E. A. Kravchenko, A. A. Gippius, A. V. Tkachev, M. V. Mastryukov, M. N. Brekhovskikh, “The impact of the SnI2 purity on the formation of CsSnI3 perovskite modifications as monitored by 127I Nuclear Quadrupole Resonance”, Mendeleev Commun., 2023, Volume 33, Issue 2,Pages 282

Communications

The impact of the SnI₂ purity on the formation of CsSnI₃ perovskite modifications as monitored by ¹²⁷I Nuclear Quadrupole Resonance

E. A. Kravchenko^a, A. A. Gippius^bc, A. V. Tkachev^b, M. V. Mastryukov^a, M. N. Brekhovskikh^a

^a N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation
^b P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russian Federation
^c Department of Physics, M.V. Lomonosov Moscow State University, Moscow, Russian Federation

Abstract: The relative content of the perovskite phase in two CsSnI₃ samples (of 99.900 and 99.999 wt% SnI₂ and 99.999 wt% CsI purity) was estimated using ¹²⁷I NQR. The results showed that both samples contained the non-perovskite orthorhombic phase as an admixture. In the sample of higher purity (99.999 wt%) its content was insignificant – only trace amounts could be observed at 77 K, whereas at room temperature the presence of the non-perovskite phase was not revealed. However, in the sample of 99.900 wt% purity the content of the non-perovskite phase has reached at least a third of the sample amount, which is due to the probable crystallization of the non-perovskite phase on impurities.

Keywords: nuclear quadrupole resonance, impurities, perovskites, purification, tin iodide.

Language: English

DOI: 10.1016/j.mencom.2023.02.043