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Hacia la estabilidad a largo plazo: aleaciones monocristalinas de catión y perovskita mixta que contienen cesio
Liang Chen1, Yan-Yan Tan1, Zhi-Xin Chen1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, and Collaborative Innovation Center of Chemistry for Energy Materials , Xiamen University , Xiamen 361005 , China.
Journal of the American Chemical Society
|January 5, 2019
Resumen
Los investigadores desarrollaron células solares estables de perovskita mediante la creación de nuevas aleaciones que contienen cesio. Estos materiales muestran una excelente durabilidad frente a los factores estresantes ambientales, allanando el camino para dispositivos de energía solar eficientes y duraderos.
Área de la Ciencia:
- Ciencias de los materiales
- Energía renovable
- Química del estado sólido
Sus antecedentes:
- Las células solares de perovskita ofrecen una alternativa prometedora a las tecnologías basadas en silicio.
- La escasa estabilidad a largo plazo sigue siendo un desafío crítico para la comercialización de células solares de perovskita.
- La estabilidad intrínseca del material es primordial para abordar los problemas de degradación.
Objetivo del estudio:
- Investigar sistemáticamente la estabilidad estructural de las aleaciones monocristalinas de cationes y perovskitas halogenadas mixtas que contienen cesio.
- Identificar nuevas composiciones de perovskita con mayor estabilidad a largo plazo para aplicaciones de celdas solares.
- Para aclarar los mecanismos subyacentes a la estabilidad del material de perovskita mejorada.
Principales métodos:
- Preparación de aleaciones monocristalinas de perovskita bien definidas con contenido variable de cesio y bromuro.
- Evaluación sistemática de la estabilidad estructural bajo exposición a la luz, el calor, el agua y el oxígeno.
- Análisis detallado de la estructura monocristalina para comprender los mecanismos de mejora de la estabilidad.
Principales resultados:
- Procesos de separación de fases identificados en aleaciones de perovskita con mayor contenido de cesio y/o bromuro.
- Se descubrió una composición de perovskita muy estable: (FAPbI3) 0.9 ((MAPbBr3) 0.05 ((CsPbBr3) 0.05.
- Logró una vida útil de 16 μs y demostró estabilidad durante 10.000 horas (agua-oxígeno) y 1000 horas (luz).
Conclusiones:
- Las aleaciones monocristalinas de perovskita desarrolladas ofrecen una plataforma robusta para las investigaciones de estabilidad.
- La nueva composición presenta una estabilidad excepcional, crucial para el desarrollo de células solares de perovskita eficientes y duraderas.
- Este trabajo establece un enfoque basado en un solo cristal para descubrir materiales estables de perovskita.
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