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Efecto de la isomerización en los receptores de electrones no fullerenos de alto rendimiento

Jiayu Wang¹, Junxiang Zhang², Yiqun Xiao³

¹Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education , Peking University , Beijing 100871 , China.

Journal of the American Chemical Society

|July 4, 2018

Resumen

Se sintetizaron dos aceptores de electrones de anillo fundido isoméricos, FNIC1 y FNIC2. Las células solares orgánicas basadas en FNIC2 lograron una mayor eficiencia de conversión de energía (PCE) del 13,0% en comparación con FNIC1, lo que demuestra un mejor rendimiento.

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 alto rendimiento.
El diseño molecular isomérico ofrece una estrategia para ajustar las propiedades electrónicas y ópticas.
Los sistemas de anillos fundidos son cruciales para el desarrollo de materiales de aceptación de electrones avanzados.

Objetivo del estudio:

Diseñar y sintetizar nuevos aceptores de electrones isoméricos de anillo fundido, FNIC1 y FNIC2.
Investigar las relaciones estructura-propiedad entre los isómeros.
Evaluar su rendimiento en aplicaciones de células solares orgánicas.

Principales métodos:

Síntesis de dos aceptores de electrones isoméricos de nueve anillos fusionados (FNIC1 y FNIC2).
Caracterización de las propiedades electrónicas, ópticas, de transporte de carga y morfológicas.
Fabricación y ensayo de células solares orgánicas utilizando mezclas PTB7-Th:FNIC1 y PTB7-Th:FNIC2.

Principales resultados:

FNIC2 exhibió absorción desplazada al rojo, mayor afinidad de electrones, menor energía de ionización y mayor movilidad de electrones en comparación con FNIC1.
Las células solares orgánicas basadas en PTB7-Th:FNIC2 lograron una eficiencia de conversión de energía (PCE) del 13,0%, superando a los dispositivos basados en FNIC1 (10,3%).
Los dispositivos semitransparentes con FNIC2 mostraron PCEs más altos en varias transmisiones visibles promedio (AVT) que los con FNIC1.

Conclusiones:

Las modificaciones isoméricas en los aceptores de electrones de anillo fundido afectan significativamente sus propiedades y el rendimiento del dispositivo.
FNIC2 representa un material aceptor de electrones prometedor para las células solares orgánicas de alta eficiencia.
El estudio pone de relieve el potencial de la ingeniería isomérica para el avance de la tecnología fotovoltaica orgánica.

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