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Agregación en un copolímero de baja brecha de banda tipo n de alta movilidad con implicaciones en la morfología

Robert Steyrleuthner¹, Marcel Schubert, Ian Howard

¹Institute of Physics and Astronomy, University of Potsdam, D-14476 Potsdam, Germany.

Journal of the American Chemical Society

|September 11, 2012

Resumen

La agregación en películas de polímero P ((NDI2OD-T2) es un proceso de dos pasos, impulsado por el enrollamiento de la cadena de polímero. Esta agregación tiene un impacto significativo en las propiedades de la película, lo que lleva a un alto contenido de agregados e inhibe las estructuras amorfas.

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
Química de Polímeros La Química de Polímeros es la química de los polímeros.
La fotofísica es la fotofísica.

Sus antecedentes:

P ((NDI2OD-T2) es un polímero donante / receptor de tipo n de alta movilidad y estabilidad al aire.
Comprender su comportamiento de agregación es crucial para optimizar los dispositivos electrónicos orgánicos.

Objetivo del estudio:

Investigar las propiedades fotofísicas y los mecanismos de agregación de P(NDI2OD-T2) en solución y películas delgadas.
Para correlacionar la agregación con la conformación de la cadena de polímero y la morfología de la película.

Principales métodos:

Espectroscopia UV-vis y fotoluminiscencia (PL) en estado estacionario.
Cálculos químicos cuánticos. cálculos químicos cuánticos. cálculos químicos cuánticos. cálculos químicos cuánticos. cálculos químicos cuánticos. cálculos químicos cuánticos.
Espectroscopía de Resonancia Magnética Nuclear (RMN) Espectroscopía de Resonancia Magnética Nuclear (RMN) Espectroscopía de Resonancia Magnética Nuclear (RMN) Espectroscopía de Resonancia Magnética Nuclear (RMN) Espectroscopía de Resonancia Magnética Nuclear (RMN) Espectroscopía de Resonancia Magnética Nuclear (RMN) Espectroscopía de Resonancia Magnética Nuclear (RMN) Espectroscopía de Resonancia Magnética Nuclear (RMN).
Mediciones PL dependientes del tiempo.
Ultrasentrifugado analítico.

Principales resultados:

Las distintas firmas espectrales indican la agregación en soluciones P{\displaystyle P{\mathrm {N} }2OD-T2} .
La agregación es un proceso de dos pasos que involucra diferentes tipos de agregados.
La RMN y la ultracentrifugación confirman la agregación a través del enrollamiento de la cadena de polímero.
La formación de película delgada está dominada por el colapso de la cadena, lo que resulta en un contenido de agregado de ~45%.
Se inhibe la formación de películas amorfas y desordenadas.

Conclusiones:

La agregación en P ((NDI2OD-T2) es una propiedad intrínseca influenciada por la conformación de la cadena polimérica.
El proceso de agregación en dos pasos y el enrollamiento en cadena son factores clave en la morfología de la película delgada.
El alto contenido de agregados en las películas afecta a sus propiedades electrónicas y al desorden.

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