Superior Stability and Emission Quantum Yield (23% ± 3%) of Single-Layer 2D Tin Perovskite TEA2SnI4 via Thiocyanate Passivation

Jin Tai Lin, Yu Kai Hu, Cheng Hung Hou, Chen Cheng Liao, Wei Tsung Chuang, Ching Wen Chiu*, Ming Kang Tsai, Jing Jong Shyue, Pi Tai Chou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Tin-based perovskite, which exhibits narrower bandgap and comparable photophysical properties to its lead analogs, is one of the most forward-looking lead-free semiconductor materials. However, the poor oxidative stability of tin perovskite hinders the development toward practical application. In this work, the effect of pseudohalide anions on the stability and emission properties of single-layer 2D tin perovskite nanoplates with chemical formula TEA2SnI4 (TEA = 2-thiophene-ethylammonium) is reported. The results reveal that ammonium thiocyanate (NH4SCN) is the most effective additive in enhancing the stability and photoluminescence quantum yield of 2D TEA2SnI4 (23 ± 3%). X-Ray photoelectron spectroscopic investigations on the thiocyanate passivated TEA2SnI4 nanoplate show less than a 1% increase of Sn4+ signal upon 30 min exposure to air under ambient conditions (298 K, humidity ≈70%). Furthermore, no noticeable decrease in emission intensity of the nanoplate is observed after 20 h in air. The SCN- passivation during the growth stage of TEA2SnI4 is proposed to play a crucial role in preventing the oxidation of Sn2+ and hence boosts both stability and photoluminescence yield of tin perovskite nanoplates.

Original languageEnglish
Article number2000903
Issue number19
Publication statusPublished - 2020 May 1


  • air-stable
  • luminescent materials
  • thiocyanate passivation
  • tin perovskites

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • General Chemistry
  • General Materials Science


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