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La curvatura inducida por la tensión anisotrópica en las heteroestructuras de nanorodos CdSe/CdTe tipo II
Hunter McDaniel1, Jian-Min Zuo, Moonsub Shim
1Department of Materials Science and Engineering and Frederic Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
Journal of the American Chemical Society
|February 19, 2010
Resumen
Las heteroestructuras de selenuro de cadmio/telururo de cadmio (CdSe/CdTe) sintetizadas exhiben una curvatura inducida por la tensión. Esta curvatura controlada ofrece nuevas vías para dirigir los portadores fotogenerados en las heteroestructuras de nanorod para aplicaciones energéticas.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
- Física del estado sólido Física del estado sólido
Sus antecedentes:
- Las heteroestructuras de compensación de banda tipo II son cruciales para los dispositivos optoelectrónicos.
- El control de la morfología de la nanoestructura es clave para afinar las propiedades de los materiales.
- La ingeniería de deformación en nanomateriales puede alterar significativamente las características electrónicas y ópticas.
Objetivo del estudio:
- Para sintetizar y caracterizar las curvas y lineal CdSe / CdTe nanorod heterostructures.
- Investigar los orígenes de la cepa y su efecto en la morfología del nanorod.
- Explorar el potencial del control de deformación para aplicaciones energéticas.
Principales métodos:
- Síntesis de las heteroestructuras de nanorodo CdSe/CdTe.
- Microscopía electrónica de transmisión de resolución atómica (ARTEM) para el análisis estructural.
- Análisis de deformación para comprender las distorsiones de la red.
Principales resultados:
- La tensión de la falta de coincidencia de la celosía en el crecimiento de CdTe en semillas de CdSe induce curvatura en nanorods.
- Los nanorods curvos exhiben una expansión de la red que excede el desajuste esperado debido a la tensión de compresión en CdSe.
- Las heteroestructuras lineales formadas por el crecimiento de la punta no muestran curvatura inducida por la tensión.
Conclusiones:
- La cepa de celosía anisotrópica puede ser controlada por diferentes condiciones de crecimiento.
- La ingeniería de deformación en nanorods CdSe / CdTe ofrece una ruta para adaptar la estructura electrónica.
- Este control facilita la orientación de los transportadores fotogenerados para aplicaciones energéticas avanzadas.
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