Hybrid Perovskite Molecular Rotor Ferroelastic Semiconductor Constructed by Supramolecular Assembly

Organic–inorganic hybrid ferroelastic materials have emerged as promising candidates for various applications such as mechanical switches, signal conversions, and memory materials because of their convenient processing, structural flexibility, and environmental friendliness. Here, we reported a supramolecular assembly hybrid perovskite (15-crown-5·NH₄)₂TeCl₆ (1) semiconductor containing stator ammonium and rotor 15-crown-5 as cations and TeCl₆ as an anionic part. This hybrid perovskite shows a ferroelastic phase transition and dielectric switch induced by the motions of the crown rotor. In addition, it shows an X-ray detection response with a clear switching ratio of photocurrent 0.011 and dark current 0.001 nA cm^–2. This study reveals the advantages of a supramolecular rotor strategy in discovering novel molecular ferroelastic semiconductor materials and provides a new avenue to explore functional hybrid molecular materials.