Novel One-Dimensional Organic–Inorganic Hybrid Halide Perovskite Material with Coexistence of High Phase Transition Temperature and Corresponding Dielectric Response

Organic–inorganic
hybrid perovskite materials have attracted
much attention because they combine the advantages of the organic
and inorganic components at the molecular level. Organic–inorganic
hybrid materials have both the structural variability and the flexibility
of organic components, as well as magnetic, electrical, and thermal
properties of inorganic components. A novel one-dimensional organic–inorganic
hybrid halide perovskite material [Et3NCH2Br][PbBr3] (compound 1) undergoes a high-temperature phase
transition at around 429.3 K, which is triggered by the order–disorder
change of cations. Differential scanning calorimetry, a dielectric
test, and single-crystal X-ray diffraction indicate that compound 1 exhibits structural phase transition from the P21/c to P63/m space group and a prominent dielectric anomaly.
Strikingly, the bandgap of compound 1 is 3.12 eV. It
is believed that our findings will contribute to an alternative pathway
for the design of multifunctional materials.

有机-无机杂化钙钛矿材料因其能在分子层面结合有机与无机成分的优点而备受瞩目。此类有机-无机杂化材料兼具有机成分的结构可变性和灵活性，以及无机成分的磁性、电学和热学性质。一种新型的一维有机-无机杂化卤化钙钛矿材料[Et3NCH2Br][PbBr3]（化合物1）在大约429.3 K的温度下发生高温相变，该相变由阳离子的有序-无序转变触发。差示扫描量热法、介电测试和单晶X射线衍射表明，化合物1表现出从P21/c到P63/m空间群的晶体结构相变，并呈现出显著的介电异常。引人注目的是，化合物1的带隙为3.12 eV。有理由相信，我们的发现将为多功能材料设计的替代路径做出贡献。