A hybrid organic-inorganic compound, (pyrrolidinium)MnBr3 , distinguished from rare earth (RE)-doped inorganic perovskites, is discovered as a new member of the ferroelectrics family, having excellent luminescent properties and relatively large spontaneous polarization of 6 μC cm(-2) , as well as a weak ferromagnetism at about 2.4 K. With a quantum yield of >28% and emission lifetime >0.1 ms, such multiferroic photoluminescence is a suitable candidate for future applications in luminescence materials, photovoltaics, and magneto-optoelectronic devices.

Tin-based halide perovskite materials have been successfully employed in lead-free perovskite solar cells,b ut the overall power conversion efficiencies (PCEs) have been limited by the high carrier concentration from the facile oxidation of Sn 2+ to Sn 4+ .N ow ac hemical route is developed for fabrication of high-quality methylammonium tin iodide perovskite (MASnI 3 )f ilms:h ydrazinium tin iodide (HASnI 3 ) perovskite film is first solution-deposited using presursors hydrazinium iodide (HAI) and tin iodide (SnI 2 ), and then transformed into MASnI 3 via acation displacement approach. With the two-step process,adense and uniform MASnI 3 film is obtained with large grain sizes and high crystallization. Detrimental oxidation is suppressed by the hydrazine released from the film during the transformation. With the MASnI 3 as light harvester,m esoporous perovskite solar cells were prepared, and amaximum power conversion efficiency (PCE) of 7.13 %i sdelivered with good reproducibility.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

An S-heterocyclic annelated perylene bisimide (PBI) has been prepared from readily available tetrachloro-PBI by a one-step palladium-catalyzed reaction; when co-crystallized with pyrene it gives a unique columnar arrangement of 1 : 2 complexes.