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Movilidad de carga excepcional por transporte de banda en marcos orgánicos covalentes semiconductores bidimensionales
Shuai Fu1, Enquan Jin1,2, Hiroki Hanayama3
1Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz D-55128, Germany.
Journal of the American Chemical Society
|April 14, 2022
Resumen
Los marcos orgánicos covalentes bidimensionales de alta conductividad (2D COF) son prometedores para la electrónica. Las nuevas películas delgadas TPB-TFB COF presentan una movilidad de carga récord, lo que permite un transporte eficiente de carga en materiales porosos.
Área de la Ciencia:
- Ciencias de los materiales
- Productos electrónicos orgánicos
- Nanotecnología
Sus antecedentes:
- Los marcos orgánicos covalentes bidimensionales (2D COF) son polímeros porosos cristalinos con potencial en electrónica, catálisis, detección y almacenamiento de energía.
- El desarrollo de COFs 2D altamente conductores es un desafío debido a la limitada conjugación π y localización de carga en los límites del grano.
- Los mecanismos de transporte de carga dentro de los marcos cristalinos de COF 2D no se comprenden bien.
Objetivo del estudio:
- Investigar las propiedades de transporte de carga de las películas delgadas semiconductoras 2D de COF.
- Explorar el potencial de las TPB-TFB para aplicaciones en electrónica orgánica y catálisis.
- Obtener información sobre el diseño de materiales porosos altamente cristalinos para el transporte eficiente de cargas.
Principales métodos:
- Síntesis de películas delgadas de COF en 2D mediante el uso de 1,3,5-tris(4-aminofenil) benceno (TPB) y 1,3,5-triformilbenceno (TFB).
- Espectroscopia de terahercios con resolución de tiempo y frecuencia para sondear la dinámica del portador de carga.
- Medición de la fotoconductividad y la movilidad del portador de carga.
Principales resultados:
- La espectroscopia de terahercios reveló intrínsecamente el transporte en banda del tipo Drude de los portadores de carga en películas delgadas de TPB-TFB COF.
- Las películas delgadas de TPB-TFB COF exhibieron una alta fotoconductividad con un tiempo de dispersión de carga superior a 70 fs a temperatura ambiente.
- Se logró una movilidad de carga récord de 165 ± 10 cm2 V-1 s-1, superando los COF conductores existentes.
Conclusiones:
- Las películas delgadas de TPB-TFB COF demuestran un transporte de carga eficiente y de largo alcance, parecido a los materiales inorgánicos cristalinos.
- Estos hallazgos posicionan a los TPB-TFB COF como fuertes candidatos para la electrónica orgánica y la catálisis de próxima generación.
- El estudio proporciona una base para el diseño racional de materiales porosos avanzados con propiedades electrónicas a medida.
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