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La estructura molecular y la dinámica en las interfaces dentro de los materiales de heterounión a granel para las
Cuiying Yang1, Jerry G Hu, Alan J Heeger
1Center of Polymers and Organic Solids, University of California, Santa Barbara, California 93106-5090, USA.
Journal of the American Chemical Society
|September 7, 2006
Resumen
La resonancia magnética nuclear (RMN) reveló distintos arreglos moleculares en las heterojunciones a granel de regioregular-poly ((3-hexylthiophene-2,5-diyl) (rrP3HT) y C ((60) derivados. El recocido indujo el autoensamblaje, separando rrP3HT y PCBM, y causando C(60) distorsión.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Electrónica orgánica y electrónica orgánica.
- Química Física es la química física.
Sus antecedentes:
- Las heterojunciones masivas son clave para las células solares orgánicas.
- Comprender la estructura molecular interfacial es crucial para el rendimiento del dispositivo.
- Regioregular-poli 3-hexiltiofeno-2,5-diilo) (rrP3HT) y los derivados del fullereno (PCBM) son materiales comunes.
Objetivo del estudio:
- Para investigar las estructuras moleculares en la interfaz rrP3HT/fullereno.
- Para determinar cómo el recocido afecta la morfología de la interfaz.
- Para correlacionar los cambios estructurales con las propiedades del fullereno.
Principales métodos:
- Espectroscopia de resonancia magnética nuclear (RMN) unidimensional y bidimensional. espectroscopia de resonancia magnética nuclear (RMN) en una y dos dimensiones.
- Análisis de los datos de desplazamiento químico (CS) y velocidad de relajación de la red de espín (1/T1).
- Fabricación y recocido de películas compuestas (CF).
Principales resultados:
- A temperatura ambiente, las cadenas laterales de alquilo rrP3HT "envuelven" C(60) (PCBM).
- El recocido a 150°C conduce al autoensamblaje y la separación de rrP3HT y PCBM.
- El recocido induce distorsiones en la simetría de C60, evidenciadas por las divisiones de RMN y la dinámica de C60.
Conclusiones:
- La RMN proporciona información detallada sobre la estructura a nanoescala de las heterojunciones masivas.
- El recocido altera significativamente el empaque molecular interfacial.
- La distorsión y la dinámica observadas en C60) están vinculadas a las interacciones interfaciales y al recocido.
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