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Se acerca el transporte libre de desorden en polímeros conjugados de alta movilidad
Deepak Venkateshvaran1, Mark Nikolka1, Aditya Sadhanala1
1Optoelectronics Group, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, UK.
Nature
|November 11, 2014
Resumen
Los investigadores desarrollaron nuevos polímeros conjugados para electrónica flexible. Estos materiales exhiben un transporte de carga casi libre de trastornos, superando una limitación clave en el rendimiento y el diseño del semiconductor de polímero.
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 polímeros conjugados son cruciales para los dispositivos de semiconductores flexibles y de bajo costo.
- A pesar de los avances, el transporte de carga está limitado por el desorden en las películas de polímero.
- Este trastorno dificulta el diseño de materiales y el estudio de la deslocalización de electrones.
Objetivo del estudio:
- Para investigar las propiedades de transporte de carga en polímeros conjugados de alta movilidad.
- Identificar diseños moleculares que minimicen el desorden y se acerquen a los límites intrínsecos del transporte.
- Para entender los orígenes estructurales de la mejora del transporte de carga.
Principales métodos:
- Estudios comparativos de transporte utilizando Seebeck modulado por el efecto de campo, transistores y mediciones de absorción óptica.
- Análisis de un copolímero donante-aceptor específico basado en indacenodiotiofeno.
- Simulaciones de dinámica molecular para sondear la conformación de la columna vertebral y la resiliencia del trastorno.
Principales resultados:
- Varios polímeros de alta movilidad demostraron que el transporte de carga se acercaba a los límites libres de desorden.
- Un copolímero donante-aceptante específico exhibió una microestructura casi amorfa con un excelente transporte.
- La dinámica molecular reveló una columna vertebral plana y libre de torsión como clave para superar el desorden.
Conclusiones:
- Es posible lograr un transporte libre de desorden en polímeros conjugados.
- Las conformaciones de la columna vertebral planas y libres de torsión son críticas para un alto rendimiento.
- Estos hallazgos ofrecen principios de diseño para semiconductores orgánicos de próxima generación.
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