First-principles study of the electronic, optical, and lattice vibrational properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>AgSbTe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Ye, Lin Hui; Hoang, Khang; Freeman, Arthur J; Mahanti, S. D.; He, Jian; Tritt, Terry M.; Kanatzidis, M. G.

doi:10.1103/physrevb.77.245203

Cited by 81 publications

(47 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This problem has been addressed by using the screened-exchange local-density approximation (sx-LDA) method. The sx-LDA results predict a vanishing density of states at the Fermi level, which is consistent with the semiconducting behavior of AgSbTe 2 [118]. Various optical properties, including the dielectric characteristics, absorption coefficient and refractive index, as a function of the photon energy, have also been theoretically studied by using the sx-LDA method, with all predictions being in a very good agreement with experimental results.…”

Section: Agsbtesupporting

confidence: 68%

Waste Thermal Energy Harvesting (I): Thermoelectric Effect

Kong

Hng

et al. 2014

Waste Energy Harvesting

View full text Add to dashboard Cite

Waste thermal energy (heat) is the second type of energy to be discussed. Usually, it is generated in a process by way of fuel combustion or chemical reaction, and then ''dumped'' into the environment even though it could still be reused for some useful and economic purpose. The essential quality of heat is not the amount but rather its ''value.'' The strategy of how to recover this heat depends in part on the temperature of the waste heat gases and the economics involved.Waste thermal energy is one of the largest sources of inexpensive, clean, and fuel-free energy available. The vast amount of heat that is discharged into the atmosphere everyday is one of the best sources of clean, fuel-free, and inexpensive energy. According to the US Department of Energy (DOE), up to 50 % of all fuels burned in the US goes unused into the atmosphere as waste heat is released to the atmosphere. Research indicates that the energy currently wasted by the industrial facilities in the U.S. could produce as much as 20 % of the total US electrical output with the associated 20 % reduction in greenhouse gas emissions. Various sources that can be classified as waste thermal energy (heat) with their properties are listed in Tables 4.1 , 4.2, 4.3, and 4.4 [1].Among the large quantities of waste heat that have been directly discharged into the Earth's environment, much of it is at temperatures which are too low to recover by using the conventional electrical power generators. Thermoelectric power generation, also known as thermoelectricity, has been demonstrated as a promising technology in the direct conversion of low-grade thermal energy, such as waste heat energy into electrical power. Probably, the earliest application is the utilization of waste heat from a kerosene lamp to provide thermoelectric energy to power a wireless device. Thermoelectric generators have also been used to provide small amounts electricity to remote regions, for instance, Northern Sweden, as an L. B. Kong et al., Waste Energy Harvesting, Lecture Notes in Energy 24,

show abstract

Section: Agsbtesupporting

confidence: 68%

Waste Thermal Energy Harvesting (I): Thermoelectric Effect

Kong

Hng

et al. 2014

Waste Energy Harvesting

View full text Add to dashboard Cite

show abstract

“…On the other hand, a simple model of disorder, involving mass and volume fluctuations only, does not explain such a low value of thermal conductivity, especially in the case of AgSbTe 2 in which all atomic masses and volumes are close. It is possible that the difference in force constants and very different nature of the Te-Ag and the Te-Sb bonds 11 can provide an explanation to this dilemma.…”

Section: Introductionmentioning

confidence: 93%

Influence of Doping on Structural and Thermoelectric Properties of AgSbSe2

Wojciechowski

Schmidt

Toboła

et al. 2009

Journal of Elec Materi

View full text Add to dashboard Cite

A series of samples with nominal compositions of AgSb 1Àx Sn x Se 2 (with x = 0.0, 0.1, 0.2, and 0.3) and AgSbSe 2Ày Te y (with y = 0.0, 0.25, 0.5, 0.75, and 1.0) were prepared. The crystal structure of both single crystals and polycrystalline samples was analyzed using x-ray and neutron diffractometry. The electrical conductivity, thermal conductivity, and Seebeck coefficient were measured within the temperature range from 300 K to 700 K. In contrast to intrinsic AgSbSe 2 , samples doped with Sn and Te exhibit apparent semiconducting properties (E g = 0.3 eV to 0.5 eV), lower electrical conductivity, and higher values of the Seebeck coefficient for a small amount of Sn (x = 0.1). Further doping leads to decrease of the thermoelectric power and increase of the electrical conductivity. In order to explain electron transport behavior observed in pure and doped AgSbSe 2 , electronic structure calculations were performed by the Korringa-Kohn-Rostoker method with coherent potential approximation (KKR-CPA).

show abstract

“…Clearly, these early materials were inhomogeneous. Recent firstprinciple calculations [10][11][12] predicted AgSbTe 2 to be a semimetal, with electrons in ellipsoidal pockets at the L-point of the Brillouin zone, and the holes in two sets of pockets near the X-points. 13 Modeling predicts a significantly larger density of states mass of holes than electrons.…”

Section: Introductionmentioning

confidence: 99%

Doping Effects on the Thermoelectric Properties of AgSbTe2

Jovovic

Heremans

2009

Journal of Elec Materi

View full text Add to dashboard Cite

A doping study of ternary alloys AgSbTe 2 doped with excess AgTe, NaTe, NaSe, TlTe, BiTe, and excess Pb showed that carrier concentrations can be effectively manipulated. Measured thermopower and resistivity indicate a shift of the power factor peak toward the lower-temperature regime. The measured figure of merit ZT increases from 0.5 to 1.2 after doping with NaSe, and 1.05 with TlTe, at 400 K. We also show that doping with Bi and Pb has a negative effect on the thermoelectric properties of these alloys.

show abstract

First-principles study of the electronic, optical, and lattice vibrational properties ofAgSbTe2

Cited by 81 publications

References 21 publications

Waste Thermal Energy Harvesting (I): Thermoelectric Effect

Waste Thermal Energy Harvesting (I): Thermoelectric Effect

Influence of Doping on Structural and Thermoelectric Properties of AgSbSe2

Doping Effects on the Thermoelectric Properties of AgSbTe2

Contact Info

Product

Resources

About