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Thermoelectric Materials: Progress and Their Applications
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Thermoelectric Materials: Progress and Their Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Smart Materials".

Deadline for manuscript submissions: closed (20 January 2024) | Viewed by 5315

Special Issue Editors

Dr. Shakeel Ahmad Khandy

E-Mail Website
Guest Editor
ZJU-Hangzhou Global Scientific and Technological Innovation Center, School of Micro-Nano Electronics, Zhejiang University, Hangzhou 311200, China
Interests: electronic structure; thermoelectrics; Heusler alloys; 2D materials; perovskites; phonons; structural stability; semiconductors
Dr. Ishtihadah Islam

E-Mail Website
Guest Editor
Department of Physics, Jamia Millia Islamia New Delhi, New Delhi 110025, India
Interests: nanomaterials; transition metal oxides; materials characterization; thermoelec-tricity; optical properties

Special Issue Information

Dear Colleagues,

Modern soft-scale and high-tech advancements in device applications include the low cost, lower energy-consuming materials, a prerequisite for the large-scale production in industries and factories. Hence, new and viable methods to reduce the energy consumption or recover the waste heat produced during the operation of these devices are in demand. Eco-friendly thermoelectric materials are, thus, very important to realize the low energy consumption. The efficiency of a TE material is known by its figure of merit (\({ZT=\frac{S^{2}σT}{k}}\)), where S is the Seebeck coefficient, σ is electrical conductivity, T is the absolute temperature and k = kL + kel is total thermal conductivity, which is a mixture of lattice (kL) and electronic (kel) thermal conductivities. Practically, the maximum ZT>3 is reported in SnSe, but there is no limit in the theoretical sense. However, the search for efficient thermoelectric materials with the required low thermal conductivity and a simultaneous maximum power factor or Seebeck coefficient is still ongoing. The efficiency of a thermoelectric device is normally encapsulated in two characteristic features: (i) enhancing electric performance without influencing the thermal transport; (ii) restraining the thermal transport by not adjusting the electronic properties. With the improvements in the first-hand conversion of waste energy into useful electric power (typically from thermal energy), thermoelectric devices illustrate evidence of numerous applications. This phenomenon recapitulates the waste heat in the form of electric potential which, in turn, is castoff in useful batteries and applications. The possible materials include lead tellurides, Heusler alloys, inorganic clathrates, skutterudite, oxide thermoelectrics, compounds of Mg and group-14 elements, etc.

In this issue, we will summarize the recent progress in thermoelectric materials, applications and devices with a keen interest in the physics of materials.

Dr. Shakeel Ahmad Khandy
Dr. Ishtihadah Islam
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • thermoelectrics
  • band engineering
  • Seebeck coefficient
  • power factor
  • thermal conductivity
  • figure of merit
  • phonons

Published Papers (3 papers)

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Research

10 pages, 2906 KiB  
Article
Enhancing the Thermoelectric Performance of GeSb4Te7 Compounds via Alloying Se
by Siyu Wang, Tong Xing, Tian-Ran Wei, Jiawei Zhang, Pengfei Qiu, Jie Xiao, Dudi Ren, Xun Shi and Lidong Chen
Materials 2023, 16(9), 3368; https://doi.org/10.3390/ma16093368 - 25 Apr 2023
Cited by 1 | Viewed by 1524
Abstract
Ge-Sb-Te compounds (GST), the well-known phase-change materials, are considered to be promising thermoelectric (TE) materials due to their decent thermoelectric performance. While Ge2Sb2Te5 and GeSb2Te4 have been extensively studied, the TE performance of GeSb4 [...] Read more.
Ge-Sb-Te compounds (GST), the well-known phase-change materials, are considered to be promising thermoelectric (TE) materials due to their decent thermoelectric performance. While Ge2Sb2Te5 and GeSb2Te4 have been extensively studied, the TE performance of GeSb4Te7 has not been well explored. Reducing the excessive carrier concentration is crucial to improving TE performance for GeSb4Te7. In this work, we synthesize a series of Se-alloyed GeSb4Te7 compounds and systematically investigate their structures and transport properties. Raman analysis reveals that Se alloying introduces a new vibrational mode of GeSe2, enhancing the interatomic interaction forces within the layers and leading to the reduction of carrier concentration. Additionally, Se alloying also increases the effective mass and thus improves the Seebeck coefficient of GeSb4Te7. The decrease in carrier concentration reduces the carrier thermal conductivity, depressing the total thermal conductivity. Finally, a maximum zT value of 0.77 and an average zT value of 0.48 (300–750 K) have been obtained in GeSb4Te5.5Se1.5. This work investigates the Raman vibration modes and the TE performance in Se-alloyed GeSb4Te7 sheddinglight on the performance optimization of other GST materials. Full article
(This article belongs to the Special Issue Thermoelectric Materials: Progress and Their Applications)
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11 pages, 2837 KiB  
Article
Enhancement of Thermoelectric Performance for CuCl Doped P-Type Cu2Sn0.7Co0.3S3
by Dong-Liang Shi and Kwok-Ho Lam
Materials 2023, 16(6), 2395; https://doi.org/10.3390/ma16062395 - 16 Mar 2023
Cited by 2 | Viewed by 1431
Abstract
Cu2SnS3 (CSS) has gained great attraction due to its constitutive earth-abundant elements and intrinsic low lattice thermal conductivity, κl, potentially providing high quality factor, B, and high zT value. However, the lack of band convergence is the bottleneck [...] Read more.
Cu2SnS3 (CSS) has gained great attraction due to its constitutive earth-abundant elements and intrinsic low lattice thermal conductivity, κl, potentially providing high quality factor, B, and high zT value. However, the lack of band convergence is the bottleneck to enhancing the thermoelectric performance of Cu2SnS3 when performing the band engineering. To study the doping effect on the band structure and the thermoelectric performance, the composite Cu2Sn0.7Co0.3S3-xCuCl (x = 0, 0.1, 0.2, 0.3) (CSCS-xCuCl) has been investigated for the first time. The samples showed excellent data repeatability at high temperatures of up to 700 K. It was found that CuCl could compensate the Cu loss, enhance the phonon scattering and minimize the adverse effect on the power factor, PF. The ultralow lattice thermal conductivity could reach 0.38 W m−1 K−1 for the nominal composition of CSCS-0.3CuCl at 700 K. A peak zT of 0.56 (evaluated with no cold finger effect) was realized at 700 K when x = 0.3, which is almost double the performance of pristine samples. Full article
(This article belongs to the Special Issue Thermoelectric Materials: Progress and Their Applications)
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12 pages, 2084 KiB  
Article
Enhanced Thermoelectric Properties of Misfit Bi2Sr2-xCaxCo2Oy: Isovalent Substitutions and Selective Phonon Scattering
by Arindom Chatterjee, Ananya Banik, Alexandros El Sachat, José Manuel Caicedo Roque, Jessica Padilla-Pantoja, Clivia M. Sotomayor Torres, Kanishka Biswas, José Santiso and Emigdio Chavez-Angel
Materials 2023, 16(4), 1413; https://doi.org/10.3390/ma16041413 - 8 Feb 2023
Cited by 2 | Viewed by 1806
Abstract
Layered Bi-misfit cobaltates, such as Bi2Sr2Co2Oy, are the natural superlattice of an electrically insulating rocksalt (RS) type Bi2Sr2O4 layer and electrically conducting CoO2 layer, stacked along the crystallographic c-axis. [...] Read more.
Layered Bi-misfit cobaltates, such as Bi2Sr2Co2Oy, are the natural superlattice of an electrically insulating rocksalt (RS) type Bi2Sr2O4 layer and electrically conducting CoO2 layer, stacked along the crystallographic c-axis. RS and CoO2 layers are related through charge compensation reactions (or charge transfer). Therefore, thermoelectric transport properties are affected when doping or substitution is carried out in the RS layer. In this work, we have shown improved thermoelectric properties of spark plasma sintered Bi2Sr2-xCaxCo2Oy alloys (x = 0, 0.3 and 0.5). The substitution of Ca atoms affects the thermal properties by introducing point-defect phonon scattering, while the electronic conductivity and thermopower remain unaltered. Full article
(This article belongs to the Special Issue Thermoelectric Materials: Progress and Their Applications)
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