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Alkaline Earth Metal-Based Hybrid Organic-Inorganic Perovskite-Like Ferroelectrics
Qi-Fang Zhou1, Lei Pan1, Hao-Fei Ni1
1Institute for Science and Applications of Molecular Ferroelectrics, Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, 321004, P.R. China.
Angewandte Chemie (International Ed. in English)
|August 1, 2025
Summary
Researchers developed new alkaline earth metal-based hybrid organic-inorganic perovskites (HOIPs) exhibiting ferroelectricity. Molecular fluorination enhanced properties, paving the way for novel flexible ferroelectric devices.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Hybrid organic-inorganic perovskites (HOIPs) are promising for photovoltaics, optoelectronics, and ferroelectrics due to their structural diversity and chemical tunability.
- Alkaline earth metals (Ca, Sr, Ba) have been underexplored in HOIPs, with ferroelectric applications yet to be realized.
- The historical significance of perovskites traces back to the CaTiO3 mineral.
Purpose of the Study:
- To report a new family of alkaline earth metal-based HOIP-like ferroelectrics.
- To investigate the ferroelectric properties of these novel materials.
- To explore the potential of molecular fluorination in optimizing ferroelectric performance.
Main Methods:
- Synthesis of alkaline earth metal-based HOIPs, including (pyrrolidinium)Ba(ClO4)3.
- Characterization of ferroelectric properties in bulk single crystals and polycrystalline powders.
- Application of molecular fluorination on the organic cation to tune material properties.
Main Results:
- A new family of HOIP-like ferroelectrics based on alkaline earth metals was discovered.
- (Pyrrolidinium)Ba(ClO4)3 exhibits significant ferroelectricity with robust polarization switching.
- Molecular fluorination of the pyrrolidinium cation in (R-3-fluoropyrrolidinium)Ba(ClO4)3 enhanced Curie temperature, polar axes, and polarization values.
Conclusions:
- This work introduces a novel structural paradigm for HOIP ferroelectrics utilizing alkaline earth metals.
- The developed materials demonstrate potential for emerging flexible ferroelectric applications due to their easy preparation and plasticity.
- Further optimization through molecular design opens new avenues for advanced ferroelectric materials.
Keywords:
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