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Un polímero conjugado de donante-aceptor con pulverización procesable, baja brecha de banda y ambipolar
Timothy T Steckler1, Xuan Zhang, Jungseek Hwang
1The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, Center for Macromolecular Science and Engineering, University of Florida, Box 117200, Gainesville, Florida 32611, USA.
Journal of the American Chemical Society
|February 10, 2009
Resumen
Los investigadores desarrollaron un nuevo polímero con la menor brecha de banda, lo que permite la solubilidad y el procesamiento de pulverización para la electrónica orgánica. Este material exhibe un comportamiento ambipolar y cuatro estados redox, allanando el camino para aplicaciones avanzadas.
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:
- El desarrollo de semiconductores orgánicos de alto rendimiento es crucial para el avance de los dispositivos electrónicos.
- Se buscan polímeros solubles y procesables para una fabricación rentable.
- Lograr energías de baja brecha de banda es clave para una eficiente absorción de luz y transporte de carga.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo polímero con una brecha de banda récord baja.
- Para investigar la solubilidad, procesable y propiedades electrónicas del polímero.
- Para correlacionar las mediciones de brecha de banda óptica experimental con cálculos teóricos.
Principales métodos:
- Síntesis de un polímero que combina un donante fuerte (tris(dodeciloxi) fenil) - ditíeno [3,2-b:2',3'-d] pirrol y un aceptor fuerte (4,8-ditíeno-2-il-2lambda(4) delta(2) - benzo [1,2-c;4,5-c'] bis [1,2,5] tiadiazol).
- Estimación de la brecha de banda óptica utilizando espectroscopia de transmisión / absorción en nanotubos de carbono de pared única (SWCNT) y espectroscopia de reflectancia en oro.
- Evaluación de los estados redox y el comportamiento ambipolar en los transistores orgánicos de efecto de campo (OFET).
Principales resultados:
- El polímero sintetizado exhibe la menor brecha de banda (0,5-0,6 eV) para un material soluble procesable por pulverización hasta la fecha.
- El polímero demuestra el acceso a cuatro estados redox distintos.
- El transporte de carga ambipolar se observó en los transistores orgánicos de efecto de campo (OFET).
- Los valores experimentales de brecha de banda óptica muestran una buena concordancia con los cálculos teóricos.
Conclusiones:
- El nuevo polímero representa un avance significativo en semiconductores orgánicos procesables en solución con baja brecha de banda.
- Sus propiedades electrónicas únicas y capacidad de procesamiento ofrecen potencial para la próxima generación de dispositivos electrónicos orgánicos.
- El estudio valida la efectividad de la combinación de unidades donantes y aceptadoras específicas para propiedades de materiales a medida.
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