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Efectos marcados de los sustitutos de alquilo vs alqueno en la estructura de estado sólido del tinte cuadrado, la
Diego Bagnis1, Luca Beverina, Hui Huang
1Department of Chemistry and the Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, Illinois 60208, USA.
Journal of the American Chemical Society
|March 9, 2010
Resumen
Introducción de dos nuevos tintes cuadráneos para las células solares orgánicas. El tinte sustituido por hexenilo mejora significativamente el transporte de carga y la eficiencia de conversión de potencia (PCE), logrando más del 2% de PCE en dispositivos procesados en solución.
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 tintes Squaraine son semiconductores orgánicos prometedores para aplicaciones de celdas solares.
- La optimización de la estructura molecular es clave para mejorar el transporte de carga y el rendimiento del dispositivo.
Objetivo del estudio:
- Para sintetizar y caracterizar dos nuevos tintes de cuadrado con cadenas laterales variables (n-hexilo frente a n-hexeno).
- Investigar el impacto de las modificaciones de la cadena lateral en el embalaje en estado sólido, el transporte de carga y el rendimiento de la energía fotovoltaica orgánica (OPV).
Principales métodos:
- Síntesis de tintes de esquaraína con sustituyentes de n-hexilo y n-hexeno.
- Fabricación de células solares orgánicas de heterojunción a granel (BHJ) utilizando los tintes sintetizados.
- Caracterización de la morfología de la película delgada, las propiedades de transporte de carga (movilidad del agujero) y el rendimiento del dispositivo (eficiencia de conversión de potencia - PCE).
Principales resultados:
- El tinte squaraine sustituido por n-hexenilo (squaraine 2) exhibió una estructura de estado sólido más compacta en comparación con el derivado n-hexilo (squaraine 1).
- La movilidad del agujero en las películas delgadas de squaraine 2 fue aproximadamente cinco veces mayor que en squaraine 1.
- Los dispositivos BHJ OPV basados en squaraine 2 lograron aproximadamente el doble de la eficiencia de conversión de potencia (PCE) de los que usan squaraine 1.
- Se lograron PCEs superiores al 2% para dispositivos procesados con soluciones ambientales, lo que representa un avance significativo para las células solares basadas en esquaraína.
Conclusiones:
- El enlace doble terminal en la cadena n-hexenila influye significativamente en el embalaje en estado sólido y el transporte de carga en los tintes cuadráneos.
- Las modificaciones estructurales, incluso pequeñas, pueden mejorar drásticamente el rendimiento de OPV.
- Estos hallazgos allanan el camino para el desarrollo de células solares orgánicas de alto rendimiento, procesadas en solución, basadas en la química de la cuadraína.
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