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Control eléctrico de la temperatura ambiente del flujo de excitación en una heteroestructura de van der Waals
Dmitrii Unuchek1,2, Alberto Ciarrocchi1,2, Ahmet Avsar1,2
1Electrical Engineering Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
Nature
|July 27, 2018
Resumen
El funcionamiento a temperatura ambiente de los dispositivos excitónicos ahora es posible utilizando semiconductores bidimensionales. Los investigadores demostraron la acción del transistor en las heteroestructuras MoS2-WSe2, lo que permite interconexiones óptico-eléctricas eficientes.
Área de la Ciencia:
- Física de la materia condensada
- Ciencias de los materiales
- Nanotecnología
Sus antecedentes:
- Los dispositivos basados en excitones ofrecen potencial para interconexiones óptico-eléctricas.
- Las demostraciones anteriores de transistores de excitón requerían bajas temperaturas, lo que limitaba el uso práctico.
- Los semiconductores bidimensionales (2D) poseen altas energías de unión de excitones, lo que permite el funcionamiento a temperatura ambiente.
Objetivo del estudio:
- Para demostrar la acción del transistor a temperatura ambiente en los dispositivos excitónicos.
- Para superar las cortas longitudes de difusión de excitones en materiales 2D individuales.
- Permitir interconexiones eficientes entre la transmisión óptica de datos y el procesamiento eléctrico.
Principales métodos:
- Fabricación de las heteroestructuras de MoS2-WSe2 van der Waals encapsuladas en nitruro de boro hexagonal.
- Demostración de la acción del transistor controlado eléctricamente a temperatura ambiente.
- Manipulación de la dinámica del excitón utilizando potenciales eléctricamente reconfigurables.
Principales resultados:
- Se logra una acción de transistor controlada eléctricamente a temperatura ambiente.
- Se han observado excitones de larga vida entre capas con distancias de difusión de hasta cinco micrómetros.
- Control demostrado sobre el flujo de excitación utilizando potenciales sintonizables.
Conclusiones:
- Las heteroestructuras de semiconductores 2D permiten el funcionamiento a temperatura ambiente de los dispositivos excitónicos.
- Estos dispositivos son prometedores para las interconexiones óptico-eléctricas eficientes.
- La capacidad de manipular la dinámica del excitón es crucial para los futuros circuitos excitónicos.
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