Investigation of Mn Single and Co-Doping in Thermoelectric CoSb3-Skutterudite: A Way Toward a Beneficial Composite Effect
Source abstract
Abstract
High Resolution Image Download MS PowerPoint Slide We report here the first in-depth theoretical and experimental investigations of Mn substitution within the CoSb 3 -skutterudite. A systematic and comprehensive approach was employed to first determine the feasibility of single/cosubstitution for Mn with Te and then assess its effect. Subsequently, experimental realization of the samples was conducted. We were able to highlight a low solubility limit of Mn as a single dopant and provide evidence that the substitution stabilizes p -type conduction, as predicted via density functional theory calculations. Then, we reveal the prevalent formation of the composite MnTe/CoSb 3 -skutterudite phases instead of the expected favorable cosubstitution. This unexpected composite formation induces a beneficial effect, maximizing the Seebeck coefficient and leading to a record power factor (PF) of ≈ 4.7 mW/m K 2 at 725 K for an unfilled skutterudite compound (PF = S 2 σ with S, Seebeck coefficient; σ, electrical conductivity).
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Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Semiconductor materials and interfaces · Chalcogenide Semiconductor Thin Films
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
WPI-MANA, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
Electron Microscopy Analysis Station/High-Resolution Group, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
CNRS-Saint Gobain-NIMS, IRL 3629, Laboratory for Innovative Key Materials and Structures (LINK), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
CNRS, Institut des Matériaux de Nantes Jean Rouxel, IMN, Nantes Université, F-44000 Nantes, France
Funding
JST-Mirai Program
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