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Copolímeros de donante-aceptor basados en benzotriofeno con distintas organizaciones supramoleculares
Xin Guo1, Sreenivasa Reddy Puniredd, Martin Baumgarten
1Max Planck Institute for Polymer Research, Mainz, Germany.
Journal of the American Chemical Society
|May 12, 2012
Resumen
Los investigadores sintetizaron dos nuevos copolímeros donante-aceptor, P1 y P2, para la electrónica orgánica. A pesar de estructuras similares, P1 no mostró transporte de carga, mientras que P2 logró una alta movilidad del agujero, destacando el impacto de la curvatura de la columna vertebral en el rendimiento.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Electrónica orgánica y electrónica orgánica.
- Química de Polímeros La Química de Polímeros es la química de los polímeros.
Sus antecedentes:
- Los copolímeros donante-aceptante son cruciales para los dispositivos electrónicos orgánicos.
- El benzo[2,1-b:3,4-b':5,6-c′′]tritiofeno es una nueva unidad donante con potencial para afinar las propiedades del polímero.
- Comprender las relaciones estructura-propiedad es clave para optimizar el rendimiento de los semiconductores.
Objetivo del estudio:
- Para sintetizar y caracterizar dos nuevos copolímeros donante-aceptor (P1 y P2) que incorporan una unidad donante única.
- Investigar el impacto de las modificaciones estructurales en la organización supramolecular, la microestructura de la película y las propiedades de transporte de carga.
- Para correlacionar la curvatura de la columna vertebral del polímero con el rendimiento del transistor en los transistores orgánicos de efecto de campo (OFET).
Principales métodos:
- Síntesis de los copolímeros P1 y P2 de donante y receptor.
- Caracterización de las distancias de apilamiento π y la organización supramolecular.
- Fabricación y prueba de P1 y P2 en transistores de efecto de campo.
- Análisis de la curvatura de la columna vertebral del polímero utilizando métodos computacionales o espectroscópicos.
Principales resultados:
- Ambos polímeros exhibieron pequeñas distancias de apilamiento π (0,35 nm para P1, 0,37 nm para P2) debido a la unidad donante en forma de disco.
- P1 mostró una organización supramolecular distinta en comparación con los polímeros convencionales y P2.
- No se observó transporte de la compañía de carga para P1 en OFETs.
- P2 demostró una movilidad de agujero significativa de hasta 0,04 cm.
Conclusiones:
- El grado de curvatura en la columna vertebral del polímero influye significativamente en la organización supramolecular y el transporte de carga.
- La introducción de unidades adicionales de tiofeno en P2 indujo una curvatura que mejoró la movilidad del agujero.
- Estos hallazgos proporcionan información crítica para el diseño de semiconductores orgánicos de alto rendimiento mediante el control de la arquitectura del polímero.
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