Light‐Induced Dielectric Enhancement in a 2D Dion–Jacobson Type Perovskite Phase Transition Material

Abstract

Stimuli‐responsive materials, showing bistable behaviors between two distinct states under external stimuli, can be potentially applied as basic components of modern electrical and electronic devices. 2D hybrid perovskites hold a promise to switch and tune dielectric bistability based on their solid‐state phase transitions. Here, strong dielectric enhancements are successfully actualized by virtue of light illumination in a Dion–Jacobson (DJ) type 2D hybrid perovskite, (HDA)(MA)2Pb3Br10 (1, where HDA is 1,6‐hexanediammonium and MA is methylammonium). Upon heating, 1 exhibits an ordered–disordered phase transition ≈ 324 K (Tc), accompanying a transition from its low to high dielectric state. Strikingly, its light‐induced dielectric constant changes are greatly enhanced with a magnitude up to 250% near the Tc, superior to most traditional inorganic phase transition materials. This process closely relates to the photoexcited dielectric effect that is caused by the interband photo‐excitation. Benefitting from the stability of DJ‐type perovskite structure, the switching cycles of dielectric enhancement display operational stability with superior anti‐fatigue characteristics. As per the knowledge, the findings of this strong dielectric enhancement are unprecedented in the family of 2D DJ‐type hybrid perovskites, which will facilitate broad interest in exploiting new stimuli‐responsive materials to assemble high‐performance smart electronic devices.

Durable dielectric switching and photo-responsivity in a Dion–Jacobson hybrid perovskite semiconductor

“…[1][2][3][4] In particular, in the region of phase transition materials, the dynamic synergistic effect between organic and inorganic components in 2DHPs significantly facilitates the introduction of thermal-triggered ordered-disordered transitions. [5][6][7][8] This characteristic results in notable dielectric anomalies, making 2DHPs suitable for applications as thermal stimuli dielectric switching materials, offering novel capabilities such as temperature sensing, smart switching, and information processing. [9][10][11][12] Moreover, benefiting from the excellent semiconductor properties brought by the inorganic framework, including high optical absorption, defect tolerance, and long carrier lifetime, 2DHPs have also sparked great research enthusiasm in the field of photoelectric detection.…”