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Conductores moleculares basados en benzotieno-benzotiofeno: alta conductividad, gran factor de potencia

Yasuhiro Kiyota¹, Tomofumi Kadoya¹, Kaoru Yamamoto²

¹Department of Organic and Polymeric Materials, Tokyo Institute of Technology , O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan.

Journal of the American Chemical Society

|March 5, 2016

Resumen

Los metales orgánicos altamente conductores basados en el benzotieno [3,2-b] [1] (BTBT) exhiben un alto rendimiento termoeléctrico. Estos materiales pasan a un estado aislante a bajas temperaturas debido a las ondas de densidad de carga.

Área de la Ciencia:

Ciencias de los materiales
Física de la materia condensada
Productos electrónicos orgánicos

Sus antecedentes:

El benzotieno [3,2-b] [1] (BTBT) es un material semiconductor orgánico prometedor.
El desarrollo de materiales orgánicos altamente conductores es crucial para las aplicaciones electrónicas avanzadas.

Objetivo del estudio:

Sintetizar e investigar las propiedades estructurales y físicas de nuevos metales orgánicos basados en BTBT.
Explorar el potencial de estos materiales como generadores térmicos orgánicos.

Principales métodos:

Síntesis de las sales de (BTBT) 2XF6 (X = P, As, Sb, Ta).
Medición de la conductividad eléctrica, la potencia termoeléctrica y el espectro de reflectancia.
Análisis de la resistividad a baja temperatura, susceptibilidad al espín paramagnético, espectros Raman e IR.

Principales resultados:

Se logra una alta conductividad a temperatura ambiente de hasta 4100 S cm(-1) con una movilidad de deriva de 16 cm(2) V(-1) s(-1) para la sal AsF6.
Se ha demostrado un factor de potencia termoeléctrica significativo (55-88 μW K ((-2) m ((-1))), lo que indica el potencial para aplicaciones termoeléctricas orgánicas.
Se observó un salto abrupto de resistividad por debajo de 200 K, lo que lleva a un estado aislante por debajo de 60 K, atribuido a ondas de densidad de carga de 4kF.

Conclusiones:

Las sales sintetizadas (BTBT) 2XF6 representan metales orgánicos altamente conductores con propiedades termoeléctricas prometedoras.
El comportamiento aislante a baja temperatura está vinculado a la formación de ondas de densidad de carga, lo que proporciona información sobre las transiciones de fase electrónica de los conductores orgánicos.

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