ChemInform Abstract: Enhanced Figure‐of‐Merit in Se‐Doped p‐Type AgSbTe<sub>2</sub> Thermoelectric Compound.

Han, Lianfu; Xu, Jingkun; Tang, Xinfeng; Uher, Ctirad

doi:10.1002/chin.201049007

Cited by 5 publications

(14 citation statements)

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“…In fact, many of the state-of-the-art TE materials are tellurides, such as PbTe, 1,2,5 Bi 2 Te 3 18,19 and AgSbTe 2 . 20 The reported high TE performance in Cu 2-δ Se and Cu 2-δ S indicates that a high zTs may also be achieved in Cu 2-δ Te. However, recent studies showed that the zTs in Cu 2 Te is only approximately 0.3 at 900 K, 21,22 which is much lower than those in Cu 2 Se and Cu 2 S. Historically, the zTs in the tellurides have been reported to be higher than those in the selenides or the sulfides in classic TE materials, such as PbX (X = S, Se or Te) 1,2,5,23 and Bi 2 X 3 (X = S, Se or Te).…”

Section: Introductionmentioning

confidence: 99%

High thermoelectric performance in copper telluride

et al. 2015

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Section: Introductionmentioning

confidence: 99%

High thermoelectric performance in copper telluride

et al. 2015

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“…Figure 1 a shows the XRD patterns of both pristine AgSbTe 2 thick films developed at linear speed of 5 and 10 ms −1 , and Se-doped AgSbTe 1.98 Se 0.02 film prepared at 10 ms −1 . Selenium was chosen as a dopant because previous work displayed that 1% of Se is capable of inhibiting the formation of AgTe 2 impurities and improving the thermoelectric properties in bulk samples prepared by spark plasma sintering [ 9 , 14 ]. To be clear, the three films were labeled as SAT-5, SAT-10, and SATS-10 in the following discussion, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…AgSbTe 2 compound is not only the common end component of famous thermoelectric systems (AgSbTe 2 ) 1− x (GeTe) x [ 7 ] and (AgSbTe 2 ) 1− x (PbTe) x [ 3 ], but also has the highest figure-of-merit zT of all simple ternary compounds [ 4 , 8 , 9 , 10 ]. It has a large Seebeck coefficient and a low thermal conductivity, because of the complexity of ordering of Ag/Sb on the face-centered lattice and strong lattice vibrational anharmonicity [ 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, this previous research were focused on the thermoelectric properties of the bulk materials sintering from thick films/ribbons obtained after melt spinning. Meanwhile, the reported transport properties of cubic AgSbTe 2 compound varied from one research to another [ 4 , 8 , 9 , 10 , 11 , 12 , 14 , 15 , 17 , 18 , 19 , 23 ]. No efforts were put in the characterization of the melt-spun thick films itself.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic, Structural and Thermoelectric Properties of AgSbTe2 Thick Films Developed by Melt Spinning

Liu

et al. 2018

Nanomaterials

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Cubic AgSbTe2 compound is a metastable phase within Ag2Te-Sb2Te3 pseudo-binary phase diagram and theoretically rapid cooling molten elements to room temperature may be an effective way to obtain it. In this work, thick films composed of 5–10 nm fine grains were developed by a melt spinning technique. The formation mechanism of the nanostructure and its influences on the thermoelectric properties have been studied and correlated. Differential scanning calorimetry (DSC) analysis shows that the as-prepared films exhibit distinct thermodynamic properties when prepared under different cooling rates and doping element. A small amount of Se doping is effectively capable of inhibiting the emergence of the Ag2Te impurity and optimizing the electrical transport properties. All films have positive large Seebeck coefficient, but rather small positive or negative Hall coefficient, indicating a multicarrier nature of transport consisting of both holes and electrons. A power factor of ~1.3 was achieved at 500 K for Se-doped film for its excellent electrical conductivities. This result confirms that a combination of Se doping and melting spinning technique is an effective way to obtain high phase-pure AgSbTe2 compound and reveal its intrinsic transport properties routinely masked by impurities in sintering or slow-cooling bulk samples.

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“…evaluate the applicability of a materials with different underlying properties. 20,58,59 In this study, we applied an FOM for transparent conductors proposed by Haacke, 60…”

Section: Design Of Experiments and P-tcm Figure Of Meritmentioning

confidence: 99%

Machine Learning Optimization of p-Type Transparent Conducting Films

Wei

Gurudayal

et al. 2019

Chem. Mater.

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P-type transparent conducting materials (p-TCMs) are important components of optoelectronic devices including solar cells, photodetectors, displays, and flexible sensors. Cu-Zn-S (CZS) thin films prepared by chemical bath deposition (CBD) can have both high transparency in the visible range (>80%) as well as excellent hole conductivity (>1000 S cm-1). However, the interplay between the deposition parameters in the CBD process (metal and sulfur precursor concentrations, temperature, pH, complexing agents, etc.) creates a multi-dimensional parameter space such that optimization for a specific application is challenging and time consuming. Here, we show that strategic design of experiment (DOE) combined with machine learning (ML) allows for efficient optimization of p-TCM performance. The approach is guided by a figure of merit (FOM) calculated from the film conductivity and optical transmission in the desired spectral range. A specific example is shown using two steps of optimization using a selected subset of 4 experimental CBD factors. The machine learning model is based on support vector regression (SVR) employing a radial basis function (RBF) as the kernel function. 10-fold cross-validation was performed to mitigate overfitting. After the first round of optimization, predicted areas in the parameter space with maximal FOMs were selected for a second round of optimization. Films with optimal FOMs were incorporated into heterojunction solar cells and transparent photodiodes. The optimization approach shown here will be generally applicable to any materials synthesis process with multiple parameters.

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ChemInform Abstract: Enhanced Figure‐of‐Merit in Se‐Doped p‐Type AgSbTe₂ Thermoelectric Compound.

Abstract: AgSbSexTe2‐x samples with x ≥ 0.02 form a homogeneous single‐phase solid solution and exhibit considerably larger electrical conductivity compared with that of x = 0 and x = 0.01 samples in the temperature range of 400—700 K.

Cited by 5 publications

References 1 publication

High thermoelectric performance in copper telluride

High thermoelectric performance in copper telluride

Thermodynamic, Structural and Thermoelectric Properties of AgSbTe2 Thick Films Developed by Melt Spinning

Machine Learning Optimization of p-Type Transparent Conducting Films

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ChemInform Abstract: Enhanced Figure‐of‐Merit in Se‐Doped p‐Type AgSbTe2 Thermoelectric Compound.

Abstract: AgSbSexTe2‐x samples with x ≥ 0.02 form a homogeneous single‐phase solid solution and exhibit considerably larger electrical conductivity compared with that of x = 0 and x = 0.01 samples in the temperature range of 400—700 K.

Cited by 5 publications

References 1 publication

High thermoelectric performance in copper telluride

High thermoelectric performance in copper telluride

Thermodynamic, Structural and Thermoelectric Properties of AgSbTe2 Thick Films Developed by Melt Spinning

Machine Learning Optimization of p-Type Transparent Conducting Films

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Product

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ChemInform Abstract: Enhanced Figure‐of‐Merit in Se‐Doped p‐Type AgSbTe₂ Thermoelectric Compound.