Journal
NANOTECHNOLOGY
Volume 30, Issue 29, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab13f6
Keywords
synthesis of Cs2SnI6; 2D nanoplatelets; 3D nanoparticles; inorganic layer; organic layer; photoluminescence
Funding
- Fundamental Research Funds for the Central Universities [2018MS133, 2016YQ11, 2016MS134, 2017MS198]
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Cs2SnI6 is a variant on tin-iodide solution-processable materials and may lead to a lead-free material for use in next-generation photovoltaic cells and other optoelectronics. So far, only a few studies have been conducted where shape and geometry control of Cs2SnI6 nanocrystals is demonstrated. Here we report a general approach to directly synthesize Cs2SnI6 of two-dimensional (2D) layered nanoplatelets as well as three-dimensional (3D) nanocrystals. The shape of Cs2SnI6 nanocrystals could be engineered into 3D nanoparticles and different 2D nanoplatelets with well-defined morphology by choosing different organic acid and amine ligands via a hot injection process. Moreover, the thickness of layered 2D nanoplatelets could be adjusted by changing the amount of Cs-oleate present during the synthesis. The photoluminescence emission peaks changed from 643 to 742 nm based on nanomaterial shape. Our method provides a facile and versatile route to rationally control the shape of the Cs2SnI6 nanocrystals, which will create opportunities for applications in lead-free optoelectronics.
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