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El transistor de túnel de efecto de campo basado en heteroestructuras verticales de grafeno
L Britnell1, R V Gorbachev, R Jalil
1School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.
Science (New York, N.Y.)
|February 4, 2012
Resumen
Los investigadores desarrollaron un transistor de grafeno superando las limitaciones del silicio. Este nuevo dispositivo logra una baja disipación de energía, allanando el camino para la electrónica avanzada y aplicaciones de alta frecuencia.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Física de la materia condensada Física de la materia condensada
- La nanoelectrónica es la nanoelectrónica.
Sus antecedentes:
- La falta de una brecha de energía del grafeno dificulta su uso en electrónica alternativa al silicio debido a la alta disipación de energía en estado OFF.
- Lograr una conmutación eficiente en los transistores basados en grafeno es crucial para las aplicaciones electrónicas de baja potencia.
Objetivo del estudio:
- Diseñar heteroestructuras de grafeno para transistores de efecto de campo bipolar (FET).
- Para superar la limitación de la brecha de energía intrínseca del grafeno para aplicaciones electrónicas.
- Para demostrar las capacidades de conmutación a temperatura ambiente en nuevos dispositivos de grafeno.
Principales métodos:
- Fabricación de heteroestructuras de grafeno utilizando nitruro de boro atómicamente delgado o disulfuro de molibdeno como barreras de transporte verticales.
- Caracterización del rendimiento del transistor de efecto de campo bipolar a temperatura ambiente.
- Explotación de la baja densidad de estados del grafeno y el grosor de la capa atómica.
Principales resultados:
- Se han demostrado relaciones de conmutación a temperatura ambiente de aproximadamente 50 con barreras de nitruro de boro.
- Logró significativamente más altas relaciones de conmutación de temperatura ambiente de aproximadamente 10.000 con barreras de disulfuro de molibdeno.
- Los dispositivos prototipo son prometedores para la baja disipación de energía en el estado OFF.
Conclusiones:
- Las heterosestructuras de grafeno con barreras de transporte específicas pueden crear FET bipolares funcionales.
- Estos dispositivos abordan el desafío crítico de la brecha de energía del grafeno para aplicaciones electrónicas.
- Los transistores desarrollados tienen potencial para el funcionamiento de alta frecuencia y la integración a gran escala en la electrónica futura.
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