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Recolección de carga de banda ancha ultrarrápida desde la interfaz de grafeno limpio
Hao Hong1, Jincan Zhang2, Jin Zhang3
1State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Centre of Quantum Matter, School of Physics , Peking University , Beijing 100871 , China.
Journal of the American Chemical Society
|October 25, 2018
Resumen
Los investigadores lograron una recolección de carga de banda ancha ultrarrápida utilizando una interfaz limpia de grafeno y perovskita. Este avance en la optoelectrónica promete una mayor eficiencia de conversión de corriente y energía para los dispositivos fotovoltaicos.
Área de la Ciencia:
- Ciencias de los materiales
- Optoelectrónica y sus derivados
- Las instalaciones fotovoltaicas
Sus antecedentes:
- La recolección eficiente de cargas es crucial para los dispositivos optoelectrónicos y fotovoltaicos.
- La recolección de carga ultra rápida y de banda ancha es clave para mejorar la eficiencia de la conversión de corriente y energía.
Objetivo del estudio:
- Demostrar la recolección simultánea de carga ultrarrápida y de banda ancha en una interfaz limpia grafeno/perovskita.
- Para investigar la dinámica de recolección de carga en esta nueva interfaz.
Principales métodos:
- Crecimiento directo de perovskita en el grafeno para asegurar una interfaz limpia.
- Espectroscopia de sonda de bomba ajustable en dos colores.
- Espectroscopia de fotoluminiscencia con resolución de tiempo.
- Cálculos de la teoría funcional de la densidad dependiente del tiempo.
Principales resultados:
- Se ha logrado una recopilación de carga de banda ancha ultra rápida (~ 100 fs) de fototransportadores de borde de banda.
- Eficiencia demostrada de recolección de corriente cercana a la unidad (~99%).
- El grafeno extrajo portadores calientes en ~ 50 fs, superando las tasas de enfriamiento intrínsecas de la perovskita.
- Destacó la estructura de banda lineal Dirac única del grafeno para una extracción eficiente del portador caliente.
Conclusiones:
- Una interfaz limpia entre grafeno y perovskita permite la recolección simultánea de cargas ultrarrápida y de banda ancha.
- El grafeno actúa como una capa de recolección de carga ideal debido a sus propiedades y estructura de banda de Dirac.
- Este enfoque ofrece potencial para dispositivos optoelectrónicos y fotovoltaicos de alta eficiencia, que posiblemente superen el límite de Shockley-Queisser.
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