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Definir el valor de la corriente de inyección y el área efectiva de contacto eléctrico para las uniones de túneles
Felice C Simeone1, Hyo Jae Yoon, Martin M Thuo
1Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts 02138, United States.
Journal of the American Chemical Society
|November 6, 2013
Resumen
Medimos el transporte de carga a través de monocapas autoensambladas (SAM) y determinamos la densidad de corriente del túnel de inyección (J0). Nuestros hallazgos revelan que J0 es 10±7.6±0.8) A·cm±-2), crucial para la comprensión de la electrónica molecular y el transporte de carga.
Área de la Ciencia:
- Química Física es la química física.
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Comprender el transporte de carga a través de monocapas autoensambladas (SAM) es fundamental para la electrónica molecular.
- Los estudios anteriores a menudo se basaron en extrapolaciones para determinar los parámetros fundamentales de transporte.
- La medición precisa de la densidad de corriente requiere una contabilidad precisa de las áreas de contacto efectivas.
Objetivo del estudio:
- Para determinar con precisión la densidad de corriente del túnel de inyección (J0) a través de SAM sin extrapolación de longitud.
- Investigar el papel de la rugosidad de la superficie en la determinación del área efectiva de contacto eléctrico.
- Evaluar la idoneidad de los electrodos basados en EGaIn para estudios de transporte de carga en SAM.
Principales métodos:
- Fabricación de Ag ((TS) -SAM//Ga2O3/EGaIn en las uniones.
- Medición de las densidades de corriente a través de SAMs con diferentes longitudes (n=1-18).
- Análisis de la rugosidad de la superficie para determinar el área efectiva de contacto eléctrico.
- Cálculo de J0 y factor de decaimiento de túnel (β).
Principales resultados:
- La estimación inicial de J0 (suponiendo que el área geométrica = área efectiva) fue de 103.6±0.3 A·cm-2).
- El análisis detallado reveló que el área efectiva de contacto eléctrico es ~ 10 (−4) del área geométrica debido a la rugosidad.
- Corregido J0(+0.5 V) = 10(7.6±0.8) A·cm(-2), consistente con otros materiales de electrodo.
- El factor de desintegración del túnel β = 0,75 ± 0,02 Å(-1) se encuentra dentro del rango aceptado.
Conclusiones:
- Los electrodos basados en EGaIn proporcionan un método confiable para medir el transporte de carga a través de SAMs.
- La determinación precisa del área de contacto efectiva es esencial para cuantificar J0.
- La tecnología es adecuada para estudios físico-orgánicos de los fenómenos de transporte de carga.
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