Successive near-room-temperature dielectric phase transitions in a lead-free hybrid perovskite-like compound†,Inorganic Chemistry Frontiers

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Successive near-room-temperature dielectric phase transitions in a lead-free hybrid perovskite-like compound†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-11-19 00:00:00 , DOI: 10.1039/c8qi01097h
Jing Zhang _{1,

2,

3,

4,

5} , Shiguo Han _{1,

2,

3,

4,

5} , Xitao Liu _{1,

2,

3,

4,

5} , Chengmin Ji _{1,

2,

3,

4,

5} , Kewen Tao _{1,

2,

3,

4,

5} , Muhammad Adnan Asghar _{6,

7,

8,

9} , Junhua Luo _{1,

2,

3,

4,

5} , Zhihua Sun _{1,

2,

3,

4,

5}

Affiliation

Solid–solid phase transition materials have attracted increasing attention because of their variety of applications in optoelectronic devices, data storage, and ferroelectric field-effect transistors. Hybrid organic–inorganic perovskite materials combine the characteristics of organic and inorganic components and thus might be promising candidates to obtain phase-transition materials. Here, we report a lead-free organic–inorganic hybrid (hexamethyleneimine)₂BiBr₅ (1), which displays successive phase transitions at 268 K, 304 K and 311 K upon heating; these phase transitions are induced by the distorted configurational change in organic cations and slight reorientational displacement of [BiBr₅]_n²⁻ polyanionic zigzag chains. In addition, the UV/Vis optical spectrum indicates that 1 has an indirect bandgap of 2.70 eV. Furthermore, computational analyses disclose that the inorganic perovskite-like building blocks of 1 contribute significantly to its semiconducting properties. This study offers a pathway to explore new lead-free organic–inorganic hybrids with phase transition.

中文翻译：

无铅混合钙钛矿型化合物中的连续近室温介电相变†

固-固相变材料由于在光电器件，数据存储和铁电场效应晶体管中的各种应用而引起了越来越多的关注。有机-无机钙钛矿杂化材料结合了有机和无机成分的特性，因此有望成为获得相变材料的候选材料。在这里，我们报道了一种无铅的有机-无机杂化（六亚甲基亚胺）₂ BiBr ₅（1），它在加热时在268 K，304 K和311 K上显示出连续的相变。这些相变是由扭曲的有机阳离子构型变化和[BiBr ₅ ] _n^2−的轻微方向性位移引起的聚阴离子之字形链。此外，UV / Vis光谱表明1具有2.70 eV的间接带隙。此外，计算分析表明，无机钙钛矿状结构单元1对其半导体性能有显着贡献。这项研究提供了探索具有相变的新型无铅有机-无机杂化物的途径。

更新日期：2018-11-19

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