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Dinámica de estado excitado en marcos orgánicos covalentes 2D totalmente conjugados

Andreas C Jakowetz^1,2, Ture F Hinrichsen², Laura Ascherl¹

¹Department of Chemistry and Center for NanoScience (CeNS) , University of Munich (LMU) , Butenandtstrasse 5-13 , 81377 Munich , Germany.

Journal of the American Chemical Society

|July 16, 2019

Resumen

Los investigadores estudiaron la dinámica del estado excitado en marcos orgánicos covalentes conjugados (COF). Encontraron un modelo unificado para la generación de carga a través de la aniquilación de singlet-singlet, crucial para las aplicaciones de dispositivos optoelectrónicos.

Área de la Ciencia:

Ciencias de los materiales
Química
La física

Sus antecedentes:

Las estructuras orgánicas covalentes (COF) son materiales porosos sintonizables con diversas aplicaciones.
Comprender la dinámica del estado excitado es clave para los COF en dispositivos electrónicos como los transistores y las células solares.

Objetivo del estudio:

Investigar la dinámica de estado excitado ultrarrápido en COFs 2D totalmente conjugados.
Desarrollar un modelo unificado para la generación de carga y los mecanismos de desintegración.

Principales métodos:

Se empleó la espectroscopia de absorción transitoria.
Se analizó una serie de COF 2D con diferentes topologías y cromóforos.

Principales resultados:

Los estados excitados exhibieron un comportamiento similar en diferentes estructuras de COF.
Un modelo unificado reveló una rápida aniquilación de singlet-singlet generando cargas.
La vida útil de carga observada se extendió a decenas de microsegundos.

Conclusiones:

La aniquilación singlet-singlet es una vía primaria de generación de carga en estos COF.
Las cargas de larga duración son prometedoras para aplicaciones optoelectrónicas.
El control de la aniquilación de singlet-singlet puede mejorar los rendimientos de carga separada.

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