1
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Seshita A, Yamashita A, Katase T, Mizuguchi Y. High entropy effect on thermoelectric properties of the nonequilibrium cubic phase of AgBiSe 2-2xS xTe x with x = 0-0.6. Dalton Trans 2024. [PMID: 39171538 DOI: 10.1039/d4dt01317d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
Silver bismuth diselenide (AgBiSe2) has attracted much attention as an efficient thermoelectric material owing to its low thermal conductivity. However, AgBiSe2 exhibits multiple crystal structural transitions with temperature, and high thermoelectric performance was realized only in the high-temperature cubic phase. We previously reported the stabilization of the cubic phase in AgBiSe2-2xSxTex with x = 0.6-0.8 at room temperature using a high-entropy-alloy (HEA) approach. In this paper, we succeeded in stabilizing the cubic phase in AgBiSe2-2xSxTex with x = 0-0.6 using an ice-quenching method and investigated the HE effect on thermoelectric properties below room temperature to avoid the emergence of a hexagonal phase above room temperature. Cubic AgBiSe2-2xSxTex exhibited n-type conductivity at 10-300 K. The increase in electrical conductivity is due to a combined effect of increased charge density and electron mobility, depending on the sample. It is evident that charge carrier density strongly increases in the x = 0.4 sample while the mobility remains roughly the same compared to the x = 0.0 sample. In x = 0.2 and 0.6 samples, electronic conductivity increases primarily due to enhanced mobility. S and Te substitutions induced a variation in the band structure, resulting in carrier mobility enhancement. Furthermore, thermal conductivity showed reduction tendency with increasing amounts of S and Te due to the enhancement of phonon scattering. Simultaneous electronic conductivity increase and thermal conductivity reduction resulted in the systematic improvement of ZT values for HE-type cubic AgBiSe2-2xSxTex.
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Affiliation(s)
- Asato Seshita
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-shi, Tokyo 192-0397, Japan.
| | - Aichi Yamashita
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-shi, Tokyo 192-0397, Japan.
| | - Takayoshi Katase
- MDX Research Center for Element Strategy, International Research Frontiers Initiative, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8501, Japan
| | - Yoshikazu Mizuguchi
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-shi, Tokyo 192-0397, Japan.
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2
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Kim K, Choo S, Lee J, Ju H, Jung S, Jo S, Lee S, Baek S, Kim J, Kim KT, Chae HG, Son JS. Heat-Dissipation Design and 3D Printing of Ternary Silver Chalcogenide-Based Thermoelectric Legs for Enhancing Power Generation Performance. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2402934. [PMID: 38859618 PMCID: PMC11321642 DOI: 10.1002/advs.202402934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Revised: 05/14/2024] [Indexed: 06/12/2024]
Abstract
Thermoelectric devices have received significant attention because of their potential for sustainable energy recovery. In these devices, a thermal design that optimizes heat transfer and dissipation is crucial for maximizing the power output. Heat dissipation generally requires external active or passive cooling devices, which often suffer from inevitable heat loss and heavy systems. Herein, the design of heat-sink integrated thermoelectric legs is proposed to enhance heat dissipation without external cooling devices, realized by finite element model simulation and 3D printing of ternary silver chalcogenide-based thermoelectric materials. Owing to the self-induced surface charges of the synthesized AgBiSe2 (n-type) and AgSbTe2 (p-type) particles, these particle-based colloidal inks exhibited high viscoelasticity, which enables the creation of complex heat-dissipation architectures via 3D printing. Power generators made from 3D-printed heat-dissipating legs exhibit higher temperature differences and output power than traditional cuboids, offering a new strategy for enhancing thermoelectric power generation.
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Affiliation(s)
- Keonkuk Kim
- Department of Chemical EngineeringPohang University of Science and Technology (POSTECH)Pohang37673Republic of Korea
| | - Seungjun Choo
- Department of Chemical EngineeringPohang University of Science and Technology (POSTECH)Pohang37673Republic of Korea
| | - Jungsoo Lee
- Department of Chemical EngineeringPohang University of Science and Technology (POSTECH)Pohang37673Republic of Korea
| | - Hyejin Ju
- Department of Materials Science and EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Soo‐ho Jung
- Department of 3D Printing MaterialsKorea Institute of Materials Science (KIMS)Changwon51508Republic of Korea
| | - Seungki Jo
- Department of 3D Printing MaterialsKorea Institute of Materials Science (KIMS)Changwon51508Republic of Korea
| | - So‐Hyeon Lee
- Department of Materials Science and EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Seongheon Baek
- Department of Materials Science and EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Ju‐Young Kim
- Department of Materials Science and EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Kyung Tae Kim
- Department of 3D Printing MaterialsKorea Institute of Materials Science (KIMS)Changwon51508Republic of Korea
| | - Han Gi Chae
- Department of Materials Science and EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
| | - Jae Sung Son
- Department of Chemical EngineeringPohang University of Science and Technology (POSTECH)Pohang37673Republic of Korea
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3
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Jang H, Jung YS, Oh MW. Advances in thermoelectric AgBiSe 2: Properties, strategies, and future challenges. Heliyon 2023; 9:e21117. [PMID: 37928035 PMCID: PMC10623285 DOI: 10.1016/j.heliyon.2023.e21117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 10/04/2023] [Accepted: 10/16/2023] [Indexed: 11/07/2023] Open
Abstract
Thermoelectric materials are attracting considerable attention to alleviate the global energy crisis by enabling the direct conversion of heat into electricity. As a class of I-V-VI2 semiconductors, AgBiSe2 is expected to be the potential thermoelectric material to replace conventional PbTe-based compounds due to its non-toxic and abundant nature of its constituent elements. This review article summarizes the fundamental properties of AgBiSe2, thermoelectric properties, the effect of different dopants on its transport properties and entropy engineering for cubic phase stabilization with the detailed description of related techniques used to analyze the properties of AgBiSe2. The current thermoelectric figure-of-merit and approaches to further improve performance and operational stability are also discussed.
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Affiliation(s)
- Hanhwi Jang
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Yeon Sik Jung
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Min-Wook Oh
- Department of Materials Science and Engineering, Hanbat National University, Yuseong-gu, Daejeon, 34158, Republic of Korea
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4
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Jang H, Toriyama MY, Abbey S, Frimpong B, Male JP, Snyder GJ, Jung YS, Oh MW. Suppressing Charged Cation Antisites via Se Vapor Annealing Enables p-Type Dopability in AgBiSe 2 -SnSe Thermoelectrics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2204132. [PMID: 35944565 DOI: 10.1002/adma.202204132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 07/02/2022] [Indexed: 06/15/2023]
Abstract
Cation disordering is commonly found in multinary cubic compounds, but its effect on electronic properties has been neglected because of difficulties in determining the ordered structure and defect energetics. An absence of rational understanding of the point defects present has led to poor reproducibility and uncontrolled conduction type. AgBiSe2 is a representative compound that suffers from poor reproducibility of thermoelectric properties, while the origins of its intrinsic n-type conductivity remain speculative. Here, it is demonstrated that cation disordering is facilitated by BiAg charged antisite defects in cubic AgBiSe2 which also act as a principal donor defect that greatly controls the electronic properties. Using density functional theory calculations and in situ Raman spectroscopy, how saturation annealing with selenium vapor can stabilize p-type conductivity in cubic AgBiSe2 alloyed with SnSe at high temperatures is elucidated. With stable and controlled hole concentration, a peak is observed in the weighted mobility and the density-of-states effective mass in AgBiSnSe3 , implying an increased valley degeneracy in this system. These findings corroborate the importance of considering the defect energetics for exploring the dopability of ternary thermoelectric chalcogenides and engineering electronic bands by controlling self-doping.
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Affiliation(s)
- Hanhwi Jang
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Michael Y Toriyama
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Stanley Abbey
- Department of Materials Science and Engineering, Hanbat National University, Yuseong-gu, Daejeon, 34158, Republic of Korea
| | - Brakowaa Frimpong
- Department of Materials Science and Engineering, Hanbat National University, Yuseong-gu, Daejeon, 34158, Republic of Korea
| | - James P Male
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - G Jeffrey Snyder
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Yeon Sik Jung
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Min-Wook Oh
- Department of Materials Science and Engineering, Hanbat National University, Yuseong-gu, Daejeon, 34158, Republic of Korea
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5
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Hasan S, San S, Baral K, Li N, Rulis P, Ching WY. First-Principles Calculations of Thermoelectric Transport Properties of Quaternary and Ternary Bulk Chalcogenide Crystals. MATERIALS 2022; 15:ma15082843. [PMID: 35454538 PMCID: PMC9032660 DOI: 10.3390/ma15082843] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 04/05/2022] [Accepted: 04/09/2022] [Indexed: 12/10/2022]
Abstract
Chalcogenide crystals have a wide range of applications, especially as thermoelectric materials for energy conversion. Thermoelectric materials can be used to generate an electric current from a temperature gradient based on the Seebeck effect and based on the Peltier effect, and they can be used in cooling applications. Using first-principles calculations and semiclassical Boltzmann theory, we have computed the Seebeck coefficient, electrical conductivity, electronic thermal conductivity, power factor, and figure of merit of 30 chalcogenide crystals. A Quantum Espresso package is used to calculate the electronic properties and locate the Fermi level. The transport properties are then calculated using the BoltzTraP code. The 30 crystals are divided into two groups. The first group has four crystals with quaternary composition (A2BCQ4) (A = Tl; B = Cd, Hg; C = Si, Ge, Sn; Q = S, Se, Te). The second group contains 26 crystals with the ternary composition (A’B’Q2) (A’ = Ag, Cu, Au, Na; B’ = B, Al, Ga, In; Q = S, Se, Te). Among these 30 chalcogenide crystals, the results for 11 crystals: Tl2CdGeSe4, Tl2CdSnSe4, Tl2HgSiSe4, Tl2HgSnS4, AuBSe2, AuBTe2, AuAlTe2, AuGaTe2, AuInTe2, AgAlSe2, and AgAlTe2 are revealed for the first time. In addition, temperature-dependent transport properties of pure and doped AgSbSe2 and AgSbTe2 crystals with dopant compositions of AgSb0.94Cd0.06Te2 and AgSbTe1.85Se0.15 were explored. These results provide an excellent database for bulk chalcogenides crucial for a wide range of potential applications in renewable energy fields.
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Affiliation(s)
- Sahib Hasan
- Department of Physics and Astronomy, University of Missouri-Kansas City, Kansas City, MO 64110, USA
- Department of Sciences, College of Basic Education, Al Muthanna University, Samawah 66001, Iraq
| | - Saro San
- Department of Physics and Astronomy, University of Missouri-Kansas City, Kansas City, MO 64110, USA
| | - Khagendra Baral
- Department of Physics and Astronomy, University of Missouri-Kansas City, Kansas City, MO 64110, USA
| | - Neng Li
- School of Materials Science and Engineering, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan 430070, China
| | - Paul Rulis
- Department of Physics and Astronomy, University of Missouri-Kansas City, Kansas City, MO 64110, USA
| | - Wai-Yim Ching
- Department of Physics and Astronomy, University of Missouri-Kansas City, Kansas City, MO 64110, USA
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6
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Li T, Luo S, Wang X, Zhang L. Alternative Lone-Pair ns 2 -Cation-Based Semiconductors beyond Lead Halide Perovskites for Optoelectronic Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2008574. [PMID: 34060151 DOI: 10.1002/adma.202008574] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Revised: 03/22/2021] [Indexed: 06/12/2023]
Abstract
Lead halide perovskites have emerged in the last decade as advantageous high-performance optoelectronic semiconductors, and have undergone rapid development for diverse applications such as solar cells, light-emitting diodes , and photodetectors. While material instability and lead toxicity are still major concerns hindering their commercialization, they offer promising prospects and design principles for developing promising optoelectronic materials. The distinguished optoelectronic properties of lead halide perovskites stem from the Pb2+ cation with a lone-pair 6s2 electronic configuration embedded in a mixed covalent-ionic bonding lattice. Herein, we summarize alternative Pb-free semiconductors containing lone-pair ns2 cations, intending to offer insights for developing potential optoelectronic materials other than lead halide perovskites. We start with the physical underpinning of how the ns2 cations within the material lattice allow for superior optoelectronic properties. We then review the emerging Pb-free semiconductors containing ns2 cations in terms of structural dimensionality, which is crucial for optoelectronic performance. For each category of materials, the research progresses on crystal structures, electronic/optical properties, device applications, and recent efforts for performance enhancements are overviewed. Finally, the issues hindering the further developments of studied materials are surveyed along with possible strategies to overcome them, which also provides an outlook on the future research in this field.
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Affiliation(s)
- Tianshu Li
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Automobile Materials of MOE, and School of Materials Science and Engineering, Jilin University, Changchun, 130012, China
| | - Shulin Luo
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Automobile Materials of MOE, and School of Materials Science and Engineering, Jilin University, Changchun, 130012, China
| | - Xinjiang Wang
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Automobile Materials of MOE, and School of Materials Science and Engineering, Jilin University, Changchun, 130012, China
| | - Lijun Zhang
- State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Automobile Materials of MOE, and School of Materials Science and Engineering, Jilin University, Changchun, 130012, China
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7
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Liu XC, Wang YM, Qi ML, Pan MY. Enhanced thermoelectric properties in Ag-rich AgSbSe2. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121454] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Morino K, Goto Y, Miura A, Moriyoshi C, Kuroiwa Y, Mizuguchi Y. Crystal Structure and Thermoelectric Transport Properties of As-Doped Layered Pnictogen Oxyselenides NdO 0.8F 0.2Sb 1-xAs xSe 2. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E2164. [PMID: 32392874 PMCID: PMC7254281 DOI: 10.3390/ma13092164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 04/27/2020] [Accepted: 05/04/2020] [Indexed: 11/21/2022]
Abstract
We report the synthesis and thermoelectric transport properties of As-doped layered pnictogen oxyselenides NdO0.8F0.2Sb1-xAsxSe2 (x ≤ 0.6), which are predicted to show high-performance thermoelectric properties based on first-principles calculation. The crystal structure of these compounds belongs to the tetragonal P4/nmm space group (No. 129) at room temperature. The lattice parameter c decreases with increasing x, while a remains almost unchanged among the samples. Despite isovalent substitution of As for Sb, electrical resistivity significantly rises with increasing x. Very low thermal conductivity of less than 0.8 Wm-1K-1 is observed at temperatures between 300 and 673 K for all the examined samples. For As-doped samples, the thermal conductivity further decreases above 600 K. Temperature-dependent synchrotron X-ray diffraction indicates that an anomaly also occurs in the c-axis length at around 600 K, which may relate to the thermal transport properties.
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Affiliation(s)
- Kota Morino
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan; (K.M.); (Y.M.)
| | - Yosuke Goto
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan; (K.M.); (Y.M.)
| | - Akira Miura
- Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Sapporo 060-8628, Japan;
| | - Chikako Moriyoshi
- Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan; (C.M.); (Y.K.)
| | - Yoshihiro Kuroiwa
- Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan; (C.M.); (Y.K.)
| | - Yoshikazu Mizuguchi
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan; (K.M.); (Y.M.)
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9
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Abstract
The conversion efficiency of the thermoelectric generator (TEG) is adversely affected by the quality of thermal contact between the module and the heat source. TEGs with the planar substrate are not suitable for the curved heat sources. Several attempts have been made to tackle this issue by fabricating complex tubular-shaped TEGs; however, all efforts have been limited to low-temperature applications. Furthermore, the electrical contact resistance of the module is critical to achieving a high-power output. In this work, we developed the tubular TEG with significantly low specific contact resistance by optimizing the joining process. We show that the modified resistance welding (MRW) performed by spark plasma sintering (SPS) is an efficient joining method for the fabrication of the TE module, with high feasibility and scalability. This research seeks to suggest important design rules to consider when fabricating TEGs.
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10
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Fan X, Zhang J, Yang Y, Xia D, Dong G, Li M, Qiu L, Zhang Y, Fan R. Synthesis of AgBiSe2 via a facile low temperature aqueous solution route for enhanced photoelectric properties devices. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.07.036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Bernges T, Peilstöcker J, Dutta M, Ohno S, Culver SP, Biswas K, Zeier WG. Local Structure and Influence of Sb Substitution on the Structure-Transport Properties in AgBiSe 2. Inorg Chem 2019; 58:9236-9245. [PMID: 31247817 DOI: 10.1021/acs.inorgchem.9b00874] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Owing to their intrinsically low thermal conductivity and chemical diversity, materials within the I-V-VI2 family, and especially AgBiSe2, have recently attracted interest as promising thermoelectric materials. However, further investigations are needed in order to develop a more fundamental understanding of the origin of the low thermal conductivity in AgBiSe2, to evaluate possible stereochemical activity of the 6s2 lone pair of Bi3+, and to further elaborate on chemical design approaches for influencing the occurring phase transitions. In this work, a combination of temperature-dependent X-ray diffraction, Rietveld refinements of laboratory X-ray diffraction data, and pair distribution function analyses of synchrotron X-ray diffraction data is used to tackle the influence of Sb substitution within AgBi1-xSbxSe2 (0 ⩽ x ⩽ 0.15) on the phase transitions, local distortions, and off-centering of the structure. This work shows that, similar to other lone-pair-containing materials, local off-centering and distortions can be found in AgBiSe2. Furthermore, electronic and thermal transport measurements, in combination with the modeling of point-defect scattering, highlight the importance of structural characterizations toward understanding changes induced by elemental substitutions. This work provides new insights into the structure-transport correlations of the thermoelectric AgBiSe2.
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Affiliation(s)
- Tim Bernges
- Institute of Physical Chemistry , Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17 , D-35392 Giessen , Germany.,Center for Materials Research , Justus-Liebig-University Giessen , Heinrich-Buff-Ring 16 , D-35392 Giessen , Germany
| | - Jan Peilstöcker
- Institute of Physical Chemistry , Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17 , D-35392 Giessen , Germany.,Center for Materials Research , Justus-Liebig-University Giessen , Heinrich-Buff-Ring 16 , D-35392 Giessen , Germany
| | - Moinak Dutta
- New Chemistry Unit , Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) , Jakkur P.O., Bangalore 560064 , India
| | - Saneyuki Ohno
- Institute of Physical Chemistry , Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17 , D-35392 Giessen , Germany.,Center for Materials Research , Justus-Liebig-University Giessen , Heinrich-Buff-Ring 16 , D-35392 Giessen , Germany
| | - Sean P Culver
- Institute of Physical Chemistry , Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17 , D-35392 Giessen , Germany.,Center for Materials Research , Justus-Liebig-University Giessen , Heinrich-Buff-Ring 16 , D-35392 Giessen , Germany
| | - Kanishka Biswas
- New Chemistry Unit , Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) , Jakkur P.O., Bangalore 560064 , India
| | - Wolfgang G Zeier
- Institute of Physical Chemistry , Justus-Liebig-University Giessen , Heinrich-Buff-Ring 17 , D-35392 Giessen , Germany.,Center for Materials Research , Justus-Liebig-University Giessen , Heinrich-Buff-Ring 16 , D-35392 Giessen , Germany
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12
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Sudo K, Goto Y, Sogabe R, Hoshi K, Miura A, Moriyoshi C, Kuroiwa Y, Mizuguchi Y. Doping-Induced Polymorph and Carrier Polarity Changes in Thermoelectric Ag(Bi,Sb)Se 2 Solid Solution. Inorg Chem 2019; 58:7628-7633. [PMID: 31074617 DOI: 10.1021/acs.inorgchem.9b01038] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Silver bismuth diselenide (AgBiSe2) is an n-type thermoelectric material that exhibits a complex structural phase transition from the hexagonal to cubic phase, while silver antimony diselenide (AgSbSe2) is a p-type thermoelectric material that crystallizes in the cubic phase at all temperatures. Here, we investigate the crystal structure and thermoelectric properties of Ag(Bi,Sb)Se2 solid solution, employing AgBi0.9Sb0.1Se2 and AgBi0.7Sb0.3Se2 as representative samples. The carrier polarity of AgBi0.9Sb0.1Se2 is converted from the n-type to p-type by Pb doping, accompanied by a polymorphic change to the cubic phase. It is difficult to obtain highly conductive p-type hexagonal AgBiSe2-based materials, although first-principles calculations predict high-performance thermoelectric properties for these systems. We also demonstrate that cubic AgBi0.7Sb0.3Se2 undergoes a polymorphic change to the hexagonal phase upon Nb doping. The present study show that polymorphic changes inevitably occurred upon Pb/Nb doping to optimize thermoelectric properties of Ag(Bi,Sb)Se2 solid solution.
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Affiliation(s)
- Kenta Sudo
- Department of Physics , Tokyo Metropolitan University , Hachioji 192-0397 , Japan
| | - Yosuke Goto
- Department of Physics , Tokyo Metropolitan University , Hachioji 192-0397 , Japan
| | - Ryota Sogabe
- Department of Physics , Tokyo Metropolitan University , Hachioji 192-0397 , Japan
| | - Kazuhisa Hoshi
- Department of Physics , Tokyo Metropolitan University , Hachioji 192-0397 , Japan
| | - Akira Miura
- Faculty of Engineering , Hokkaido University , Kita-13, Nishi-8 , Kita-ku, Sapporo , Hokkaido 060-8628 , Japan
| | - Chikako Moriyoshi
- Department of Physical Science , Hiroshima University , 1-3-1 Kagamiyama , Higashihiroshima , Hiroshima 739-8526 , Japan
| | - Yoshihiro Kuroiwa
- Department of Physical Science , Hiroshima University , 1-3-1 Kagamiyama , Higashihiroshima , Hiroshima 739-8526 , Japan
| | - Yoshikazu Mizuguchi
- Department of Physics , Tokyo Metropolitan University , Hachioji 192-0397 , Japan
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