在二维混合化矿中使用封闭驱动铁电
Xiao-Gang Chen1, Xian-Jiang Song1, Zhi-Xu Zhang1
1Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, People's Republic of China.
Journal of the American Chemical Society
|May 12, 2020
概括
我们开发了一种新的2D层化铁电, (4,4-DFHHA) 2PbI4,表现出显著的自发偏振和高基里温度. 这一发现为未来的应用提供了铁电材料.
科学领域:
- 材料科学
- 固态物理
- 晶体学
背景情况:
- 有机-无机混合矿 (OIHPs) 由于其调节性特性和易于制造,对铁电,太阳能电池和电光应用具有前景.
- 带有狭窄带间隙的酸铁电材料很少见,这限制了它们的潜在应用.
- 之前对 (HHA) PbI3和 (4-FHHA) PbI3等1D OIHP的研究表明,它们在室温下是非铁电的,因为它们的离子是无序的.
研究的目的:
- 合成和描述一个新的2D层酸铁电.
- 调查化中阴离子排序,封闭效应和铁电之间的关系.
- 探索开发具有增强性能的酸铁电材料的新策略.
主要方法:
- 通过与PbI2组装有机成分 (HHA,4-FHHA,4,4-DFHHA) 来合成酸.
- 合成材料的结构和铁电特性.
- 分析2D PbI4框架和电离子封闭对铁电行为的作用.
主要成果:
- 一种新的2D层化, (4,4-DFHHA) 2PbI4,已成功合成.
- (4,4-DFHHA) 2PbI4具有1.1μC/cm2的自发偏振,2.32 eV的直接带隙,以及454K的高基里温度.
- 在 (4,4-DFHHA) 2PbI4 的有限的2D PbI4 框架内排列的电离体导致自发的极化,与非铁电1D对应物不同.
结论:
- 在二维层结构中,封闭效应对于在化中实现铁电是至关重要的.
- 这项工作提供了一个有效的策略来扩大酸铁电库.
- 这些发现鼓励进一步研究这些材料的铁电和光伏特性之间的相互作用.
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