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Heterojunciones orgánicas formadas por la interfaz de dos cristales individuales de una solución mixta
Huanbin Li1,2, Jiake Wu1,2, Kohtaro Takahashi3
1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering , Zhejiang University , Hangzhou 310027 , China.
Journal of the American Chemical Society
|June 28, 2019
Resumen
Los investigadores desarrollaron un nuevo método para crear heterojunciones orgánicas de alta calidad utilizando cristales únicos. Esta técnica permite un control preciso del empaque molecular, lo que conduce a un mejor rendimiento en los dispositivos electrónicos orgánicos.
Área de la Ciencia:
- Ciencias de los materiales
- Productos electrónicos orgánicos
- La cristalografía
Sus antecedentes:
- Las heterojunciones orgánicas son componentes cruciales en la electrónica orgánica.
- Lograr un empaque molecular bien ordenado en las heterojunciones es un desafío.
- La formación de heterojunciones monocristalinas a partir de semiconductores orgánicos es difícil.
Objetivo del estudio:
- Desarrollar un método para crear heterojunciones orgánicas a partir de cristales únicos interfazados.
- Comprender los mecanismos de cristalización de los semiconductores orgánicos a partir de las gotas de solución.
- Investigar las propiedades de transporte de carga de las heterojunciones monocristalinas resultantes.
Principales métodos:
- Cristalización de seis semiconductores orgánicos a partir de gotas de solución mezclada en varios sustratos.
- Observación y análisis de los mecanismos de cristalización en las interfaces aire-solución y solución-sustrato.
- Fabricación y caracterización de transistores orgánicos de efecto de campo (OFET) utilizando las heterojunciones formadas.
Principales resultados:
- Se identificaron dos mecanismos de cristalización distintos basados en la preferencia de la interfaz (arriba o abajo).
- Se ha demostrado que la preferencia de cristalización es ajustable mediante la selección del sustrato, lo que indica la importancia de la interacción entre sustrato y semiconductor.
- Se han formado con éxito cristales simples de doble capa que producen heterojunciones orgánicas con transporte de carga ambipolar.
- Se ha logrado una alta movilidad de electrones de 1,90 cm2 V1 y una movilidad de agujeros de 1,02 cm2 V1.
Conclusiones:
- Elucidar los eventos de cristalización interfacial es clave para controlar la formación de heterojunciones orgánicas.
- El método desarrollado permite heterojunciones orgánicas monocristalinas cultivadas en solución con excelentes propiedades de transporte de carga.
- Este trabajo allana el camino para dispositivos electrónicos orgánicos avanzados que utilizan heterojunciones diseñadas con precisión.
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