Tin Diselenide Molecular Precursor for Solution‐Processable Thermoelectric Materials

In the present work, we detail a fast and simple solution‐based method to synthesize hexagonal SnSe2 nanoplates (NPLs) and their use to produce crystallographically textured SnSe2 nanomaterials. We also demonstrate that the same strategy can be used to produce orthorhombic SnSe nanostructures and na...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2018-12, Vol.57 (52), p.17063-17068
Main Authors: Zhang, Yu, Liu, Yu, Lim, Khak Ho, Xing, Congcong, Li, Mengyao, Zhang, Ting, Tang, Pengyi, Arbiol, Jordi, Llorca, Jordi, Ng, Ka Ming, Ibáñez, Maria, Guardia, Pablo, Prato, Mirko, Cadavid, Doris, Cabot, Andreu
Format: Article
Language:English
Subjects:
Charge transport
Crystallography
Electrical resistivity
Enginyeria química
Figure of merit
Heat transport
Hot pressing
Materials termoelèctrics
modulation doping
modulation doping nanomaterial reactive ink SnSe2 thermoelectricity
nanomaterial
Nanomaterials
Nanoparticles
Nanotechnology
reactive ink
Screw dislocations
SnSe2
Thermoelectric materials
thermoelectricity
Àrees temàtiques de la UPC
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Summary:In the present work, we detail a fast and simple solution‐based method to synthesize hexagonal SnSe2 nanoplates (NPLs) and their use to produce crystallographically textured SnSe2 nanomaterials. We also demonstrate that the same strategy can be used to produce orthorhombic SnSe nanostructures and nanomaterials. NPLs are grown through a screw dislocation‐driven mechanism. This mechanism typically results in pyramidal structures, but we demonstrate here that the growth from multiple dislocations results in flower‐like structures. Crystallographically textured SnSe2 bulk nanomaterials obtained from the hot pressing of these SnSe2 structures display highly anisotropic charge and heat transport properties and thermoelectric (TE) figures of merit limited by relatively low electrical conductivities. To improve this parameter, SnSe2 NPLs are blended here with metal nanoparticles. The electrical conductivities of the blends are significantly improved with respect to bare SnSe2 NPLs, what translates into a three‐fold increase of the TE Figure of merit, reaching unprecedented ZT values up to 0.65. Thermoelectrics: A fast and simple solution‐based method is presented to synthesize flower‐like SnSe2 nanostructures and crystallographically textured SnSe2 nanomaterials, which display highly anisotropic charge and heat transport properties. Unprecedented thermoelectric performance of SnSe2 is achieved through modulation doping by combining SnSe2 nanoplates with metal nanoparticles.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201809847