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GeSe 2 anisotrópico estable en el aire para fotodetección altamente sensible a la polarización en la región de onda
Yusi Yang1,2, Shun-Chang Liu1,3, Wei Yang2
1CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Research Center for Molecular Sciences, CAS Research/Education Center for Excellence in Molecule Science , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China.
Journal of the American Chemical Society
|March 2, 2018
Resumen
El diselenuro de germanio (GeSe2) es un nuevo material bidimensional (2D) de banda ancha con anisotropía en el plano. Muestra una fotodetección sensible a la polarización prometedora en la región de onda corta y una excelente estabilidad del aire.
Área de la Ciencia:
- Ciencias de los materiales
- Física de la materia condensada
- Nanotecnología
Sus antecedentes:
- Los materiales bidimensionales (2D) con anisotropía en el plano ofrecen propiedades electrónicas y ópticas únicas.
- Los materiales 2D anisotrópicos existentes son semiconductores de banda estrecha, lo que limita las aplicaciones en la optoelectrónica de onda corta.
- Existe la necesidad de materiales 2D anisotrópicos de banda ancha con mayor estabilidad.
Objetivo del estudio:
- Introducir el diselenuro de germanio (GeSe2) como un nuevo material anisotrópico de banda ancha en 2D.
- Investigar sistemáticamente las propiedades estructurales, vibratorias, eléctricas y ópticas de GeSe2.
- Evaluar el potencial de GeSe2 para los dispositivos optoelectrónicos sensibles a la polarización.
Principales métodos:
- Cálculos teóricos (teoría funcional de la densidad) para determinar la estructura de la banda electrónica y las energías de interacción superficial.
- Síntesis experimental y caracterización de las escamas exfoliadas de GeSe2.
- Fabricación y ensayo de fotodetectores basados en GeSe2.
Principales resultados:
- GeSe2 exhibe una amplia brecha de banda de 2,74 eV y una significativa anisotropía de absorción óptica en el plano.
- Los fotodetectores fabricados con GeSe2 demuestran una fotorrespuesta altamente sensible a la polarización en la región de onda corta.
- GeSe2 muestra una estabilidad al aire excepcional con una alta energía de activación de quimiosorbción de oxígeno (2,12 eV), que supera significativamente la del fósforo negro.
Conclusiones:
- GeSe2 es un material 2D anisotrópico de banda ancha prometedor para la optoelectrónica de onda corta.
- Sus propiedades únicas, incluida la sensibilidad a la polarización y la estabilidad al aire, lo hacen adecuado para aplicaciones de dispositivos avanzados.
- GeSe2 amplía la familia de materiales anisotrópicos 2D, abriendo nuevas vías para la investigación y el desarrollo.
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