H/F Substitution Achieved Enantiomeric Organic Inorganic Hybrid Perovskites and Trigonal Structure [DMFP]₃(CdBr₃)(CdBr₄)

Crystal structure, semiconducting and photoluminescence (PL) properties of hybrid tin perovskite-like materials: [Cl–(CH2)2–NH3]2SnCl6 and [Cl–(CH2)2–NH3]2SnBr5.65Cl0.35

“…Moreover, H/F substitution-induced chirality in organic cations triggers their inherent unique characteristics, such as nonlinear optical behaviour. 36 In addition, employing ammonium cations such as 3-fluoro- N -methylbenzylammonium [FC 6 H 4 CH 2 NH 2 CH 3 ] into tin halides SnX 6 offers structural flexibility and therefore exploring their properties in optoelectronic devices. 37 Indeed, these structural features involve a significantly reduced band gap as in hybrid halides: [FC 6 H 4 CH 2 NH 2 CH 3 ]SnCl 6 ( E g = 4.24 eV) and [FC 6 H 4 CH 2 NH 2 CH 3 ]SnBr 6 ( E g = 2.58 eV).…”

Homochiral hybrid hexagonal antiperovskite crystals [R- and S-3-chloroquinuclidinium]3(CdCl3)(CdCl4)

“…36 Further, a trigonal antiperovskite crystal of racemic [ N , N -dimethyl-3-fluoropyrrolidinium] 3 (CdBr 3 )(CdBr 4 ) was synthesized and reported with ferroelasticity, different from the enantiomeric [ N , N -dimethyl-3-fluoropyrrolidinium] 3 CdBr 3 perovskites. 37 However, synthetic strategies for hybrid antiperovskites are still inadequate, and further discovery of hybrid antiperovskite structures with desired functional features remains a challenge. Very recently, a chiral strategy for homochiral hybrid perovskite ferroelectrics has shown tremendous potential for the highly efficient development of promising multifunctional optoelectronic devices.…”