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Agrupaciones de receptores de electrones rivales PDI sustituidos por alfa para células solares orgánicas

Qinghe Wu¹, Donglin Zhao¹, Alexander M Schneider¹

¹Department of Chemistry and The James Franck Institute, The University of Chicago , 929 E 57th Street, Chicago, Illinois 60637, United States.

Journal of the American Chemical Society

|May 25, 2016

Resumen

Se sintetizó un nuevo aceptador de electrones, TPB, con cuatro perielenediimidas (PDIs), para las células solares orgánicas. Los dispositivos que utilizan TPB lograron una alta eficiencia de conversión de energía (PCE) del 8,47%, lo que demuestra su potencial en aplicaciones fotovoltaicas.

Área de la Ciencia:

Ciencias de los materiales
Productos electrónicos orgánicos
Las instalaciones fotovoltaicas

Sus antecedentes:

Las células solares orgánicas (OSC) requieren aceptores de electrones eficientes para un rendimiento óptimo.
El ajuste de la estructura molecular de los aceptores es crucial para la morfología y el transporte de carga.

Objetivo del estudio:

Desarrollar un nuevo receptor de electrones tipo clúster, TPB, con un diseño molecular único.
Investigar el rendimiento de TPB como aceptor de electrones en células solares orgánicas.

Principales métodos:

Síntesis de TPB, una molécula con cuatro α-perilendiimidas (PDIs) en una conformación parecida a una cruz.
Fabricación y caracterización de las células solares invertidas utilizando películas de mezcla TPB:PTB7-Th.
Evaluación del rendimiento, incluida la eficiencia de conversión de potencia (PCE) y la densidad de corriente en cortocircuito (Jsc).

Principales resultados:

TPB exhibió una conformación molecular de tipo cruzado con conjugación parcial al núcleo BDT-Th.
Las películas de mezcla TPB:PTB7-Th mostraron una morfología favorable y una disociación de carga eficiente.
Las células solares invertidas alcanzaron un PCE más alto del 8,47% con un Jsc alto (> 18 mA/cm2).

Conclusiones:

TPB es un aceptor de electrones prometedor para las células solares orgánicas.
El diseño molecular de TPB contribuye a la generación y el transporte eficientes de carga.
Las células solares basadas en TPB muestran un rendimiento competitivo en comparación con las que utilizan aceptores convencionales como PC71BM.

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