TY - JOUR
T1 - Ordered sphalerite derivative Cu5Sn2S7
T2 - A degenerate semiconductor with high carrier mobility in the Cu-Sn-S diagram
AU - Pavan Kumar, Ventrapati
AU - Lemoine, Pierric
AU - Carnevali, Virginia
AU - Guélou, Gabin
AU - Lebedev, Oleg I.
AU - Boullay, Philippe
AU - Raveau, Bernard
AU - Al Rahal Al Orabi, Rabih
AU - Fornari, Marco
AU - Prestipino, Carmelo
AU - Menut, Denis
AU - Candolfi, Christophe
AU - Malaman, Bernard
AU - Juraszek, Jean
AU - Guilmeau, Emmanuel
N1 - Funding Information:
The authors gratefully thank Christelle Bilot and Jerôme Lecourt for technical support. The authors acknowledge SOLEIL for provision of synchrotron radiation facilities and would like to thank Andrea Zitolo and Gautier Landrot for assistance in using beamline SAMBA. The authors acknowledge the nancial support of the French Agence Nationale de la Recherche LabEx EMC3 through the Project FACTO (Grant No. ANR-10-LABX-09-01), the Normandy Region (Réseau d'Intérêt Normand – Label d'excellence), CARNOT ESP and FEDER.
Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2021/5/7
Y1 - 2021/5/7
N2 - Regardless of the complexity of the phase diagram of the Cu-Sn-S system, several compositions near the prototypical mohite Cu2SnS3 have arisen as potential non-toxic, earth-abundant and cost-efficient photovoltaic and thermoelectric materials. In this work, we revisited the Cu2+xSn1-xS3 system and discovered a monoclinic (C2) ordered sphalerite derivative member, Cu5Sn2S7. Using a combination of synchrotron diffraction and spectroscopy, transmission electron microscopy, precession-assisted electron diffraction tomography, Mössbauer spectroscopy, first principles calculations and transport properties measurements, we discuss the structure-thermoelectric properties relationships and clarify the interesting crystal chemistry in this system. The ternary sulfide Cu5Sn2S7 exhibits a degenerate semiconducting behavior with exceptionally high hole mobility originating from the interplay between atomic ordering and charge delocalization.
AB - Regardless of the complexity of the phase diagram of the Cu-Sn-S system, several compositions near the prototypical mohite Cu2SnS3 have arisen as potential non-toxic, earth-abundant and cost-efficient photovoltaic and thermoelectric materials. In this work, we revisited the Cu2+xSn1-xS3 system and discovered a monoclinic (C2) ordered sphalerite derivative member, Cu5Sn2S7. Using a combination of synchrotron diffraction and spectroscopy, transmission electron microscopy, precession-assisted electron diffraction tomography, Mössbauer spectroscopy, first principles calculations and transport properties measurements, we discuss the structure-thermoelectric properties relationships and clarify the interesting crystal chemistry in this system. The ternary sulfide Cu5Sn2S7 exhibits a degenerate semiconducting behavior with exceptionally high hole mobility originating from the interplay between atomic ordering and charge delocalization.
UR - http://www.scopus.com/inward/record.url?scp=85105594688&partnerID=8YFLogxK
U2 - 10.1039/d1ta01615f
DO - 10.1039/d1ta01615f
M3 - Article
AN - SCOPUS:85105594688
VL - 9
SP - 10812
EP - 10826
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
SN - 2050-7488
IS - 17
ER -