Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
Publication date: 18th December 2016
We report a general and effective procedure for the synthesis of NCs and bulk crystals of methylammonium (MA) lead halide perovskites employing N-methylformamide (NMF) as source of MA ions. This procedure takes advantage of the in-situ formation of MA via transamidation with alkylamine or acid-catalyzed hydrolysis of NMF, hence, reducing the amount of work, chemicals toxicity and cost required to realize high quality perovskites. Strongly fluorescent MAPbX3 NCs with photoluminescence quantum yields reaching 74% for MAPbBr3 and 60% for MAPbI3 could be synthesized using NMF and oleylamine by a simple reprecipitation process, without the need of degassing any solvents. Moreover, only through this NMF-hydrolysis strategy, bulk crystals can be grown without heating and without any anti-solvent. In principle, with the method described here, MA ions can be released “on-demand” during a process, for example by increasing the acidity of the medium or by raising the local temperature, which might enable a better control on the fabrication of this important class of materials. These possibilities are currently being studied in our groups.
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