Toppling the Transport Properties with Cationic Overstoichiometry in Thermoelectric Colusite: [Cu 26 Cr 2 Ge 6 ] 1+δ S 32

The excellent thermoelectric properties of colusite are known to be closely related to the nature of the cations at the core of the tetrahedral-octahedral complexes. Here, we demonstrate that cation overstoichiometry decreases the carrier concentration and also generates structural disorder, which m...

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Bibliographic Details
Published inACS applied energy materials Vol. 3; no. 5; pp. 4180 - 4185
Main Authors Guélou, Gabin, Pavan Kumar, Ventrapati, Bourhim, Abdelhamid, Lemoine, Pierric, Raveau, Bernard, Supka, Andrew, Lebedev, Oleg I., Al Rahal Al Orabi, Rabih, Fornari, Marco, Suekuni, Koichiro, Guilmeau, Emmanuel
Format Journal Article
LanguageEnglish
Published ACS 26.05.2020
Subjects
Chemical Sciences
Sulfide
Off-stoichiometry
Transport mechanism
Colusite
Thermoelectric
Conductive network
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Summary:The excellent thermoelectric properties of colusite are known to be closely related to the nature of the cations at the core of the tetrahedral-octahedral complexes. Here, we demonstrate that cation overstoichiometry decreases the carrier concentration and also generates structural disorder, which modify the conduction mechanism in a way that resembles the effect of cation-size mismatch. This functionalization of the "Cu26S32" conductive network leads to a high figure of merit of 1.0 at 700 K. This study highlights the importance of the cationic arrangement and furthers our understanding on the fascinating transport properties in colusite.
ISSN:2574-0962
2574-0962
DOI:10.1021/acsaem.0c00726