Enhancing thermoelectric performance in GeTe through Ge enrichment regulation and AgCuTe alloying

Lyu, Jingyi; Li, Jingfeng; Yang, Wenwei; Chen, Zhixing; Ren, Zijie; Zhao, Zhanpeng; Liu, Shenghua; Shuai, Jing

doi:10.1016/j.cej.2024.149695

Chemical Engineering Journal

2024

DOI: 10.1016/j.cej.2024.149695

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Enhancing thermoelectric performance in GeTe through Ge enrichment regulation and AgCuTe alloying

Jingyi Lyu,

Jingfeng Li,

Wenwei Yang

et al.

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2024

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Cited by 4 publications

References 49 publications

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Defect Engineering Realizes Superior Thermoelectric Performance of GeTe

Wu,

Cai,

Chen

et al. 2024

Adv Funct Materials

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GeTe has been considered as a promising mid‐temperature thermoelectric (TE) candidate, but its zT value is severely limited by the excessive hole concentration and high thermal conductivity. Here, it is demonstrated that the TE properties of GeTe can be significantly improve by defect engineering of Sb‐Pb and AgCuTe codoping. The Sb‐Pb codoping is adopted to optimize the carrier concentration and manipulate the rhombohedral lattice distortion, leading to valence band convergence and enhanced power factor. The AgCuTe alloying introduces multiscale phonon scattering centers including dislocations and nano‐precipitates to reduce the lattice thermal conductivity in GeTe. Consequently, a maximum zT of 2.3 at 773 K and an average zT of 1.43 (300–773 K) are obtained in (Ge0.84Sb0.06Pb0.1Te)0.99(AgCuTe)0.01. Moreover, the fabricated thermoelectric module exhibits a high output power density of 0.59 W cm–2 and an energy conversion efficiency of 7.9% at ΔT = 500 K, suggesting hierarchical defect engineering is an effective strategy to realize high‐performance GeTe‐based thermoelectric.

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Defect Engineering Realizes Superior Thermoelectric Performance of GeTe

Wu,

Cai,

Chen

et al. 2024

Adv Funct Materials

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Advancement of germanium-based thermoelectric materials: a bibliometric and network analysis

Gupta,

Sharma,

Batra

2024

Phys. Scr.

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Germanium (Ge)-based thermoelectric materials have proven to be a reliable and sustainable solution for efficient energy harvesting across a wide range of temperatures for an extended period. Numerous investigations have been published addressing the future scope of Ge as a thermoelectric material. This article offers a comprehensive bibliometric analysis of the literature related to Germanium-based thermoelectric energy harvesting (Ge-TEH) materials available on Scopus to identify how this material contributes to thermoelectric energy generation. Methodologies such as citation analysis, co-authorship, and co-occurrence analysis are employed to analyze refined data of „1867‟ documents using VOS viewer and Biblioshiny. The analysis shows that Ge-TEH has grown significantly worldwide, especially in the last decade. The social and intellectual networks were generated, and the most influencing countries, sources, and institutions were identified. China and the United States (USA) were found to have the highest number of publications, citations, and collaborations. The keywords analysis reveals that „lattice thermal conductivity,' „Germanium,' „Seebeck coefficient,' „spark plasma sintering', and 'density functional theory‟ are the most occurring words, indicating that the dataset features keywords related to thermoelectric materials and their properties. It also suggests a strong emphasis on fabrication methods for optimizing thermoelectric properties. The mutual relevance and categorical patterns of frequently occurring keywords were studied using a factorial analysis graph. This detailed analysis provides critical findings into the evolution and future scope of the research in Ge-TEH.

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Advancements in Ge-based thermoelectric materials for efficient waste heat energy conversion: a comprehensive review

Gupta,

Batra

2024

Phys. Scr.

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Thermoelectric materials hold significant promise for converting waste heat energy into electrical energy. The performance of these materials and devices is assessed using a quantitative measure known as the figure of merit, which relies on the Seebeck coefficient, thermal conductivity, and electrical conductivity of the material. Extensive efforts have been devoted to enhancing the efficiency of thermoelectric materials and devices through various techniques such as doping, nanostructuring, electron energy filtering, and band engineering. This paper presents a comprehensive review encompassing various thermoelectric materials, including organic, inorganic, intermetallic, complex cell structures, hybrid, and notably Germanium-based materials. Ge, due to its easy availability, low cost, high Seebeck coefficient, and high thermal stability, emerges as a suitable candidate for thermoelectric energy generation. Among the Ge-based materials studied, (Sb2Te3)0.5(Ge0.91Pb0.09Te)17.5 gave the highest figure of merit, with values of approximately 2.4 at 773 K. These findings underscore the significant potential of GeTe alloy in thermoelectric energy harvesting. This review provides an overview of the latest developments in thermoelectric materials, focusing on different strategies to enhance thermoelectric performance. Additionally, the suitability of various Ge-based thermoelectric materials for energy harvesting applications is extensively discussed in this review.

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Enhancing thermoelectric performance in GeTe through Ge enrichment regulation and AgCuTe alloying

Cited by 4 publications

References 49 publications

Defect Engineering Realizes Superior Thermoelectric Performance of GeTe

Defect Engineering Realizes Superior Thermoelectric Performance of GeTe

Advancement of germanium-based thermoelectric materials: a bibliometric and network analysis

Advancements in Ge-based thermoelectric materials for efficient waste heat energy conversion: a comprehensive review

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