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Dispositivos fotovoltaicos de todos los polímeros de poli- 3 - 4 - n-octilo - feniltiofeno) de la polimerización de

Thomas W Holcombe¹, Claire H Woo, David F J Kavulak

¹Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.

Journal of the American Chemical Society

|September 18, 2009

Resumen

El poli[3-(4-n-octilo) -feniltiofeno] (POPT) sintetizado a través de la Metátesis de Grignard (GRIM) muestra una promesa para los fotovoltaicos orgánicos (OPV). Los dispositivos basados en POPT logran altas eficiencias, superando el rendimiento de materiales similares en células solares de todos los polímeros.

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
Electrónica orgánica y electrónica orgánica.
La energía fotovoltaica es fotovoltaica.

Sus antecedentes:

Los fotovoltaicos orgánicos (OPV) ofrecen una alternativa prometedora a las células solares tradicionales basadas en silicio.
El desarrollo de materiales orgánicos semiconductores eficientes y estables es crucial para el avance de la tecnología OPV.
Los poli ((3-alquiltiofeno) son ampliamente estudiados por su potencial en los OPV, pero su rendimiento puede ser limitado.

Objetivo del estudio:

Para sintetizar y caracterizar el poli[3-(4-n-octilo) -feniltiofeno] (POPT) mediante la polimerización de la Metatesis de Grignard (GRIM).
Evaluar las propiedades electrónicas, ópticas y de procesamiento de GRIM POPT para aplicaciones fotovoltaicas orgánicas.
Para comparar el rendimiento de los OPV basados en POPT con dispositivos de última generación que utilizan otros semiconductores orgánicos.

Principales métodos:

Se empleó la polimerización de Grignard Metathesis (GRIM) para la síntesis de POPT.
Se utilizaron mediciones de corriente limitada de carga espacial y transistores de efecto de campo para determinar las movilidades de los agujeros.
Se fabricaron películas delgadas mediante spin-casting, y se analizaron sus propiedades ópticas (band gap).
Se fabricaron y probaron dispositivos fotovoltaicos orgánicos de heterojunción a granel (BHJ) y de doble capa.

Principales resultados:

GRIM POPT exhibe características electrónicas, ópticas y de procesamiento favorables para los OPV.
El POPT demostró movilidades de agujero de 1 x 10{-4} cm{-2}/{V} s (SCC) y 0.05 cm{-2}/{V} s (FET).
Las películas delgadas POPT mostraron una brecha de banda de 1,8 eV, y los dispositivos PC(61) BM: POPT BHJ lograron una eficiencia máxima del 3,1%.
Un OPV de doble capa de todo polímero que utiliza POPT y CNPPV alcanzó un 2,0% de eficiencia, superando el rendimiento de un dispositivo P3HT/CNPPV (0,93% de eficiencia).

Conclusiones:

GRIM POPT es un material viable para sistemas fotovoltaicos orgánicos de alto rendimiento.
Los dispositivos basados en POPT demuestran eficiencias competitivas, particularmente en configuraciones de todos los polímeros.
El estudio destaca el potencial de POPT como una alternativa a P3HT en aplicaciones OPV, desafiando las suposiciones anteriores sobre la selección de materiales basada en la alineación del nivel de energía.

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