Effect of the precursor's stoichiometry on the optoelectronic properties of methylammonium lead bromide perovskites

Giulia J Longo (1) , Alan Wong (2) , Michele J Sessolo (1) , Henk J Bolink (1)

1 ICMol - Instituto de Ciencia Molecular
2 LSDRM - Laboratoire Structure et Dynamique par Résonance Magnétique (LCF)

Methylammonium lead bromide (MAPbBr 3) perovskites have been widely studied in applications such as lasers and light-emitting diodes, thanks to their favorable bandgap, efficient charge transport, and the possibility of processing by simple solution methods. The film morphology has a large impact on the optical and electronic properties of the material; hence the deposition methods and the type of precursors used are crucial in the preparation of efficient optoelectronic devices. Here we studied the effect of the precursor´s stoichiometry of solution processed MAPbBr 3 thin films on their optical and electronic properties. We found a drastic effect of the stoichiometry on the resulting thin film morphology, and suggest the use of excess MA cations to enhance the photo-and electroluminescence of hybrid perovskites.

Domains: Chemical Sciences; Material chemistry

Giulia J Longo, Alan Wong, Michele J Sessolo, Henk J Bolink. Effect of the precursor's stoichiometry on the optoelectronic properties of methylammonium lead bromide perovskites. Journal of Luminescence, 2017, 189, pp.120-125. ⟨10.1016/j.jlumin.2017.03.048⟩. ⟨cea-01496886⟩