Thermal Conductivity, Thermoelectric Power, and Thermal Expansion of CuInS2xSe2(1−x)

Makovetskaya, L. A.; Bodnar, I. V.; Корзун, Б. В.; Yaroshevich, G. P.

doi:10.1002/pssa.2210740157

Cited by 16 publications

(8 citation statements)

References 6 publications

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“…16,17 ͑i͒ ZnO is a chemically benign, structurally stable, low-cost n-type semiconductor whose electronic conductivity can be easily enhanced by doping to become a high electronic conductor even at low temperatures. ͑ii͒ The thermal-expansion coefficient of ZnO reported ͑i.e., 8.627 and 7.2 ϫ 10 −6 K −1 at 300 K͒ 18,19 agrees well with that of 8 mo1 % Y-doped ZrO 2 ͑i.e., ϳ7-10 ϫ 10 −6 K −1 at 298-1000 K 20 ͒. ͑iii͒ Oxygen nonstoichiometry in ZnO is considered to be small, if not negligible.…”

supporting

confidence: 87%

Electrochemical Characteristics of ZnO-Nanowire/Yttria-Stabilized Zirconia Composite as a Cathode for SOFCs

Park

Kim

2007

Electrochem. Solid-State Lett.

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We report electrical characteristics of a porous composite cathode for the solid oxide fuel cell ͑SOFC͒ consisting of ZnO nanowires ͑ZnO-NW͒ and yttria-stabilized zirconia ͑YSZ͒ particles. This composite cathode significantly reduces concerns about chemical and mechanical compatibility with the YSZ electrolyte, which has remained one of the main challenges for practical utilization of the SOFC. The area-specific polarization resistivity of this composite electrode was comparable to, if not lower than, that of conventional cathodes. The results demonstrate that, with size and material optimization, the ZnO-NW/YSZ porous composite cathode can be a viable alternative to conventional cathodes for SOFCs.The solid oxide fuel cell ͑SOFC͒ is an environmentally benign power generation device that directly converts chemical energy into electrical energy. A typical SOFC is composed of a porous cathode and anode separated by an impermeable electrolyte such that, as far as materials are concerned, not only the individual functionality but also the chemical and mechanical compatibility of each cell component must be fulfilled to maximize the cell performance. While the electrical power output and efficiency of the cell are often adequately met, long-term durability remains one of the main challenges for practical utilization of the SOFC at present. 1 The problems associated with durability largely result from the thermal expansion coefficient mismatch between the cathode and electrolyte. 1,2 Accordingly, besides electronic/catalytic functionality, very similar, if not identical, thermal expansion of the cathode with the electrolyte is a prerequisite. 1 Various perovskite materials have been tested as the cathode. Among them, LaMnO 3 -based systems ͑e.g., Sr-doped LaMnO 3 , LSM͒ are considered to be one of the most promising cathode materials for the SOFC employing yttria-stabilized zirconia ͑YSZ͒ as an electrolyte due to its high electronic conductivity, high catalytic activity, and similar thermal expansion coefficient to that of the YSZ electrolyte. 1-6 It is realized, however, that the long-term durability of the SOFC with the LSM cathode is still inadequate, mainly due to the following: 1 ͑i͒ oxygen nonstoichiometry in the LaMnO 3 that leads to undesired dimensional changes, ͑ii͒ lanthanum deficiency ͑or excess͒ that can eventually cause disintegration of the LaMnO 3 structure due to the chemical instability of secondary phases such as La 2 O 3 ͑or Mn 3 O 4 ͒ present, and ͑iii͒ formation of La 2 Zr 2 O 7 at the LaMnO 3 /YSZ interface that serves as a resistive phase and that causes the thermal stresses at the interface, leading to degradation of SOFC performance. Such problems are not exclusive to LaMnO 3 -based systems but apply to most electrode materials employed in the SOFC. [7][8][9][10][11][12] It has been learned that composite cathodes ͑e.g., LSM/YSZ͒ often offer better cell performance than single-phase ones. 5 Introducing YSZ into the LSM cathode, for instance, allows for an extended three-phase boundary ͑TPB͒ at...

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supporting

confidence: 87%

Electrochemical Characteristics of ZnO-Nanowire/Yttria-Stabilized Zirconia Composite as a Cathode for SOFCs

Park

Kim

2007

Electrochem. Solid-State Lett.

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“…How then does the large discrepancy in heat conductivity arise between these two materials? Clearly, the conventional heat transport model is inadequate to explain ) for different diamondoid compounds, [24][25][26][27][28][29][30][31] the dash line is a guide to the eye. c) The temperature dependence of lattice thermal conductivity for CuGaTe 2 , CuInTe 2 , and AgGaTe 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1b shows the relationship between room temperature lattice thermal conductivities and the weight factor: T m 3/2 /( m a 1/2 V a 2/3 ) for different diamondoid materials. [ 24–31 ] Obviously, the Cu‐based compounds show a much stronger mass and volume dependence behavior than that of the Ag‐based materials, which lead to a fivefold larger β factor in the former. According to Keyes’ model, the weight factor fails to explain the large disparity in heat transport properties between these materials, and the fundamental reason should be attributed to the factor of five difference in structural parameter, β .…”

Section: Introductionmentioning

confidence: 99%

Hidden Local Symmetry Breaking in Silver Diamondoid Compounds is Root Cause of Ultralow Thermal Conductivity

Xie

Božin

et al. 2022

Advanced Materials

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mobilities it favors, because such tetrahedral structures are more tightly packed and usually have stiffer lattices than the rocksalt materials. They present high phonon frequencies and velocities giving rise to very high thermal conductivity. [9,10] Typical compound semiconductors in this class include the zincblende-, wurtzite-, and the chalcopyrite-type materials. [11][12][13][14] The AMQ 2 (A = Cu, Ag; M = Al, Ga, In, Tl; Q = S, Se, Te) ternary diamondoid compounds are a large family of relatively wide band gap (E g > 1 eV) semiconductors that possess various unique transport properties, and have many important applications in photovoltaic cells, [15] nonlinear optics, [16] and thermoelectricity. [11,13] Recently, a thermoelectric figure of merit (ZT) beyond 1.6 has been reported in Cu 1−x Ag x InTe 2 [17] and (Cu 1−x Ag x )(In 1−y Ga y ) Te 2 diamondoid compounds. [18,19] These performance advances have drawn intense interest in fundamental understanding of the electronic and heat transport properties of the diamondoid compounds in greater detail.The ternary diamondoid compounds (chalcopyrites) derived from the diamond structure can be considered as a double sphalerite cell (M'Q) stacked along the c-axis, where the divalent M' cation is replaced by monovalent A and trivalent M, see Figure 1a. Among compositions with the identical crystal structure, the Ag-based diamondoid compounds exhibit a much lower intrinsic lattice thermal conductivity than the Cu-based Typically, conventional structure transitions occur from a low symmetry state to a higher symmetry state upon warming. In this work, an unexpected local symmetry breaking in the tetragonal diamondoid compound AgGaTe 2 is reported, which, upon warming, evolves continuously from an undistorted ground state to a locally distorted state while retaining average crystallographic symmetry. This is a rare phenomenon previously referred to as emphanisis. This distorted state, caused by the weak sd 3 orbital hybridization of tetrahedral Ag atoms, causes their displacement off the tetrahedron center and promotes a global distortion of the crystal structure resulting in strong acoustic-optical phonon scattering and an ultralow lattice thermal conductivity of 0.26 W m −1 K −1 at 850 K in AgGaTe 2 . The findings explain the underlying reason for the unexpectedly low thermal conductivities of silver-based compounds compared to copper-based analogs and provide a guideline to suppressing heat transport in diamondoid and other materials.

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“…The value of α glass is taken as 8.01 × 10 −6 /°C. As the themal expansion coefficient for Zn 0.76 Mg 0.24 O is not available, the value of ZnO is taken (8.63 × 10 −6 /°C) for α film 11. The evaluated thermal stress was found to be tensile in nature, which varied from 19 to 38 GPa with the increase of annealing temperature from 50 to 500 °C.…”

Section: Resultsmentioning

confidence: 99%

Annealing effect on the structural, opto‐electronic and photoluminescence properties of sprayed Zn_0.76Mg_0.24O films for application in solar cells

Prathap

Reddy

Revathi

et al. 2010

Physica Status Solidi (a)

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In recent years, Zn 1Àx Mg x O has attracted the attention of many researchers as its physical behaviour can be suitably controlled by varying the Zn/Mg ratio. The superior advantages associated with Zn 1Àx Mg x O make this material as a potential candidate for application in Cu(InGa)Se 2 -based solar cells. In the present investigation, Zn 1Àx Mg x O films have been prepared by spray pyrolysis at 300 8C and subsequently annealed in argon and oxygen ambience at temperatures that vary in the range, 100-500 8C. The changes occurred in the physical characteristics of the layers as a function of annealing temperature have been studied. The influence of annealing on the structure, topography, opto-electronic and photoluminescence properties was found to be significant. The results have been presented and discussed.

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Thermal Conductivity, Thermoelectric Power, and Thermal Expansion of CuInS2xSe2(1−x)

Cited by 16 publications

References 6 publications

Electrochemical Characteristics of ZnO-Nanowire/Yttria-Stabilized Zirconia Composite as a Cathode for SOFCs

Electrochemical Characteristics of ZnO-Nanowire/Yttria-Stabilized Zirconia Composite as a Cathode for SOFCs

Hidden Local Symmetry Breaking in Silver Diamondoid Compounds is Root Cause of Ultralow Thermal Conductivity

Annealing effect on the structural, opto‐electronic and photoluminescence properties of sprayed Zn_0.76Mg_0.24O films for application in solar cells

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Thermal Conductivity, Thermoelectric Power, and Thermal Expansion of CuInS2xSe2(1−x)

Cited by 16 publications

References 6 publications

Electrochemical Characteristics of ZnO-Nanowire/Yttria-Stabilized Zirconia Composite as a Cathode for SOFCs

Electrochemical Characteristics of ZnO-Nanowire/Yttria-Stabilized Zirconia Composite as a Cathode for SOFCs

Hidden Local Symmetry Breaking in Silver Diamondoid Compounds is Root Cause of Ultralow Thermal Conductivity

Annealing effect on the structural, opto‐electronic and photoluminescence properties of sprayed Zn0.76Mg0.24O films for application in solar cells

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Product

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Annealing effect on the structural, opto‐electronic and photoluminescence properties of sprayed Zn_0.76Mg_0.24O films for application in solar cells