Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-xSx polymorphic materials

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Standard

Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-xSx polymorphic materials. / Zhao, Kunpeng; Blichfeld, Anders Bank; Eikeland, Espen; Qiu, Pengfei; Ren, Dudi; Iversen, Bo Brummerstedt; Shi, Xun; Chen, Lidong.

I: Journal of Materials Chemistry A, Bind 5, Nr. 34, 14.09.2017, s. 18148-18156.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Harvard

Zhao, K, Blichfeld, AB, Eikeland, E, Qiu, P, Ren, D, Iversen, BB, Shi, X & Chen, L 2017, 'Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-xSx polymorphic materials', Journal of Materials Chemistry A, bind 5, nr. 34, s. 18148-18156. https://doi.org/10.1039/c7ta05788a

APA

Zhao, K., Blichfeld, A. B., Eikeland, E., Qiu, P., Ren, D., Iversen, B. B., Shi, X., & Chen, L. (2017). Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-xSx polymorphic materials. Journal of Materials Chemistry A, 5(34), 18148-18156. https://doi.org/10.1039/c7ta05788a

CBE

MLA

Vancouver

Author

Zhao, Kunpeng ; Blichfeld, Anders Bank ; Eikeland, Espen ; Qiu, Pengfei ; Ren, Dudi ; Iversen, Bo Brummerstedt ; Shi, Xun ; Chen, Lidong. / Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-xSx polymorphic materials. I: Journal of Materials Chemistry A. 2017 ; Bind 5, Nr. 34. s. 18148-18156.

Bibtex

@article{2b961cb374df440382b06bbfa6e4bd70,
title = "Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-xSx polymorphic materials",
abstract = "Recently, copper chalcogenides Cu2-x delta (delta = S, Se, Te) have attracted great attention due to their exceptional thermal and electrical transport properties. Besides these binary Cu2-x delta compounds, the ternary Cu2-x delta solid solutions are also expected to possess excellent thermoelectric performance. In this study, we have synthesized a series of Cu2Se1-xSx (x = 0.2, 0.3, 0.5, and 0.7) solid solutions by melting the raw elements followed by spark plasma sintering. The energy dispersive spectroscopy mapping, powder and single-crystal X-ray diffraction and X-ray powder diffraction studies suggest that Cu2Se and Cu2S can form a continuous solid solution in the entire composition range. These Cu2Se1-xSx solid solutions are polymorphic materials composed of varied phases with different proportions at room temperature, but single phase materials at elevated temperature. Increasing the sulfur content in Cu2Se1-xSx solid solutions can greatly reduce the carrier concentration, leading to much enhanced electrical resistivity and Seebeck coefficients in the whole temperature range as compared with those in binary Cu2Se. In particular, introducing sulfur at Se-sites reduces the speed of sound. Combining the strengthened point defect scattering of phonons, extremely low lattice thermal conductivities are obtained in these solid solutions. Finally, a maximum zT value of 1.65 at 950 K is achieved for Cu2Se0.8S0.2, which is greater than those of Cu2Se and Cu2S.",
keywords = "TEMPERATURES, DIFFRACTION, TRANSPORT, PHASE",
author = "Kunpeng Zhao and Blichfeld, {Anders Bank} and Espen Eikeland and Pengfei Qiu and Dudi Ren and Iversen, {Bo Brummerstedt} and Xun Shi and Lidong Chen",
year = "2017",
month = sep,
day = "14",
doi = "10.1039/c7ta05788a",
language = "English",
volume = "5",
pages = "18148--18156",
journal = "Journal of Materials Chemistry A",
issn = "2050-7488",
publisher = "ROYAL SOC CHEMISTRY",
number = "34",

}

RIS

TY - JOUR

T1 - Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-xSx polymorphic materials

AU - Zhao, Kunpeng

AU - Blichfeld, Anders Bank

AU - Eikeland, Espen

AU - Qiu, Pengfei

AU - Ren, Dudi

AU - Iversen, Bo Brummerstedt

AU - Shi, Xun

AU - Chen, Lidong

PY - 2017/9/14

Y1 - 2017/9/14

N2 - Recently, copper chalcogenides Cu2-x delta (delta = S, Se, Te) have attracted great attention due to their exceptional thermal and electrical transport properties. Besides these binary Cu2-x delta compounds, the ternary Cu2-x delta solid solutions are also expected to possess excellent thermoelectric performance. In this study, we have synthesized a series of Cu2Se1-xSx (x = 0.2, 0.3, 0.5, and 0.7) solid solutions by melting the raw elements followed by spark plasma sintering. The energy dispersive spectroscopy mapping, powder and single-crystal X-ray diffraction and X-ray powder diffraction studies suggest that Cu2Se and Cu2S can form a continuous solid solution in the entire composition range. These Cu2Se1-xSx solid solutions are polymorphic materials composed of varied phases with different proportions at room temperature, but single phase materials at elevated temperature. Increasing the sulfur content in Cu2Se1-xSx solid solutions can greatly reduce the carrier concentration, leading to much enhanced electrical resistivity and Seebeck coefficients in the whole temperature range as compared with those in binary Cu2Se. In particular, introducing sulfur at Se-sites reduces the speed of sound. Combining the strengthened point defect scattering of phonons, extremely low lattice thermal conductivities are obtained in these solid solutions. Finally, a maximum zT value of 1.65 at 950 K is achieved for Cu2Se0.8S0.2, which is greater than those of Cu2Se and Cu2S.

AB - Recently, copper chalcogenides Cu2-x delta (delta = S, Se, Te) have attracted great attention due to their exceptional thermal and electrical transport properties. Besides these binary Cu2-x delta compounds, the ternary Cu2-x delta solid solutions are also expected to possess excellent thermoelectric performance. In this study, we have synthesized a series of Cu2Se1-xSx (x = 0.2, 0.3, 0.5, and 0.7) solid solutions by melting the raw elements followed by spark plasma sintering. The energy dispersive spectroscopy mapping, powder and single-crystal X-ray diffraction and X-ray powder diffraction studies suggest that Cu2Se and Cu2S can form a continuous solid solution in the entire composition range. These Cu2Se1-xSx solid solutions are polymorphic materials composed of varied phases with different proportions at room temperature, but single phase materials at elevated temperature. Increasing the sulfur content in Cu2Se1-xSx solid solutions can greatly reduce the carrier concentration, leading to much enhanced electrical resistivity and Seebeck coefficients in the whole temperature range as compared with those in binary Cu2Se. In particular, introducing sulfur at Se-sites reduces the speed of sound. Combining the strengthened point defect scattering of phonons, extremely low lattice thermal conductivities are obtained in these solid solutions. Finally, a maximum zT value of 1.65 at 950 K is achieved for Cu2Se0.8S0.2, which is greater than those of Cu2Se and Cu2S.

KW - TEMPERATURES

KW - DIFFRACTION

KW - TRANSPORT

KW - PHASE

U2 - 10.1039/c7ta05788a

DO - 10.1039/c7ta05788a

M3 - Journal article

VL - 5

SP - 18148

EP - 18156

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

SN - 2050-7488

IS - 34

ER -