Two-Dimensional Organic–Inorganic Hybrid Materials with Dielectric Switching and Photoluminescence Properties

Abstract

Layered 2D organic−inorganic halide perovskites have attracted comprehensive scientific attention due to their excellent dielectric, ferroelectric, and photophysical properties. However, most of the reported crystal compounds only possess a single performance. Here, we report two new layered 2D organic− inorganic halide perovskites: [BA-PbBr 4 ] (Prv-1) and [MACH-PbI 4 ] (Prv-2) (BA = 1-butylamine, MACH = cyclohexanemethylamine). Both compounds (with crystal structures) show switchable phase transitions at 390 and 350 K, respectively. Shockingly, [MACH-PbI 4 ] reveals a high photoluminescence quantum yield of up to 16.3% with the replacement of the halogen and organic cation (Br → I, BA → MACH). In addition, the experimental data and calculated results suggest that both compounds could be used as band gap semiconductors. In brief, this work might provide new strategies for the exploration of dielectric and ferroelectric functional materials.

Synthesis and Properties of Stable Amino Metal Halide Molecular Clusters in the Solid State

“…Comparing the BTYA solution with the PbBr 2 /BTYA solution, we find the peaks of the BTYA solution at 398, 797, 1299, and 1441 cm –1 shift to higher vibrational frequencies in the PbBr 2 /BTYA solution. These peaks are ascribed to C–N torsion, NH 2 torsion, C–H 2 twist, and C–H 2 bending, respectively. , This shift in the PbBr 2 /BTYA solution suggests the interaction between the BTYA ligand and PbBr 2 , likely through the amine group …”

“…27,28 This shift in the PbBr 2 /BTYA solution suggests the interaction between the BTYA ligand and PbBr 2 , likely through the amine group. 29 The PbBr 2 -BTYA MCs were characterized in the solid state in the low-Raman vibrational frequency region to determine the vibrational phonon modes of MCs. Figure 4b shows several vibrational peaks at low frequencies on different thicknesses of solid films.…”

Reversible Phase Transition and Second-Harmonic Response Based on a Zero-Dimensional Organic–Inorganic Hybrid Compound

“…32−42 For example, Chen et al reported a new layered perovskite, (4-fluorophenethylaminium) 2 [CuCl 4 ], which shows aboveroom-temperature ferroelasticity, reversible thermochromism, semiconductivity, and low-temperature ferromagnetic ordering. 43 Fu et al reported an organic−inorganic hybrid perovskite, [(BA) 2 −PbI 4 ] (compound 1, BA = n-butylamine), which can achieve ideal optical and dielectric switching performance simultaneously. 44 Among these reports, the phase transition is mainly caused by the order−disorder arrangement of organic ammonium cations, which provide a potential strategy to find new multifunctional OIHMs by adjusting organic ammonium cations.…”

“…For example, Chen et al reported a new layered perovskite, (4-fluorophenethylaminium) 2 [CuCl 4 ], which shows above-room-temperature ferroelasticity, reversible thermochromism, semiconductivity, and low-temperature ferromagnetic ordering . Fu et al reported an organic–inorganic hybrid perovskite, [(BA) 2 –PbI 4 ] (compound 1, BA = n -butylamine), which can achieve ideal optical and dielectric switching performance simultaneously .…”

Structural Optimization and Property Tunability by Halogen Regulation in Zero-Dimensional Zinc Halide Organic–Inorganic Hybrid Materials

“…Organic–inorganic hybrid materials have many benefits: inexpensive raw materials, easy synthesis, and structural flexibility. − Due to their exceptional qualities, these materials have received a lot of attention, including band gap adjustability, phase transition characteristics, and nonlinear optical switching characteristics. − The inorganic and organic parts could compose ″host cages″, which could easily result in phase transition accompanied with abrupt changes in physical properties close to the phase transition point. − The low-dimensional compounds have unprecedented structural flexibility and adjustability in photoelectric properties compared with 3-D hybrid materials. − For instance, Zhang’s group reported a 0-D organic–inorganic hybrid material that underwent multistep reversible phase transition …”