang, Haochuan; Liang, Bo; Jiang, Jun

doi:10.1039/c5tc03652f

Cited by 130 publications

(94 citation statements)

References 35 publications

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“…The highest reported ZT for polycrystalline SnSe is only 1.1, which is less than half of the undoped SC. 15,16 Even though alloying and microstructure modulation have been used to reduce thermal conductivity, polycrystalline samples exhibit a higher κ than the SC, [15][16][17][18][19][20] which contradicts phonon scattering considering the effect of grain boundary scattering. In addition, most polycrystalline samples possess lower power factors (S 2 σ) than the SC, which suggests that the control of crystallite orientation is very important in polycrystalline SnSe samples.…”

Section: Introductionmentioning

confidence: 99%

“…According to previous studies, 15 the hot pressed samples were cut perpendicular to the pressing direction, and the zone-melt sample was cut along the growing direction. For electrical measurements, the samples were cut into 8 mm × 2 mm × 2 mm bars.…”

Section: Methodsmentioning

confidence: 99%

“…The powders were loaded into a graphite mold with a 12.7-mm diameter and sintered under a pressure of 60 MPa for 30 min at 753 K. For ZM, the quartz tubes after rocking were put into a ZM furnace, and the crystals were grown at 1223 K with a constant speed of 10.66 mm h − 1 . 15 X-ray diffraction (XRD) analysis was performed in a reflection geometry using a diffractometer (D8 Advance, Bruker, Kalsruhe, Germany). The analysis was performed on the samples that were parallel/perpendicular to the applied pressure or growth direction.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, most polycrystalline samples possess lower power factors (S 2 σ) than the SC, which suggests that the control of crystallite orientation is very important in polycrystalline SnSe samples. [15][16][17][18][19][20] The undoped SnSe shows a carrier concentration of~10 17 cm − 3 , 11 which is considerably lower than the optimal region for a thermoelectric material. [2][3][4] Therefore, chemical doping has been used to tune the carrier concentration and improve the thermoelectric performance of SnSe.…”

Section: Introductionmentioning

confidence: 99%

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Texturing degree boosts thermoelectric performance of silver-doped polycrystalline SnSe

Wang

Liu

et al. 2017

NPG Asia Mater

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Tin selenite (SnSe) has attracted significant attention due to its record thermoelectric figure of merit (ZT = 2.6 at 923 K) of its single crystal. However, the polycrystalline SnSe processes considerably less ZTs (⩽1.1). In this study, we investigate the thermoelectric properties of Ag-doped polycrystalline SnSe, which was synthesized via zone melting and hot pressing. By comparing our results and previous reports of Ag-doped single crystals and polycrystals, we determine that the high texturing degree is essential for achieving good thermoelectric performance in polycrystalline SnSe. The zone-melted Sn 0.99 Ag 0.02 Se shows better thermoelectric performance than the Ag-doped SnSe single crystal in the entire temperature range, exhibiting a peak ZT of 1.3 at 793 K.

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Section: Introductionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Texturing degree boosts thermoelectric performance of silver-doped polycrystalline SnSe

Wang

Liu

et al. 2017

NPG Asia Mater

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“…[16][17][18][19][20][21][22][23][24] Sassi et al synthesized polycrystalline SnSe in quartz tubes and then densified by spark plasma sintering (SPS) and showed a peak ZT value of 0.5 at 823 K. [16] Li et al achieved a ZT of 0.58 at 773 K in textured SnSe polycrystals fabricated by the solvothermal synthesis (SS) followed by SPS. [21] Shi et al used the same technique but self-doped (SD) with Se to achieve a higher ZT of 1.36 ± 0.12 at 823 K. [17] Wei et al achieved a ZT of 0.8 at 800 K in polycrystalline SnSe with Na doping by using a combination of melting (M) and SPS.…”

Section: Thermoelectricsmentioning

confidence: 99%

Thin Film Tin Selenide (SnSe) Thermoelectric Generators Exhibiting Ultralow Thermal Conductivity

et al. 2018

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Tin selenide (SnSe) has attracted much attention in the field of thermoelectrics since the discovery of the record figure of merit (ZT) of 2.6 ± 0.3 along the b‐axis of the material. The record ZT is attributed to an ultralow thermal conductivity that arises from anharmonicity in bonding. While it is known that nanostructuring offers the prospect of enhanced thermoelectric performance, there have been minimal studies in the literature to date of the thermoelectric performance of thin films of SnSe. In this work, preferentially orientated porous networks of thin film SnSe nanosheets are fabricated using a simple thermal evaporation method, which exhibits an unprecedentedly low thermal conductivity of 0.08 W m−1 K−1 between 375 and 450 K. In addition, the first known example of a working SnSe thermoelectric generator is presented and characterized.

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Thermoelectric Materials

Owens‐Baird

Heinrich

Kovnir

2017

Encyclopedia of Inorganic and Bioinorganic Chemistry

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The field of thermoelectric materials has flourished over the last two decades. Significant successes achieved in the development of materials notwithstanding, novel and highly efficient materials are in steep demand due to a wide range of potential and current applications, ranging from wearable electronics to space missions. The main challenge in the improvement of the thermoelectric figure of merit ( zT ) is to optimize the intertwined intrinsic charge and thermal transport properties. High electrical conductivity and thermopower, along with low thermal conductivity, need to be achieved simultaneously to excel the thermoelectric efficiency. In this review, the thermoelectric concepts, basics of transport properties, and strategies for zT optimization are discussed in the first section. In the following sections, the predominate structure types associated with high‐performance bulk thermoelectric materials are discussed in detail: Bi 2 Te 3 , PbTe, TAGS/LAST systems, SnSe, Cu 2− x Se, chalcopyrites, tetrahedrites, clathrates, skutterudites, zinc antimonides, Yb 14 MnSb 11 , Heusler and half‐Heusler intermetallics. The basic crystal structures, the possibilities for doping and substitutions to adjust charge carrier concentration and thermal conductivity, baseline thermoelectric properties, and strategies for efficiency improvement are considered for each structure type. Examples of recent work highlighting these strategies are briefly presented.

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Enhanced thermoelectric performance in p-type polycrystalline SnSe benefiting from texture modulation

Abstract: The power factor was significantly enhanced benefiting from texture modulation, resulting in a ZT of ∼1.0 in p-type polycrystalline SnSe.

Cited by 130 publications

References 35 publications

Texturing degree boosts thermoelectric performance of silver-doped polycrystalline SnSe

Texturing degree boosts thermoelectric performance of silver-doped polycrystalline SnSe

Thin Film Tin Selenide (SnSe) Thermoelectric Generators Exhibiting Ultralow Thermal Conductivity

Thermoelectric Materials

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