Transport coefficients and defect structure of Sb2−Ag Te3 single crystals

Lošťák, P.; Drašar, Č.; Horák, J.; Zhou, Zengzua; Dyck, Jeffrey S.; Uher, C.

doi:10.1016/j.jpcs.2006.01.115

Cited by 38 publications

(22 citation statements)

References 13 publications

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“…For the application of Bi-Te or Bi-Sb based alloys it is necessary to prepare single or polycrystalline materials with well defined physical parameters (Seebeck coefficient, electrical and thermal conductivity, mobility of free carriers) that can be modified by doping suitable foreign atoms. Such researches as the incorporations of Ag and Ti in the crystal lattice of Bi 2 Sb 3 [1][2][3] that can noticeably influence the transport properties and concentration holes, and as doping of Cu in the GeBi 4 Te 7 or Tl in the (Bi, Sb)-Te alloys that can substantially reduce the lattice thermal conductivity and electron mobility [4][5][6]. Since the multi-element compounds can exhibit some unique characteristics such as non-uniform distribution of Sb atoms and isoelectronic substitution between metal ions in the lattice in the K-Bi-Sb-Se and Ag-Pb-Sb-Te thermoelectric alloys [7,8], and introductions of compounds into the Bi 2 Te 3 to form nATe.mBi 2 Te 3 (A = Ge, Sn, Te) [9] evidenced the potential importance for thermoelectric applications, supposing that these introductions can increase the crystal defects through lattice disorder or alteration of crystal constant of cells.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure analysis and thermoelectric properties of p-type pseudo-binary (Al2Te3)x–(Bi0.5Sb1.5Te3)1−x (x=0∼0.2) alloys prepared by spark plasma sintering

Cui

Xue

Xiu

et al. 2008

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Crystal structure analysis and thermoelectric properties of p-type pseudo-binary (Al2Te3)x–(Bi0.5Sb1.5Te3)1−x (x=0∼0.2) alloys prepared by spark plasma sintering

Cui

Xue

Xiu

et al. 2008

Journal of Alloys and Compounds

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“…For silver, evidence has been reported that 1.7 holes result from each Ag atom, 19 yet another study reported that each silver atom yields less than one hole. 20 For this work, we assume that each silver atom acts as a singly ionized acceptor. SIMS analysis of the ptype (Bi,Sb) 2 (Se,Te) 3 showed a peak concentration of 2 Â 10 20 /cm 3 at the upper surface.…”

mentioning

confidence: 99%

Controlled improvement in specific contact resistivity for thermoelectric materials by ion implantation

Taylor¹,

Maddux²,

Meissner³

et al. 2013

Applied Physics Letters

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To obtain reduced specific contact resistivity, iodine donors and silver acceptors were ion-implanted into n-type and p-type (Bi,Sb)2(Se,Te)3 materials, respectively, to achieve >10 times higher doping at the surface. Implantation into n-type materials caused the specific contact resistivity to decrease from 1.7 × 10−6 Ω cm2 to 4.5 × 10−7 Ω cm2. Implantation into p-type materials caused specific contact resistivity to decrease from 7.7 × 10−7 Ω cm2 to 2.7 × 10−7 Ω cm2. For implanted thin-film superlattices, the non-implanted values of 1.4 × 10−7 Ω cm2 and 5.3 × 10−8 Ω cm2 precipitously dropped below the detection limit after implantation, ≤10−8 Ω cm2. These reductions in specific contact resistivity are consistent with an increase in tunneling across the contact.

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“…Via (27), we can calculate the electron thermal conductivity to be 3.49 W/Km. Given that the total thermal conductivity is 4.2 W/Km [37], we can deduce that the phonon thermal conductivity is 0.71 W/Km. The Seebeck coefficient and the phonon velocity are 79 µV/K and 2900 m/s, respectively [37].…”

Section: Materials Properties and Operating Conditions 61 Materials Prmentioning

confidence: 99%

“…Given that the total thermal conductivity is 4.2 W/Km [37], we can deduce that the phonon thermal conductivity is 0.71 W/Km. The Seebeck coefficient and the phonon velocity are 79 µV/K and 2900 m/s, respectively [37]. The total specific heat capacity is 1.34 MJ/m 3 K [38,39].…”

Section: Materials Properties and Operating Conditions 61 Materials Prmentioning

confidence: 99%

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Enhancement of a photovoltaic cell performance by a coupled cooled nanocomposite thermoelectric hybrid system, using extended thermodynamics

Machrafi

2017

Current Applied Physics

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A new analytical mathematical model is developed, describing a cooled photovoltaicthermoelectric hybrid system. The thermoelectric material is a nanocomposite where the model takes into account size-dependent non-local thermoelectric properties from an extended thermodynamic point of view. The photovoltaic device powers also the cooling system. The model determines first the optimum thickness of the photovoltaic device, then studies the influence of several size-related parameters on the thermoelectric efficiency (also related to the figure of merit) and finally, coupled to a cooling device, the overall efficiency. For the photovoltaic part, the model is applied to two materials, mono-crystalline and poly-crystalline silicon. The thermoelectric part of the model is applied to an n-leg nanocomposite made out of Sb2Te3 nanoparticles in a Bi2Te3 matrix and of a p-leg nanocomposite made out of Bi2Se3 nanoparticles in a Bi2Te3 matrix. An optimal total photovoltaic device size has been found to be around 127 µm and 1.25 µm for the mono-and poly-crystalline silicon, respectively, leading to efficiencies up to 20 %, depending on photovoltaic recombination characteristics. With the cooling device, the overall efficiency was increased by up to an additional 10 % (an increase of almost 50 %), leading to overall efficiencies around 25 %. IntroductionDevelopments in renewable energy seek to alleviate the global energy crisis and reduce its impact on the environment. One way is to use solar energy. By means of photovoltaic (PV) solar cells, photonic energy is mainly converted into electricity and waste heat. PV cells have relatively low conversion efficiency, because they can only utilize part of the incident solar energy due to its given bandgap, and require often hybrid configurations [1]. One way to increase the efficiency of PV cells is using thermal management by means of heat sinks [2]. Otherwise, the waste heat can be used in order to be converted to more electricity via thermoelectric devices (TE) [3][4][5][6]. As a common PV cell converts a large amount of solar irradiant energy into heat, a hybrid PV cell and TE device (PVTE) may be a prospective way to improve the overall efficiency of solar energy [7]. One form of PVTE systems uses the socalled spectrum splitting concentrating system, where the photons with an energy out of the PV working waveband are incident to the TE devices, generating thereby electricity via the thermoelectric effect [8][9][10]. This system is complex and the heat produced from the PV is still not used. Connecting the TE device directly at the dark side of the PV cell is simpler and theoretically all thermal energy can be used by the TE device [11], of which the efficiency can be even increased by cooling the TE device [7,12]. It is the latter hybrid system that we consider in this work. As the efficiency in TE devices are proportional (though not necessarily linearly) on mainly the temperature difference across the device and the figure of merit, both are to be increased. The temper...

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Transport coefficients and defect structure of Sb2−Ag Te3 single crystals

Cited by 38 publications

References 13 publications

Crystal structure analysis and thermoelectric properties of p-type pseudo-binary (Al2Te3)x–(Bi0.5Sb1.5Te3)1−x (x=0∼0.2) alloys prepared by spark plasma sintering

Crystal structure analysis and thermoelectric properties of p-type pseudo-binary (Al2Te3)x–(Bi0.5Sb1.5Te3)1−x (x=0∼0.2) alloys prepared by spark plasma sintering

Controlled improvement in specific contact resistivity for thermoelectric materials by ion implantation

Enhancement of a photovoltaic cell performance by a coupled cooled nanocomposite thermoelectric hybrid system, using extended thermodynamics

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