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El ordenamiento supramolecular en monocapas de oligotiofeno y fullereno
Jennifer M MacLeod1, Oleksandr Ivasenko, Chaoying Fu
1INRS-EMT, Université du Québec, 1650 Boulevard Lionel-Boulet, Varennes, Quebec, Canada J3X 1S2.
Journal of the American Chemical Society
|November 19, 2009
Resumen
La microscopía de túnel de barrido reveló un ordenamiento molecular en semiconductores orgánicos. Este hallazgo tiene implicaciones para el diseño de células solares avanzadas de heterounión a granel.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
- Electrónica orgánica y electrónica orgánica.
Sus antecedentes:
- Los semiconductores orgánicos son cruciales para la próxima generación de dispositivos electrónicos.
- Comprender el autoensamblaje molecular es clave para controlar las propiedades de los materiales.
Objetivo del estudio:
- Investigar la separación de fases a escala molecular y el ordenamiento de las monocapas de oligotiofeno y fullereno.
- Para explorar las implicaciones potenciales para las células solares de heterojunción a granel.
Principales métodos:
- Se utilizó la microscopía de túnel de barrido (STM) de alta resolución para analizar monocapas moleculares en una superficie de grafito.
- El análisis se centró en las estructuras autoensambladas del ácido terthionobenzenetricarboxílico (TTBTA) y el fullereno C60.
Principales resultados:
- TTBTA se autoensambló en dos redes distintas: un alambre de pollo poroso y un motivo hexamericano compacto.
- La fase de alambre de pollo fue mezclada racemicamente, mientras que la fase de empaque cerrado fue enantioméricamente pura.
- Las moléculas C60 fueron alojadas dentro de las cavidades del alambre de pollo, formando dominios ordenados con carga controlada de fullereno.
Conclusiones:
- El estudio aclara las relaciones estructura-propiedad en monocapas de semiconductores orgánicos.
- El alojamiento completo ordenado dentro de las redes TTBTA sugiere caminos para diseñar dispositivos electrónicos orgánicos eficientes.
- La comensurabilidad y los efectos electrostáticos rigen la adsorción y el ordenamiento del fullereno.
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