Thermoelectric properties of α-Zn/sub 3/P/sub 2/

Nagamoto, Y.; Hino, K.; Yoshitake, Hideya; Koyanagi, T.

doi:10.1109/ict.1998.740393

Cited by 5 publications

(11 citation statements)

References 14 publications

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“…This estimated value is very close to the previously reported bandgap of Zn 3 P 2 ∼ 1.5 eV [35], especially when energy gap reduction of semiconductors at high temperatures is taken into consideration [36]. The activation energy value of 0.72 eV is lower than the 1.10 eV reported previously by Nagamoto et al [20]. This could be the result of poor interfacial charge transfer in spark plasma sintered Zn 3 P 2 microparticles, unlike the dense Zn 3 P 2 nanowire pellets obtained in this study.…”

Section: Electrical Transport Propertiessupporting

confidence: 89%

“…The variation of thermal conductivities with temperature of both the unfunctionalized and functionalized Zn 3 P 2 nanowire pellets is plotted in figure 4. For comparison, the thermal conductivity of spark plasma sintered Zn 3 P 2 microparticles previously reported by Nagamoto et al [20] is also plotted in figure 4. Examination of this data shows that at low temperatures (up to ∼420 K) the thermal conductivities of both unfunctionalized and BDT functionalized Zn 3 P 2 nanowires and the Zn 3 P 2 microparticles are generally close to each other.…”

Section: Thermal Properties Of Bulk Nanostructured Pelletsmentioning

confidence: 92%

“…The lattice of α-Zn 3 P 2 is a distorted antifluorite structure with lowered symmetry to a tetragonal unit cell due to the partial filling of the lattice zinc sites resulting in a low lattice thermal conductivity [18] and p-type electrical conductivity [19]. Previous studies have indicated that Zn 3 P 2 exhibits a low thermal conductivity of 1.2 W m −1 K −1 [20], making it a material of interest for thermoelectric module fabrication. However, Zn 3 P 2 lacks the high electrical conductivity [20] and the surface stability [21][22][23] necessary for its widespread use in thermoelectric cells and modules.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have indicated that Zn 3 P 2 exhibits a low thermal conductivity of 1.2 W m −1 K −1 [20], making it a material of interest for thermoelectric module fabrication. However, Zn 3 P 2 lacks the high electrical conductivity [20] and the surface stability [21][22][23] necessary for its widespread use in thermoelectric cells and modules. The high surface reactivity and instability of zinc phosphide makes it an ideal test material.…”

Section: Introductionmentioning

confidence: 99%

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Thermoelectric properties of large-scale Zn₃P₂nanowire assemblies

et al. 2014

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Gram quantities of both unfunctionalized and 1,4-benzenedithiol (BDT) functionalized zinc phosphide (Zn3P2) nanowire powders, synthesized using direct reaction of zinc and phosphorus, were hot-pressed into highly dense pellets (≥98% of the theoretical density) for the determination of their thermoelectric performance. It was deduced that mechanical flexibility of the nanowires is essential for consolidating them in randomly oriented fashion into dense pellets, without making any major changes to their morphologies. Electrical and thermal transport measurements indicated that the enhanced thermoelectric performance expected of individual Zn3P2 nanowires is still retained within large-scale nanowire assemblies. A maximum reduction of 28% in the thermal conductivity of Zn3P2 resulted from nanostructuring. Use of nanowire morphology also led to enhanced electrical conductivity in Zn3P2. Interface engineering of the nanowires in the pellets, accomplished by hot-pressing BDT functionalized nanowires, resulted in an increase on both the Seebeck coefficient and the electrical conductivity of the nanowire pellets. It is believed that filtering of low energy carriers resulting from the variation of the chemical compositions at the nanowire interfaces is responsible for this phenomenon. Overall, this study indicated that mechanical properties of the nanowires along with the chemical compositions of their surfaces play a hitherto unknown, but vital, role in realizing highly efficient bulk thermoelectric modules based on nanowires.

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Section: Electrical Transport Propertiessupporting

confidence: 89%

Section: Thermal Properties Of Bulk Nanostructured Pelletsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermoelectric properties of large-scale Zn₃P₂nanowire assemblies

et al. 2014

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“…73 A similar temperature dependence has also been observed in Cu-doped Zn 3 P 2 , with sharp increases in S occurring above 600 K, coinciding with a discontinuity in s(T). 72 Mn 2+ can be used instead of Zn 2+ due to localisation of the 3d 5 electrons, also yielding semiconducting materials with similar behaviour but a lower max zT, 73 but brings the prospect of coupling to magnetism. 101,102 The performance of YbCuZnP 2 -based compositions with 1 : 1 mixtures of Cu + and Zn 2+ (valence balanced through incorporation of Yb 3+ ) is much more promising.…”

Section: The 1 : 2 : 2 Phases -Ezn 2 P 2 and Derivativesmentioning

confidence: 99%

Recent progress in phosphide materials for thermoelectric conversion

Quinn

Bos

2023

J. Mater. Chem. A

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Compositional disorder and its effect on the thermoelectric performance of Zn₃P₂nanowire–copper nanoparticle composites

Brockway¹,

Vasiraju²,

Vaddiraju³

2014

Nanotechnology

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Recent studies indicated that nanowire format of materials is ideal for enhancing the thermoelectric performance of materials. Most of these studies were performed using individual nanowires as the test elements. It is not currently clear whether bulk assemblies of nanowires replicate this enhanced thermoelectric performance of individual nanowires. Therefore, it is imperative to understand whether enhanced thermoelectric performance exhibited by individual nanowires can be extended to bulk assemblies of nanowires. It is also imperative to know whether the addition of metal nanoparticle to semiconductor nanowires can be employed for enhancing their thermoelectric performance further. Specifically, it is important to understand the effect of microstructure and composition on the thermoelectric performance on bulk compound semiconductor nanowire-metal nanoparticle composites. In this study, bulk composites composed of mixtures of copper nanoparticles with either unfunctionalized or 1,4-benzenedithiol (BDT) functionalized Zn₃P₂ nanowires were fabricated and analyzed for their thermoelectric performance. The results indicated that use of BDT functionalized nanowires for the fabrication of composites leads to interface-engineered composites that have uniform composition all across their cross-section. The interface engineering allows for increasing their Seebeck coefficients and electrical conductivities, relative to the Zn₃P₂ nanowire pellets. In contrast, the use of unfunctionalized Zn₃P₂ nanowires for the fabrication of composite leads to the formation of composites that are non-uniform in composition across their cross-section. Ultimately, the composites were found to have Zn₃P₂ nanowires interspersed with metal alloy nanoparticles. Such non-uniform composites exhibited very high electrical conductivities, but slightly lower Seebeck coefficients, relative to Zn₃P₂ nanowire pellets. These composites were found to show a very high zT of 0.23 at 770 K, orders of magnitude higher than either interface-engineered composites or Zn₃P₂ nanowire pellets. The results indicate that microstructural composition of semiconductor nanowire-metal nanoparticle composites plays a major role in determining their thermoelectric performance, and such composites exhibit enhanced thermoelectric performance.

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Thermoelectric properties of α-Zn/sub 3/P/sub 2/

Cited by 5 publications

References 14 publications

Thermoelectric properties of large-scale Zn₃P₂nanowire assemblies

Thermoelectric properties of large-scale Zn₃P₂nanowire assemblies

Recent progress in phosphide materials for thermoelectric conversion

Compositional disorder and its effect on the thermoelectric performance of Zn₃P₂nanowire–copper nanoparticle composites

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Thermoelectric properties of α-Zn/sub 3/P/sub 2/

Cited by 5 publications

References 14 publications

Thermoelectric properties of large-scale Zn3P2nanowire assemblies

Thermoelectric properties of large-scale Zn3P2nanowire assemblies

Recent progress in phosphide materials for thermoelectric conversion

Compositional disorder and its effect on the thermoelectric performance of Zn3P2nanowire–copper nanoparticle composites

Contact Info

Product

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Thermoelectric properties of large-scale Zn₃P₂nanowire assemblies

Thermoelectric properties of large-scale Zn₃P₂nanowire assemblies

Compositional disorder and its effect on the thermoelectric performance of Zn₃P₂nanowire–copper nanoparticle composites