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Movilidad de alto efecto de campo de polímeros conjugados de baja cristalinidad con agregados localizados
Sung Y Son1, Yebyeol Kim1, Junwoo Lee1
1Department of Chemical Engineering, Pohang University of Science and Technology , San 31, Nam-gu, Pohang, Gyeongbuk 790-780, Korea.
Journal of the American Chemical Society
|May 7, 2016
Resumen
Los investigadores mejoraron el transporte del portador de carga en polímeros conjugados mediante la creación de agregados localizados en regiones amorfas. Esta estrategia, utilizando la densidad de la cadena lateral controlada, mejoró la movilidad del efecto de campo sin sacrificar las propiedades mecánicas de la electrónica blanda.
Área de la Ciencia:
- Ciencias de los materiales
- Productos electrónicos orgánicos
- Química de los polímeros
Sus antecedentes:
- La movilidad del portador de carga en polímeros conjugados está limitada por el equilibrio entre las regiones cristalina y amorfa.
- La alta cristalinidad mejora el transporte de carga, pero compromete la flexibilidad mecánica, crucial para la electrónica blanda.
- Los métodos existentes para aumentar la cristalinidad se enfrentan a limitaciones inherentes y pueden no ser adecuados para aplicaciones flexibles.
Objetivo del estudio:
- Desarrollar una nueva estrategia para mejorar el transporte de cargas en polímeros conjugados.
- Mejorar la deslocalización y la conectividad de los portadores de carga dentro de las regiones amorfas.
- Lograr una alta movilidad del portador de carga sin comprometer las propiedades mecánicas de los polímeros conjugados para la electrónica blanda.
Principales métodos:
- Se desarrolló una nueva estrategia mediante la modulación de la densidad de las cadenas laterales aleatorias de copolímero alquilo.
- El obstáculo estérico de las cadenas laterales se controló para generar agregados localizados a través de la superposición π-orbital en regiones amorfas.
- Se realizaron mediciones de movilidad de efecto de campo para evaluar la eficiencia del transporte de carga.
Principales resultados:
- Un polímero aleatorio con baja densidad de cadena lateral de alquilo y baja cristalinidad exhibió una movilidad de efecto de campo significativamente mejorada (1,37 cm2/ (V·s)).
- Esta movilidad supera a la del poli-hexiltiofeno altamente cristalino.
- La estrategia formó con éxito agregados localizados en regiones amorfas, mejorando la conectividad de los portadores de carga.
Conclusiones:
- El aumento de la conectividad de la cadena de polímeros a través de agregados localizados en regiones amorfas es un enfoque más efectivo para el transporte eficiente de cargas que el mero aumento de la cristalinidad.
- La modulación de la densidad de la cadena lateral ofrece un método simple y eficaz para diseñar el transporte de carga en polímeros conjugados.
- Este enfoque es prometedor para el desarrollo de polímeros conjugados de alto rendimiento para aplicaciones electrónicas blandas.
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