A multifunctional molecular ferroelectric with chiral features, a high Curie temperature, large spontaneous polarization and photoluminescence: (C₉H₁₄N)₂CdBr₄

Abstract

Low dimensional chiral organic-inorganic hybrid metal halide have attracted much attention in recent years due to their unique intrinsic properties, including potential applications in optoelectronic and spintronic devices. However, low...

Tunable hybrid perovskites with a narrow bandgap and multistage phase transition properties: 2,2-difluoroethylamine·antimony hexabromide

“…Assembled perovskites have garnered much attention due to their potential applications in solar cells, optoelectronics, energy storage, photoelectric detection, and semiconductors. 1 Multifunctional materials have become very popular recently because of their many special physical properties, 2–7 such as ferroelectricity, switchable dielectrics, photoelectric effect, nonlinear optics, etc. Metal halide perovskites can be assembled using various organic and inorganic components, and their general two-dimensional (2D) structural formulae are A 2 BM 4 (where A + is an organic cation, B 2+ is a bivalent p-block metal ion, and X − is a halide ion).…”

A new crown-ether clathrate [15-crown-5][Y(NO3)2(H2O)5][NO3] with switchable dielectric constant behaviour

“…Many materials featuring dielectric switching have been reported. 9–17 However, it remains challenging for researchers to achieve the occurrence of dielectric switching in molecule-based materials at the present stage. Fortunately, host–guest clathrates have been found to be a highly promising class of molecule-based switchable dielectrics.…”

Ferroelectricity in a hydrogen-bonded alternating donor–acceptor supramolecular copolymer

“…The observed P s value of this supramolecular copolymer is indeed very impressive compared to those reported for other D–A systems 5 or even some inorganic–organic hybrid perovskite materials. 12 Individually NDI or Py did not show any FE-hysteresis or switching current as measured from their thin film devices (Fig. S10, ESI†), indicating that the ferroelectricity stems from the CT-complex formation in the copolymer system.…”

“…P s increased at 313 K (∼5 μC cm −2 ) and above T c , hysteresis showed high leakage contribution and no ferroelectricity. 12,14 To determine the switched FE-polarization that is stable for the chosen delay time, the integral of switching current can be used to find the switched polarization. Through applying a series of voltage pulses by the square-wave method in PUND (positive up negative down), the current transients are measured, which allows for the separation of different components of the FE response.…”