Probing an enhanced anisotropy Seebeck coefficient and low thermal conductivity in polycrystalline Al doped SnSe nanostructure

Athithya, S.; Jibri, K P Mohamed; Harish, S.; Hayakawa, Kunio; Kubota, Yoshihiro; Ikeda, Hiroaki; Hayakawa, Y.; Navaneethan, M.; Archana, J.

doi:10.1063/5.0134959

Cited by 7 publications

(7 citation statements)

References 66 publications

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“…It is therefore crucial to maintain the Bi 2 S 3 content below 1% to achieve an optimal thermoelectric performance in Ag 2 Se–Bi 2 S 3 composites. Notice that a similar evolution of the Seebeck coefficient with dopant concentration, first increasing and later decreasing at higher dopant concentrations, has been reported in other systems, and diverse mechanisms have been reported. − Besides, previous studies have also shown increased Seebeck coefficients without affecting the electrical conductivity. − The preserved electrical conductivity of Ag 2 Se after being mixed with Bi 2 S 3 is attributed to the notable increase in charge carrier mobility, which compensates for the moderate decrease in charge carrier concentration.…”

Section: Results and Discussionsupporting

confidence: 60%

Engineering of Thermoelectric Composites Based on Silver Selenide in Aqueous Solution and Ambient Temperature

Nan

Zhang

et al. 2023

ACS Appl. Electron. Mater.

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The direct, solid state, and reversible conversion between heat and electricity using thermoelectric devices finds numerous potential uses, especially around room temperature. However, the relatively high material processing cost limits their real applications. Silver selenide (Ag 2 Se) is one of the very few n-type thermoelectric (TE) materials for room-temperature applications. Herein, we report a room temperature, fast, and aqueous-phase synthesis approach to produce Ag 2 Se, which can be extended to other metal chalcogenides. These materials reach TE figures of merit (zT) of up to 0.76 at 380 K. To improve these values, bismuth sulfide (Bi 2 S 3 ) particles also prepared in an aqueous solution are incorporated into the Ag 2 Se matrix. In this way, a series of Ag 2 Se/Bi 2 S 3 composites with Bi 2 S 3 wt % of 0.5, 1.0, and 1.5 are prepared by solution blending and hot-press sintering. The presence of Bi 2 S 3 significantly improves the Seebeck coefficient and power factor while at the same time decreasing the thermal conductivity with no apparent drop in electrical conductivity. Thus, a maximum zT value of 0.96 is achieved in the composites with 1.0 wt % Bi 2 S 3 at 370 K. Furthermore, a high average zT value (zT ave ) of 0.93 in the 300−390 K range is demonstrated.

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Section: Results and Discussionsupporting

confidence: 60%

Engineering of Thermoelectric Composites Based on Silver Selenide in Aqueous Solution and Ambient Temperature

Nan

Zhang

et al. 2023

ACS Appl. Electron. Mater.

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“…29 After deconvolution, the binding energies of the Se 3d 5/2 and Se 3d 3/2 peaks are reported to be 53.7 and 54.7 eV, respectively. 30 Therefore, this result suggests the presence of Se 2− in the SnS 0.9 Se 0.1 :Ag pellet.…”

Section: ■ Introductionmentioning

confidence: 74%

Electronic and Thermal Transport Properties of Nanostructured Thermoelectric Materials Sintered from Chemically Synthesized Tin Sulfide Nanoparticles and Effects of Ag and Se Doping

Kobayashi,

Takahashi,

Moore

et al. 2024

ACS Appl. Energy Mater.

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To shine light on the mechanisms involved in the doping of the sustainable thermoelectric material SnS with Ag and Se, we present a detailed investigation into Ag-and Se-doped SnS nanoparticles (NPs). SnS NPs, Ag-doped SnS NPs, and Ag-doped SnS 1−x Se x NPs were chemically synthesized and sintered into pellets by hot-press. The structure and thermoelectric, electronic, and thermal transport properties were then investigated using a variety of techniques. As a result, it was found that when Ag-doped SnS NPs were sintered two types of Ag were present in the sintered pellets: one in the form of segregated Ag-rich nanoprecipitates and the other in the form of interlayer intercalated Ag ions. In contrast, when Ag-doped SnS 1−x Se x NPs were sintered, Se was found to form a homogeneous solid solution. The effects of these three impurity-derived structures on the electronic and thermal transport properties were investigated. The final ZT values for SnS doped with 1.5 at% Ag (SnS:Ag) and SnS 0.9 Se 0.1 :Ag, in which SnS:Ag was further doped with Se, were 0.09 at 666 K and 0.14 at 667 K, respectively.

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“…The shift in the peak was caused by a change in bond length between Sn and Se after Zn doping, which resulted in a change in the equilibrium of nuclear geometry between the system's ground state and final ionized state. 44 The BE in Se 3d corelevel spectra (Figure 3b) of green pellets and pellets sintered at 200 °C is at 54.9 and 54.17 eV. These peaks correspond to SnSe 1+x and SnSe.…”

Section: Resultsmentioning

confidence: 96%

“…A slight shift toward the lower BE in the Sn 3d 5/2 orbital in Zn-doped pellets shows the substitution of Sn by Zn atoms. The shift in the peak was caused by a change in bond length between Sn and Se after Zn doping, which resulted in a change in the equilibrium of nuclear geometry between the system’s ground state and final ionized state . The BE in Se 3d core-level spectra (Figure b) of green pellets and pellets sintered at 200 °C is at 54.9 and 54.17 eV.…”

Section: Results and Discussionmentioning

confidence: 99%

Facile Synthesis and Enhancement of Thermoelectric Performance with Voltage Generation of Bulk Polycrystalline SnSe by Zn Doping

Singh,

Roy,

Gahtori

et al. 2023

ACS Appl. Eng. Mater.

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Researchers are focused on developing an efficient and eco-friendly thermoelectric material, which has increased interest in tin selenide (SnSe). This study optimizes the sintering temperature (T s) for polycrystalline SnSe fabrication through a powder metallurgy process. It also explores the potential benefits of using Zn as a nontoxic dopant to enhance its thermoelectric properties. The detailed analyses of the data generated from XRD, SEM, EDS, Raman spectroscopy, XPS, high-resolution TEM (HRTEM), and thermoelectric properties measurement techniques were used to optimize the sintering temperature and understand the impact of doping concentration for polycrystalline SnSe. The optimized T s for SnSe was 600 °C on the basis of phase formation and the highest ZT value (∼0.55 at 772 K). A transition from n-type to p-type in the Seebeck coefficient data at T s < 600 °C was observed because of the dominant effect of tin oxide over SnSe, which was suppressed with the formation of SnSe with increasing measured temperatures. The addition of Zn to SnSe led to a boost in its ZT value by curbing thermal conductivity through the creation of a ZnSe second phase in Sn0.95Zn0.05Se, which resulted in an impressive ZT value of 1.05 at 783 K. The obtained ZT value, i.e., 1.05 at 783 K, is 91% higher than the undoped polycrystalline SnSe and found to be the maximum among the reported ZT values for Zn-doped SnSe (bulk, polycrystalline). The maximum voltage (∼241.5 mV at 425 °C) generated from the Zn (0.05)-doped SnSe was 57% more than that generated from the undoped SnSe.

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Probing an enhanced anisotropy Seebeck coefficient and low thermal conductivity in polycrystalline Al doped SnSe nanostructure

Cited by 7 publications

References 66 publications

Engineering of Thermoelectric Composites Based on Silver Selenide in Aqueous Solution and Ambient Temperature

Engineering of Thermoelectric Composites Based on Silver Selenide in Aqueous Solution and Ambient Temperature

Electronic and Thermal Transport Properties of Nanostructured Thermoelectric Materials Sintered from Chemically Synthesized Tin Sulfide Nanoparticles and Effects of Ag and Se Doping

Facile Synthesis and Enhancement of Thermoelectric Performance with Voltage Generation of Bulk Polycrystalline SnSe by Zn Doping

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