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Published on: October 1, 2019
A Three-Dimensional Lead Halide Perovskite-Related Ferroelectric
Han-Yue Zhang1, Xian-Jiang Song1, Hao Cheng2
1Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, People's Republic of China.
Researchers discovered a new 3D lead halide ferroelectric material, [2-trimethylammonioethylammonium]Pb2Cl6 ([TMAEA]Pb2Cl6). This novel compound exhibits excellent ferroelectricity and semiconducting properties, expanding the possibilities for 3D hybrid lead halide applications.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Three-dimensional (3D) organic-inorganic lead halides, like [CH3NH3]PbI3 perovskite, are crucial for optoelectronics.
- The scarcity and debated ferroelectricity of 3D lead halides limit their applications.
- Developing new 3D lead halide materials with robust ferroelectric properties is essential.
Purpose of the Study:
- To report the discovery and characterization of a novel 3D lead halide ferroelectric material.
- To investigate the ferroelectric and semiconducting properties of the new compound.
- To expand the library of 3D hybrid lead halides for advanced applications.
Main Methods:
- Single-crystal X-ray diffraction to determine the crystal structure.
- Temperature-dependent powder X-ray diffraction to study phase transitions.
- Ferroelectric hysteresis loop measurements to confirm ferroelectricity.
- UV-Vis spectroscopy to determine the band gap.
Main Results:
- A new 3D lead halide perovskite-related ferroelectric, [2-trimethylammonioethylammonium]Pb2Cl6 ([TMAEA]Pb2Cl6), was synthesized.
- The material exhibits a ferroelectric-to-paraelectric phase transition at 412 K.
- A spontaneous polarization of 1 μC/cm² and clear domain switching were observed at 293 K.
- The compound shows semiconducting behavior with a direct band gap of 3.43 eV.
Conclusions:
- [TMAEA]Pb2Cl6 is the first reported 3D lead halide exhibiting excellent ferroelectricity.
- The discovery enriches the family of 3D hybrid lead halides.
- This finding encourages further exploration of 3D lead halide ferroelectrics for potential device applications.
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