Enhancing thermoelectric properties of p-type SiGe alloy through optimization of carrier concentration and processing parameters

Wongprakarn, Suphagrid; Pinitsoontorn, Supree; Tanusilp, Sora‐at; Kurosaki, Ken

doi:10.1016/j.mssp.2018.08.020

Cited by 22 publications

(21 citation statements)

References 41 publications

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“…Materials with an ideal ratio of Si 80 Ge 20 have been found and widely studied. In SiGe alloys, the large difference in the mean free path between electron (approximately 5 nm) and phonon (approximately 200–300 nm) contributions leads to a strong influence of nanostructuring in a range of 10–100 nm, which reduces the thermal conductivity without significantly reducing the electrical conductivity [ 182 ]. Therefore, nanostructuring [ 183 , 184 , 185 ] and the use of nanoinclusions [ 184 , 186 , 187 , 188 , 189 ] are common strategies to further improve the thermoelectric properties of SiGe alloys.…”

Section: Metals and Intermetallicsmentioning

confidence: 99%

“…Therefore, nanostructuring [ 183 , 184 , 185 ] and the use of nanoinclusions [ 184 , 186 , 187 , 188 , 189 ] are common strategies to further improve the thermoelectric properties of SiGe alloys. For preparation of SiGe alloys, solid-state ball milling [ 180 , 183 , 186 , 187 , 190 , 191 , 192 , 193 , 194 ] or melt spinning (MS) [ 182 , 189 ] in combination with subsequent SPS are commonly used. Bathula et al [ 192 ] reported a peak zT of 1.72 with a power factor of 28.7

W cm −1 K −2 for n -doped Si 80 Ge 20 with SiC nanoinclusions.…”

Section: Metals and Intermetallicsmentioning

confidence: 99%

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High Power Factor vs. High zT—A Review of Thermoelectric Materials for High-Temperature Application

Wolf

Hinterding

Feldhoff

2019

Entropy

143

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Energy harvesting with thermoelectric materials has been investigated with increasing attention over recent decades. However, the vast number of various material classes makes it difficult to maintain an overview of the best candidates. Thus, we revitalize Ioffe plots as a useful tool for making the thermoelectric properties of a material obvious and easily comparable. These plots enable us to consider not only the efficiency of the material by the figure of merit zT but also the power factor and entropy conductivity as separate parameters. This is especially important for high-temperature applications, where a critical look at the impact of the power factor and thermal conductivity is mandatory. Thus, this review focuses on material classes for high-temperature applications and emphasizes the best candidates within the material classes of oxides, oxyselenides, Zintl phases, half-Heusler compounds, and SiGe alloys. An overall comparison between these material classes with respect to either a high efficiency or a high power output is discussed.

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Section: Metals and Intermetallicsmentioning

confidence: 99%

W cm −1 K −2 for n -doped Si 80 Ge 20 with SiC nanoinclusions.…”

Section: Metals and Intermetallicsmentioning

confidence: 99%

High Power Factor vs. High zT—A Review of Thermoelectric Materials for High-Temperature Application

Wolf

Hinterding

Feldhoff

2019

Entropy

143

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“…High performance SiGe alloys depicting (A) its reduced κ t and (B) enhanced ZT via miscellaneous optimization techniques at different temperature range …”

Section: High Performance Inorganic Te Materialsmentioning

confidence: 99%

Inorganic thermoelectric materials: A review

et al. 2020

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Summary Thermoelectric generator, which converts heat into electrical energy, has great potential to power portable devices. Nevertheless, the efficiency of a thermoelectric generator suffers due to inefficient thermoelectric material performance. In the last two decades, the performance of inorganic thermoelectric materials has been significantly advanced through rigorous efforts and novel techniques. In this review, major issues and recent advancements that are associated with the efficiency of inorganic thermoelectric materials are encapsulated. In addition, miscellaneous optimization strategies, such as band engineering, energy filtering, modulation doping, and low dimensional materials to improve the performance of inorganic thermoelectric materials are reported. The methodological reviews and analyses showed that all these techniques have significantly enhanced the Seebeck coefficient, electrical conductivity, and reduced the thermal conductivity, consequently, improved ZT value to 2.42, 2.6, and 1.85 for near‐room, medium, and high temperature inorganic thermoelectric material, respectively. Moreover, this review also focuses on the performance of silicon nanowires and their common fabrication techniques, which have the potential for thermoelectric power generation. Finally, the key outcomes along with future directions from this review are discussed at the end of this article.

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“…Furthermore, the large operating temperature difference has its own contribution, but ultimately it is all about the material's ability to convert heat and generate usefule lectric power. Recently, many new classes of materials,s uch as metal sulfides, [10] selenides, [11] half-Heusler compounds, [12] filled skutterudites, [13] clathrates, [14] oxides, [15] organic or polymer materials, [16] Zintl compounds, [17] and carbon-based compounds, [18] have been introduced with promising properties that give new hopes for the future of thermoelectric technology.F urthermore, strategies such as doping, [19] nanostructuring, [20] alloying, [21] resonant level filling, [22] and band engineering [23] have also been successful in improving the ZT value of the materials. [9] They were preferred for such applications even thought he conversion efficiency was very low because of to their ability to reliably generate poweri nr emote areas without any need for complex technology.D uring 21st century,b etter thermoelectric materials have been developed that are able to expand application of such devices.…”

Section: Thermoelectric Generatorsmentioning

confidence: 99%

“…[9] Earlier,o nly af ew wellknown thermoelectric materials were being used for making thermoelectric generators, which limited their use. Recently, many new classes of materials,s uch as metal sulfides, [10] selenides, [11] half-Heusler compounds, [12] filled skutterudites, [13] clathrates, [14] oxides, [15] organic or polymer materials, [16] Zintl compounds, [17] and carbon-based compounds, [18] have been introduced with promising properties that give new hopes for the future of thermoelectric technology.F urthermore, strategies such as doping, [19] nanostructuring, [20] alloying, [21] resonant level filling, [22] and band engineering [23] have also been successful in improving the ZT value of the materials. For example,m any studies have shown clear improvements in the ZT values of bulk materials by just bringing them to nanostructured dimensions.…”

Section: Thermoelectric Generatorsmentioning

confidence: 99%

Powering the Hydrogen Economy from Waste Heat: A Review of Heat‐to‐Hydrogen Concepts

Mulla

Dunnill

2019

ChemSusChem

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Ever‐increasing energy demands and environmental concerns require new and clean energy supplies, many of which are intermittent and do not correlate with demand. To balance supply with demand, a universal energy vector should be employed such that intermittent renewable energy can be stored and transported and then used when needed. Hydrogen is the perfect universal energy vector and a possible solution that ensures environmental cleanliness, maximum utilization of renewable energy sources, and high efficiency, whereby the combustion of the fuel yields only water. One abundant and freely available energy source—both anthropogenic and natural—is heat. Heat can be obtained from industrial processes and is indeed often viewed as a waste product with a premium to remove but is notoriously difficult to capture, store, and transport. Capturing and storing low‐grade heat therefore provides a significant opportunity and can be achieved by coupling thermoelectric generators and water electrolyzers. A thermoelectric generator is placed within a thermal energy gradient and produces a flow of current that is fed to the electrolysis unit with which it produces hydrogen and oxygen as the final products. The hydrogen can be stored for long periods and transported for “on‐demand” use in fuel cells for electricity from hydrogen burners for a return to thermal energy. This Review summarizes the current state‐of‐the‐art research into implementing thermoelectric generators and utilizing heat as a primary energy source to produce hydrogen, which could replace the need for extra electric power to run hydrogen production units. Furthermore, suitable requirements, modifications, and other related aspects associated with such a new and novel method of hydrogen generation are discussed. Hydrogen produced from otherwise‐wasted energy sources can be considered to be green.

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Enhancing thermoelectric properties of p-type SiGe alloy through optimization of carrier concentration and processing parameters

Cited by 22 publications

References 41 publications

High Power Factor vs. High zT—A Review of Thermoelectric Materials for High-Temperature Application

High Power Factor vs. High zT—A Review of Thermoelectric Materials for High-Temperature Application

Inorganic thermoelectric materials: A review

Powering the Hydrogen Economy from Waste Heat: A Review of Heat‐to‐Hydrogen Concepts

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