Highly Stable Two-Dimensional Tin(II) Iodide Hybrid Organic–Inorganic Perovskite Based on Stilbene Derivative

In Hyeok Park, Leiqiang Chu, Kai Leng, Yu Fong Choy, Wei Liu, Ibrahim Abdelwahab, Ziyu Zhu, Zhirui Ma, Wei Chen, Qing Hua Xu, Goki Eda, Kian Ping Loh

Research output: Journal article publicationJournal articleAcademic researchpeer-review

55 Citations (Scopus)


Hybrid organic–inorganic perovskites have recently emerged as potential disruptive photovoltaic technology. However, the toxicity of lead used in state-of-the-art hybrid perovskites solar cell prevents large-scale commercialization, which calls for lead-free alternatives. Sn-based perovskites have been considered as alternatives but they are limited by rapid oxidation and decomposition in ambient air. Here, an Sn-based two-dimensional hybrid organic–inorganic perovskites [A2B( n -1)SnnI(3 n +1)] (n = 1 and 2) are reported with improved air stability, using bulky stilbene derivatives as the organic cations (2-(4-(3-fluoro)stilbenyl)ethanammonium iodide (FSAI)). The moisture stability of the [(FSA)2SnI4] perovskites is attributed to the hydrophobic properties of fluorine-functionalized organic chains (FSA), as well as the strong cohesive bonding in the organic chains provided by H bonds, CH···X type H bonds, weak interlayer F···F interaction, and weak face-to-face type π-π interactions. The photodetector device fabricated on exfoliated single crystal flake of [(FSA)2SnI4] exhibits fast and stable photoconductor response.

Original languageEnglish
Article number1904810
JournalAdvanced Functional Materials
Issue number39
Publication statusPublished - 26 Sept 2019
Externally publishedYes


  • 2D material
  • hybrid perovskite
  • stability
  • stilbene
  • tin(II) iodide

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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