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Recent progress in p-type thermoelectric magnesium silicide based solid solutions

de Boor, Johannes and Dasgupta, Titas and Saparamadu, U. and Müller, Eckhard and Ren, Z.F. (2017) Recent progress in p-type thermoelectric magnesium silicide based solid solutions. Materials Today Energy, pp. 105-121. ISSN 2468-6069

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Abstract

Thermoelectric materials can convert waste or process heat directly into usable electrical energy. They are therefore a fascinating opportunity to increase the energy efficiency of various industrial processes and thus reduce fossil fuel consumption. For the temperature range of 500 K-800 K where a large fraction of the reusable heat is available magnesium silicide based solid solutions are among the most promising thermoelectric materials. They combine very good thermoelectric properties with a high material availability, low cost of raw materials, and environmental compatibility making them suitable for large scale applications. The thermoelectric properties of the n-type material have been found superior to the p-type. However, a p-type material with good thermoelectric properties is indispensable for a practical application of magnesium silicide based thermoelectric generators. Due to progress in synthesis techniques and the identification of efficient dopants there has been significant progress in the optimization of the p-type, resulting in several reports with a thermoelectric figure of merit exceeding 0.5. We analyze experimental data and theoretical results and rationalize the recent progress. In particular we investigate the interplay between thermoelectric properties and composition, electronic band structure, and the effect of doping by various elements. Overall we find that the optimization of p-type Mg2X requires consideration of more parameters than the n-type material. Achieving the optimum carrier concentration is experimentally challenging and depends on the dopant species as well as the Si:Ge:Sn ratio in the compounds. Although debated frequently, the overwhelming majority of the data indicates a rigid electronic band structure for the most popular dopants Ag, Si, Li, and Na. On the other hand, the doping efficiency differs between the dopants as well as the corresponding hole mobilities. Further progress in the material development can be expected if the various defect densities can be controlled and the bipolar effect can be decreased further.

Item URL in elib:https://elib.dlr.de/115068/
Document Type:Article
Title:Recent progress in p-type thermoelectric magnesium silicide based solid solutions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
de Boor, Johannesgerman aerospace center, institute of materials research, köln, germanyhttps://orcid.org/0000-0002-1868-3167
Dasgupta, Titasdepartment of metallurgical engineering and materials science, indian institute of technology bombay, mumbai 400076, indiaUNSPECIFIED
Saparamadu, U.department of physics and texas center for superconductivity, university of houston, houston, tx 77204, usaUNSPECIFIED
Müller, Eckhardgerman aerospace center, institute of materials research, köln, germany and justus liebig university giessen, institute of inorganic and analytical chemistry, 35392 giessen, germanyUNSPECIFIED
Ren, Z.F.department of physics and texas center for superconductivity, university of houston, houston, tx 77204, usaUNSPECIFIED
Date:2 May 2017
Journal or Publication Title:Materials Today Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Page Range:pp. 105-121
ISSN:2468-6069
Status:Published
Keywords:p-type, Thermoelectric, Magnesium Silicide, Solid solution
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Systemtechnologien
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Yasseri, Mohammad
Deposited On:22 Nov 2017 10:20
Last Modified:16 Feb 2018 12:40

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