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Desentrañar el impacto de la mezcla de haluros en la estabilidad de la perovskita

Jeremy Hieulle¹, Xiaoming Wang², Collin Stecker¹

¹Energy Materials and Surface Sciences Unit (EMSSU) , Okinawa Institute of Science and Technology Graduate University (OIST) , 1919-1 Tancha , Onna-son , Okinawa 904-0495 , Japan.

Journal of the American Chemical Society

|January 17, 2019

Resumen

La mezcla de haluros mejora la estabilidad de la perovskita para las células solares. La incorporación de cloro, específicamente, ofrece una estabilidad superior al influir en la distribución de aniones, crucial para las aplicaciones fotovoltaicas comerciales.

Área de la Ciencia:

Ciencias de los materiales
Química del estado sólido
Las instalaciones fotovoltaicas

Sus antecedentes:

Las células solares de perovskita requieren una mayor estabilidad para su viabilidad comercial.
La mezcla de haluros es una estrategia clave para mejorar la estabilidad del material de perovskita.
La distribución precisa de los iones haluro en las perovskitas mixtas es objeto de debate, pero es fundamental para el rendimiento.

Objetivo del estudio:

Para determinar la ubicación exacta de los aniones (yodo y cloro) en las redes mixtas de perovskita halogenada.
Para correlacionar la distribución de halogenuros con una mayor estabilidad del material.
Identificar la incorporación óptima de cloro para la estabilidad sin comprometer el espacio entre bandas.

Principales métodos:

Microscopía de túnel de barrido combinada (STM) y teoría funcional de densidad (DFT) para la localización de aniones.
Análisis de las propiedades electrónicas y la estabilidad de las perovskitas mixtas de halogenuros.
Espectroscopia de fotoelectrones en una arquitectura de dispositivo de media célula para verificar la estabilidad.

Principales resultados:

Determinación precisa de la ubicación de los aniones de yodo y cloro en las perovskitas CH3NH3PbBr3-yIy y CH3NH3PbBr3-zClz.
Se ha demostrado que la incorporación de cloro mejora significativamente la estabilidad de la perovskita en comparación con el yodo.
Se identificó una proporción óptima de cloro para mejorar la estabilidad sin cambios adversos en el intervalo de banda.

Conclusiones:

Resolvió el debate sobre la distribución de aniones halogenados y su impacto en la estabilidad de la perovskita.
La incorporación de cloro es una estrategia prometedora para la fabricación de dispositivos fotovoltaicos de perovskita estable.
Los hallazgos proporcionan información crítica para el diseño de celdas solares de perovskita duraderas de próxima generación.

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