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Adaptación de la dinámica de transferencia de carga entre capas en perovskitas 2D con moléculas espaciadoras
Yorrick Boeije1,2, Wouter T M Van Gompel3, Youcheng Zhang2,4
1Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, U.K.
Journal of the American Chemical Society
|September 22, 2023
Resumen
Los investigadores exploraron moléculas basadas en carbazol en perovskitas 2D, demostrando el acoplamiento electrónico sintonizable. Un acoplamiento más fuerte con cadenas más cortas mejora la transferencia de carga y la movilidad del portador para nuevos dispositivos optoelectrónicos.
Área de la Ciencia:
- Ciencias de los materiales
- Física del estado sólido
- Productos electrónicos orgánicos
Sus antecedentes:
- Las perovskitas híbridas orgánicas e inorgánicas son cruciales para la optoelectrónica.
- Típicamente, la subtela inorgánica dicta las propiedades de la perovskita debido a los componentes orgánicos inertes.
- Este trabajo investiga el papel de los cationes orgánicos electrónicamente activos.
Objetivo del estudio:
- Para investigar la fotofísica y el transporte de carga de las perovskitas 2D basadas en carbazolos, (Cz-C) 2PbI4.
- Demostrar el acoplamiento electrónico sintonizable entre capas inorgánicas y orgánicas mediante la variación de la longitud de la cadena de alquilamonio.
- Explorar el potencial para el diseño de perovskitas 2D con propiedades electrónicas inorgánicas y orgánicas combinadas.
Principales métodos:
- Síntesis de perovskitas 2D (Cz-C) 2 PbI 4 con diferentes longitudes de la cadena de alquilamonio (i>=3-5).
- Caracterización fotofísica mediante espectroscopia de absorción transitoria ultrarrápida.
- Mediciones de transporte de carga y espectroscopia de deflexión fototérmica.
Principales resultados:
- Acoplamiento electrónico sintonizable demostrado entre capas inorgánicas y orgánicas, más fuerte para (Cz-C3) 2 PbI4.
- Transferencia de agujero ultra rápida observada desde la capa de haluro de plomo a las moléculas de carbazol, aumentando con las longitudes de cadena más cortas (i=5 a i=3).
- Se han logrado portadores de larga vida (10-100 ns) y una mayor movilidad de los portadores fuera del plano con un acoplamiento mejorado entre capas.
Conclusiones:
- Los cationes orgánicos electrónicamente activos pueden influir significativamente en las propiedades electrónicas de las perovskitas 2D.
- El diseño racional de los cationes orgánicos permite ajustar el acoplamiento electrónico entre capas y la dinámica de transferencia de carga.
- Este enfoque ofrece una vía para desarrollar perovskitas 2D avanzadas con funcionalidades optoelectrónicas a medida.
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