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A Ferroeléctrico de perovskita molecular tridimensional: (3-Ammoniopirrolidinio) RbBr3
Qiang Pan1, Zhi-Bo Liu1, Yuan-Yuan Tang1
1Ordered Matter Science Research Center and ‡Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University , Nanjing 211189, P. R. China.
Journal of the American Chemical Society
|March 2, 2017
Resumen
Los investigadores desarrollaron un nuevo perovskita molecular 3D ferroeléctrico, (3-amoniopirrolidinio) RbBr3 [(AP) RbBr3]. Este material exhibe una ferroelectricidad sin precedentes a temperatura ambiente, abriendo nuevas vías para aplicaciones electrónicas avanzadas.
Área de la Ciencia:
- Ciencias de los materiales
- Física del estado sólido
- La cristalografía
Sus antecedentes:
- Las estructuras moleculares de perovskita, como CH3NH3PbI3, son prometedoras para los dispositivos solares, pero las versiones en 3D son raras.
- Los ferroeléctricos moleculares existentes suelen ser 1D o 2D, lo que limita sus aplicaciones prácticas.
- La mejora de las propiedades ferroeléctricas en perovskitas moleculares en 3D es crucial para el avance tecnológico.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo perovskita molecular 3D ferroeléctrico.
- Para investigar las propiedades ferroeléctricas, incluyendo la temperatura de Curie y la inversión de polarización.
- Explorar las aplicaciones potenciales de este nuevo material.
Principales métodos:
- En el caso de los compuestos químicos, se recomienda que se utilicen las siguientes combinaciones de compuestos:
- Caracterización mediante técnicas como la difracción de rayos X y las mediciones dieléctricas.
- Evaluación de la estabilidad térmica y la dinámica de conmutación de la polarización.
Principales resultados:
- Descubrimiento de un ferroeléctrico de perovskita molecular en 3D, (AP) RbBr3, con una alta temperatura de Curie (Tc = 440 K).
- Demostración de una ferroelectricidad sin precedentes a temperatura ambiente en una perovskita molecular en 3D.
- Observación de la alta estabilidad térmica, la inversión de polarización ultrarrápida (>20 kHz) y las características multiaxiales.
Conclusiones:
- El (AP) RbBr3 sintetizado representa el primer ferroeléctrico de perovskita molecular 3D reportado con un potencial significativo.
- Este descubrimiento ofrece una nueva vía para diseñar y sintetizar perovskitas moleculares ferroeléctricas.
- La naturaleza ajustable de los componentes (iones metálicos, iones halógenos, cationes orgánicos) permite el diseño de materiales controlados.
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