Ligand-mediated synthesis of colloidal Cs2SnI6 three-dimensional nanocrystals and two-dimensional nanoplatelets

Yanmei Xu*, Songtao Li, Zhilong Zhang, Yicong Hu, Lin Yuan, Weijian Chen, Zihan Chen, Robert Patterson, Shujuan Huang

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number295601
Number of pages10
JournalNanotechnology
Volume30
Issue number29
DOIs
Publication statusPublished - 19 Jul 2019
Externally publishedYes

Keywords

  • synthesis of Cs₂SnI₆
  • 2D nanoplatelets
  • 3D nanoparticles
  • inorganic layer
  • organic layer
  • photoluminescence

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