Thermal-Induced Ferroelastics in Two Lead-Free Organic–Inorganic Hybrid Perovskites

Tin-based organic–inorganic metal halides with a reversible phase transition and thermochromic response

“…[24][25][26][27][28][29][30] Compared with high-dimensional hybrid phase transition materials with limited organic ammonium species, the structures of low-dimensional compounds are more flexible and diverse. [31][32][33][34] Meanwhile, low-dimensional materials can provide a large degree of freedom for organic ammonium, thereby triggering the order-disorder phase transition. [35][36][37][38] As an example, Zou et al…”

Three-Dimensional Perovskite Phase Transition Materials with Switchable Second Harmonic Generation Properties Introduced by Homochiral (1S,4S)-2,5-Diazabicyclo[2.2.1]-heptane

“…Among the organic–inorganic hybrid perovskite (OIHP) compounds, the three-dimensional (3D) OIHPs with the general formula ABX 3 , (where A is an organic cation, B is an inorganic cation, and X is a halogen anion) have been attracting the most interest due to their excellent chemical flexibility and outstanding potential in applications such as electronics and photovoltaics. ,− In the ABX 3 perovskite structure, the BX 6 octahedrons form a three-dimensional (3D) framework through sharing vertices, and the organic cations are located in the voids of the 3D framework with a large space for activity. When subjected to external stimuli (such as temperature, stress, etc.…”

High-Symmetry Structural Phase Transition Triggers a Triple Switch Based on Dielectric, Nonlinear Optics, and Photoluminescence

“…Simple physical response sometimes cannot express the characteristic requirements of a device. Therefore, multifunctional composites are one of the strategies of material design to meet the requirement. − Multifunctional responses, integrating multiple physical channels into a single device such as optical and electric properties, have gained widespread attention and have tremendous development potential to miniaturize and integrate electric devices. − In order to achieve multifunctional responsive materials with excellent performance, the relationship between the intrinsic structure and physical/chemical properties has been continuously explored. − Composites with ideal multifunctional responses, especially dielectric switchable materials with other physical properties such as photoluminescence, − nonlinear optical properties, − and semiconductor properties, − can have wide applications.…”