cm8b01906_si_004.cif (1.35 MB)
Solution Processing of Methylammonium Lead Iodide Perovskite from γ‑Butyrolactone: Crystallization Mediated by Solvation Equilibrium
dataset
posted on 2018-07-17, 00:00 authored by Sergey
A. Fateev, Andrey A. Petrov, Victor N. Khrustalev, Pavel V. Dorovatovskii, Yan V. Zubavichus, Eugene A. Goodilin, Alexey B. TarasovThe
chemical origin of solvents typically used for preparation
of hybrid lead halide perovskitesdimethyl sulfoxide (DMSO),
dimethylformamide (DMF), and γ-butyrolactone (GBL)strongly
influences the process of perovskite crystallization because of the
formation of intermediate adducts with different structures and morphology.
The composition and crystal structures of the adducts depend on the
coordination and binding ability of the solvents and the ratio of
the precursors. New adducts of perovskite and GBL with either an unusual
cluster structure, (MA)8(GBL)x[Pb18I44], or an adduct, (MA)2(GBL)2Pb3I8, similar to those observed for
DMF and DMSO are described for the first time. Complex equilibriums
between chemical species existing in perovskite solutions are revealed
by Raman spectroscopy. As a result, new features of the perovskite
crystallization through intermediate adduct phases are discussed,
and effective perovskite deposition pathways are suggested.