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Impacto de los aniones fluorados en los conductores orgánicos mixtos

Garrett W Collins¹, Kierra S Forthman¹, Seth R Jackson¹

¹Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States.

ACS applied materials & interfaces

|August 22, 2025

Resumen

Los aniones fluorados afectan el rendimiento del transistor electroquímico orgánico (OECT) al alterar la estructura del polímero, generalmente aumentando la movilidad del portador de carga, pero no mejorando universalmente la función del dispositivo. La selección cuidadosa de electrolitos es crucial para los dispositivos OMIEC.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Ciencias de los Polímeros

Sus antecedentes:

Los conductores iónico-electrónicos mixtos orgánicos (OMIEC) son vitales para la bioelectrónica y la computación neuromórfica.
Los iones fluorados a menudo mejoran el rendimiento OMIEC en transistores electroquímicos orgánicos (OECT), pero se desconoce la universalidad de este efecto.

Objetivo del estudio:

Investigar el impacto específico de los aniones fluorados en el dopaje electroquímico de un polímero conjugado.
Comparar los efectos de los aniones fluorados frente a los no fluorados en la microestructura y las propiedades electroquímicas del polímero.

Principales métodos:

Microequilibrio electroquímico de cristal de cuarzo (EQCM) para controlar los cambios de masa durante el dopaje.
Operando dispersión de rayos X de incidencia de pastoreo en ángulo amplio (GIWAXS) para analizar los cambios estructurales bajo tensión.
Comparación de aniones fluorados y no fluorados con estructuras químicas idénticas.

Principales resultados:

Los aniones fluorados alteran significativamente las regiones amorfas en el polímero poli ((2- ((3,3'-bis ((2- ((2-methoxyethoxy) ethoxy) ethoxy) - [2,2'-bithiophen]-5-yl) thieno [3,2-b] thiophene) (p ((g2T-TT)).
La fluoración conduce a la expulsión de agua y/o cationes de la matriz del polímero.
La movilidad del portador de carga generalmente aumenta con los aniones fluorados, pero la mejora del rendimiento de OECT no es universal.

Conclusiones:

La fluoración de aniones tiene un efecto complejo sobre el dopaje y la estructura de OMIEC.
Si bien la movilidad del portador de carga puede mejorar, la fluoración no garantiza un rendimiento mejorado de OECT.
Los hallazgos destacan la necesidad de una selección matizada de electrolitos en el desarrollo de dispositivos OMIEC.

Palabras clave:

Diseminación de rayos X Propiedades de los electrolitos transporte de iones Transistor electroquímico orgánico Productos electrónicos orgánicos Conductor orgánico mezclado

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