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Variación de la conductividad eléctrica continua en las aleaciones de hexaiminotrifenileno (M = Co, Ni, Cu)

Tianyang Chen¹, Jin-Hu Dou¹, Luming Yang¹

¹Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society

|June 14, 2020

Resumen

Los investigadores crearon aleaciones binarias sintonizables de estructuras metálicas orgánicas, controlando con precisión la conductividad eléctrica y las brechas de banda. Este avance ofrece nuevas posibilidades para los materiales electrónicos mediante el ajuste fino de las propiedades a través de la sustitución de metales.

Área de la Ciencia:

Ciencias de los materiales
Física de la materia condensada
Química

Sus antecedentes:

Las estructuras metálicas orgánicas bidimensionales conductoras de electricidad (MOF) como M ₃ exhiben propiedades electrónicas únicas.
El ajuste fino de las propiedades electrónicas de los MOF es crucial para aplicaciones electrónicas avanzadas.

Objetivo del estudio:

Investigar el ajuste continuo de las brechas de banda y la conductividad eléctrica en aleaciones binarias de M ₃ HITP) ₂ MOF.
Para entender la relación entre la composición del metal, la estructura y las propiedades electrónicas.

Principales métodos:

Síntesis de aleaciones binarias altamente cristalinas (M M'_3-) (HITP) ₂ (MM' = CuNi, CoNi, CoCu) con composiciones metálicas controladas.
Caracterización de las brechas de banda y de la conductividad eléctrica en toda la serie de aleaciones.
Análisis de factores estructurales como el espaciamiento entre capas y las concentraciones de portadores libres.

Principales resultados:

Se ha logrado un ajuste continuo a escala fina de brechas de banda de más de 0,4 eV y una conductividad eléctrica de más de 4 órdenes de magnitud.
Se ha demostrado un control preciso de la composición metálica en aleaciones isostruturales binarias de MOF.
Ajuste de propiedades atribuido a los cambios en las concentraciones de portadores libres y el espaciamiento entre capas influenciado por la sustitución de metales.

Conclusiones:

La sustitución de metales en aleaciones HITP proporciona una ruta versátil para afinar las propiedades electrónicas.
El escalamiento inverso observado de la energía de activación con el porcentaje de Ni en (CoNi_3-) ₂ confirma el transporte a granel activado térmicamente.

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