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Respuesta flexoeléctrica mejorada en semiconductores de óxido
Jackeline Narvaez1, Fabian Vasquez-Sancho1,2, Gustau Catalan1,3
1Institut Catala de Nanociencia i Nanotecnologia (ICN2), CSIC and The Barcelona Institute of Nanoscience and Technology (BIST), Campus UAB, 08193 Barcelona, Spain.
Nature
|September 27, 2016
Resumen
Los semiconductores exhiben un efecto flexoeléctrico significativamente mayor que los aislantes cuando se doblan. El dopaje aumenta la conductividad, mejorando esta respuesta electromecánica para aplicaciones de transductores.
Área de la Ciencia:
- Ciencias de los materiales
- Física del estado sólido
- Fenómenos electromecánicos
Sus antecedentes:
- La flexoelectricidad describe la polarización del material debido a gradientes de deformación, como la flexión.
- Tradicionalmente se considera una propiedad de los aislantes dieléctricos.
- Los semiconductores también pueden exhibir flexoelectricidad redistribuyendo carga libre bajo gradientes de deformación.
Objetivo del estudio:
- Investigar y demostrar la respuesta flexoeléctrica en los semiconductores.
- Explorar métodos para mejorar el efecto flexoeléctrico en materiales semiconductores.
- Evaluar el potencial de los semiconductores en aplicaciones de transductores electromecánicos.
Principales métodos:
- Curvado de materiales semiconductores para inducir gradientes de deformación.
- Dopado de cristales únicos de óxidos de banda ancha para modificar la conductividad.
- Medición del coeficiente flexoeléctrico efectivo en muestras dopadas y no dopadas.
Principales resultados:
- La flexión de semiconductores genera una respuesta de tipo flexoeléctrico.
- Esta respuesta en semiconductores puede ser significativamente mayor que en aislantes.
- El dopaje aumentó el coeficiente flexoeléctrico efectivo en órdenes de magnitud.
- Un mecanismo de capa de barrera explica la respuesta mejorada en la macroscala.
Conclusiones:
- Los semiconductores pueden exhibir un fuerte efecto flexoeléctrico, superior al de los aislantes.
- La respuesta flexoeléctrica en semiconductores es ajustable a través del dopaje y la conductividad.
- Los semiconductores ofrecen potencial como materiales activos para los transductores electromecánicos.
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