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Geometría y acoplamiento electrónico en pilas de perielenediimida: mapeo de las relaciones de transporte
Josh Vura-Weis1, Mark A Ratner, Michael R Wasielewski
1Department of Chemistry and Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, Illinois 60208-3113, USA.
Journal of the American Chemical Society
|January 26, 2010
Resumen
Los investigadores calcularon el acoplamiento electrónico en dímeros de perielenediimida (PDI), encontrando que varía significativamente con la geometría de apilamiento. Este estudio identifica prometedores derivados de PDI para los transistores orgánicos de película delgada (OTFT).
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química computacional es la química computacional.
- Electrónica orgánica y electrónica orgánica.
Sus antecedentes:
- Los derivados de perilenodiimida (PDI) son semiconductores orgánicos cruciales.
- Comprender el acoplamiento electrónico de dímeros pi-empillados es clave para optimizar el transporte de carga en los transistores orgánicos de película delgada (OTFT).
Objetivo del estudio:
- Para investigar la relación entre la geometría de apilamiento y el acoplamiento electrónico en PDI dimensional.
- Para identificar prometedores derivados de PDI para aplicaciones OTFT de alto rendimiento.
Principales métodos:
- Se emplearon cálculos químicos cuánticos utilizando M06-2X/6-31++G**.
- La energía de unión y el acoplamiento electrónico se analizaron sistemáticamente en función de la geometría de apilamiento de dímeros.
- El acoplamiento electrónico se calculó para 20 derivados de PDI con variadas sustituciones de imida.
Principales resultados:
- El acoplamiento electrónico en dímeros PDI exhibe una variación significativa (más de un orden de magnitud) debido a los mínimos superficiales de energía potencial poco profundos.
- Varios derivados de PDI con sustituciones específicas de imida demostraron valores de acoplamiento electrónico muy favorables.
- El análisis de la energía vinculante y el acoplamiento electrónico reveló candidatos prometedores para las OTFT.
Conclusiones:
- La geometría de apilamiento influye críticamente en el acoplamiento electrónico en dímeros PDI, impactando las propiedades de transporte de carga.
- La estrategia computacional de comparar la energía de unión y el acoplamiento electrónico es efectiva para diseñar nuevos materiales OTFT.
- Este enfoque puede extenderse a otros semiconductores orgánicos apilados en pi como el pentaceno y los derivados del poli (tiofeno).
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