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Un receptor no fullereno con interacción intermolecular mejorada para células solares orgánicas de alto rendimiento

Francis Lin^1,2, Kui Jiang³, Werner Kaminsky²

¹Department of Chemistry, City University of Hong Kong, Kowloon 999077, Hong Kong.

Journal of the American Chemical Society

|August 25, 2020

Resumen

Los investigadores estudiaron los receptores no fullerenos (ANF) derivados del tiadiazol, como Y6 y CH1007, revelando cómo su estructura molecular e interacciones cara a cara mejoran el transporte de carga para las células solares eficientes. La sustitución de selenio en el CH1007 aumenta el rendimiento.

Área de la Ciencia:

Ciencias de los materiales
Productos electrónicos orgánicos
La cristalografía

Sus antecedentes:

Los aceptores no fullerenos (ANF) derivados del tiadiazol son cruciales para las células solares orgánicas de alta eficiencia.
Comprender su estructura molecular y autoensamblaje es clave para optimizar la generación de carga y las propiedades de transporte.

Objetivo del estudio:

Investigar la estructura cristalográfica y el autoensamblaje del NFA Y6 y su análogo de selenio, el CH1007.
Aclarar el papel de las interacciones moleculares en la determinación de las propiedades de estos AGN.
Para evaluar el rendimiento de los dispositivos fotovoltaicos que incorporan CH1007.

Principales métodos:

Estudios cristalográficos exhaustivos sobre el Y6 y el CH1007.
Análisis de la geometría molecular y las disposiciones de embalaje.
Fabricación y caracterización de dispositivos fotovoltaicos orgánicos utilizando una mezcla ternaria de PM6:CH1007:PC71BM.

Principales resultados:

Las interacciones del núcleo π cara a cara, impulsadas por fracciones de benzo[2,1,3]tiadiazol, influyen significativamente en la geometría molecular y el empaque en Y6 y CH1007.
La sustitución de selenio en CH1007 conduce a una absorción óptica desplazada hacia el rojo.
La mezcla ternaria PM6:CH1007:PC71BM logró una alta corriente de cortocircuito de 27,48 mA/cm2 y una eficiencia de conversión de potencia del 17,08%.

Conclusiones:

Las interacciones específicas de empaque molecular y núcleo π en Y6 y CH1007 son críticas para el transporte de carga superior.
La sustitución de selenio ofrece una estrategia viable para mejorar la absorción óptica y el rendimiento del dispositivo en los NFA.
Estos hallazgos proporcionan información valiosa para el diseño de celdas solares orgánicas de alto rendimiento de próxima generación.

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