Boosting thermoelectric performance of p-type SiGe alloys through in-situ metallic YSi2 nanoinclusions

Ahmad, Sajid; Singh, Ajay; Bohra, Anil; Basu, Ranita; Bhattacharya, Shovit; Bhatt, Ranu; Meshram, K.N.; Roy, Mainak; Sarkar, Shaibal K.; Hayakawa, Y.; Debnath, A.K.; Aswal, D. K.; Gupta, S. K.

doi:10.1016/j.nanoen.2016.07.002

Cited by 88 publications

(65 citation statements)

References 45 publications

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“…Ahmad et al reported the enhanced zT value of 1.81 in the P-type SiGe alloys by the incorporation of metallic Yttrium silicide nanoparticles [89]. The thermal conductivity is reduced by YSi 2 nano-inclusions due to the formation of coherent states with SiGe matrix and also due to the reduction of grain size [89].…”

Section: Sige Alloysmentioning

confidence: 99%

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Odyssey of thermoelectric materials: foundation of the complex structure

et al. 2018

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Growing energy crises and pollution are the major issues of the modern world. The thermoelectric concept seems to be the promising solution to deal with these problems, because of the ability of thermoelectric materials to convert waste heat into electricity without adding more pollution to the atmosphere. The development of thermoelectric materials (TE) is driven by fundamental interest and their potential applications. To replace the conventional techniques, the figure of merit (zT) of the thermoelectric materials should be higher than 2 for power generation and greater than 3 for cooling. Recently, there have been significant advances in enhancing the figure of merit of thermoelectric materials and also to find new materials for the thermoelectric purpose. Low thermal conductivity is the key for a promising thermoelectric material that can be achieved through the complex structures. This review provides insights into the recent advancements in improving the efficiency of thermoelectric systems, complex nature of thermoelectric materials, with a concise introduction to preparative approaches for thermoelectric (TE) materials.

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Section: Sige Alloysmentioning

confidence: 99%

“…Such high zT resulted from Figure 15. Temperature dependence of zT for recently developed efficient SiGe alloy thermoelectric [190,191,89].…”

Section: Half-heusler Alloysmentioning

confidence: 99%

Odyssey of thermoelectric materials: foundation of the complex structure

et al. 2018

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“…This is because in common thermoelectric materials, such as PbTe, a large * s.foster@warwick.ac.uk portion of the phonons have mean-free paths for scattering on the order of nanometers [29]. This technique is therefore widely used to enhance thermoelectric performance in a broad range of materials, including BiTe [30,31], PbTe [23,32,33], SiGe [16,34,35], ZnSb [25,36], FeSi [37], MnSi [38], SnTe [39], PbS [40], CuSe [41], YbCoSb [42], and ZrNiSn [43]. Indeed, by embedding nanoinclusions within PbTe in a hierarchical manner, record high ZT = 2.2 values were achieved due to drastic reductions in κ, but also due to retaining high power factors [23].…”

Section: Introductionmentioning

confidence: 99%

“…While the impact of nanoinclusions on the thermal conductivity is well documented [18,45], previous works are not as clear on their impact on the power factor, with results varying significantly, from only small influence [30,31,34,46], to large potential improvements [25,36,42,47]. Thus, it is imperative that a high level of understanding on the influence of nanoinclusions on the power factor, both qualitative and quantitative, is also established, if ZT is to be maximized.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric power factor of nanocomposite materials from two-dimensional quantum transport simulations

2017

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Nanocomposites are promising candidates for the next generation of thermoelectric materials since they exhibit extremely low thermal conductivities as a result of phonon scattering on the boundaries of the various material phases. The nanoinclusions, however, should not degrade the thermoelectric power factor, and ideally should increase it, so that benefits to the ZT figure of merit can be achieved. In this work we employ the nonequilibrium Green's function quantum transport method to calculate the electronic and thermoelectric coefficients of materials embedded with nanoinclusions. For computational effectiveness we consider two-dimensional nanoribbon geometries, however, the method includes the details of geometry, electron-phonon interactions, quantization, tunneling, and the ballistic to diffusive nature of transport, all combined in a unified approach. This makes it a convenient and accurate way to understand electronic and thermoelectric transport in nanomaterials, beyond semiclassical approximations, and beyond approximations that deal with the complexities of the geometry. We show that the presence of nanoinclusions within a matrix material offers opportunities for only weak energy filtering, significantly lower in comparison to superlattices, and thus only moderate power factor improvements. However, we describe how such nanocomposites can be optimized to limit degradation in the thermoelectric power factor and elaborate on the conditions that achieve the aforementioned mild improvements. Importantly, we show that under certain conditions, the power factor is independent of the density of nanoinclusions, meaning that materials with large nanoinclusion densities which provide very low thermal conductivities can also retain large power factors and result in large ZT figures of merit.

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“…The Si x Ge 1−x H 30 alloys are predicted to have finite gaps in the range of 1.09-2.29 eV for 0 ≤ x ≤ 1. Ge and Si are known to be completely miscible in any ratio, and GeSi random alloys have been investigated for many years [31][32][33] . However, the creation of siligenes and their derivatives have rarely been reported.…”

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confidence: 99%

Two-dimensional gersiloxenes with tunable bandgap for photocatalytic H2 evolution and CO2 photoreduction to CO

et al. 2020

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The discovery of graphene and graphene-like two-dimensional materials has brought fresh vitality to the field of photocatalysis. Bandgap engineering has always been an effective way to make semiconductors more suitable for specific applications such as photocatalysis and optoelectronics. Achieving control over the bandgap helps to improve the light absorption capacity of the semiconductor materials, thereby improving the photocatalytic performance. This work reports two-dimensional −H/−OH terminal-substituted siligenes (gersiloxenes) with tunable bandgap. All gersiloxenes are direct-gap semiconductors and have wide range of light absorption and suitable band positions for light driven water reduction into H 2 , and CO 2 reduction to CO under mild conditions. The gersiloxene with the best performance can provide a maximum CO production of 6.91 mmol g −1 h −1 , and a high apparent quantum efficiency (AQE) of 5.95% at 420 nm. This work may open up new insights into the discovery, research and application of new two-dimensional materials in photocatalysis.

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Boosting thermoelectric performance of p-type SiGe alloys through in-situ metallic YSi2 nanoinclusions

Cited by 88 publications

References 45 publications

Odyssey of thermoelectric materials: foundation of the complex structure

Odyssey of thermoelectric materials: foundation of the complex structure

Thermoelectric power factor of nanocomposite materials from two-dimensional quantum transport simulations

Two-dimensional gersiloxenes with tunable bandgap for photocatalytic H2 evolution and CO2 photoreduction to CO

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