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El anclaje de la red estabiliza los semiconductores procesados en solución

Mengxia Liu1, Yuelang Chen2, Chih-Shan Tan1

  • 1Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada.

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|May 24, 2019
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron nuevos materiales híbridos que combinan perovskitas y puntos cuánticos coloidales (CQD) para mejorar la estabilidad del semiconductor. Este enfoque anclado en celosía mejora la durabilidad del material para aplicaciones optoelectrónicas.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Nanotecnología
  • Física de los semiconductores

Sus antecedentes:

  • Los semiconductores procesados en solución requieren una mayor estabilidad para un uso generalizado.
  • Las perovskitas inorgánicas de haluro de plomo y cesio ofrecen espacios de banda adecuados para las células solares en tándem, pero sufren transiciones de fase indeseables.
  • Los puntos cuánticos coloidales (CQD) proporcionan espacios de banda ajustables, pero enfrentan problemas de estabilidad debido a la agregación y la oxidación.

Objetivo del estudio:

  • Para crear materiales híbridos "anclados en celosía" mediante la combinación de perovskitas de haluro de plomo de cesio con CQD de calogenuro de plomo.
  • Mejorar la estabilidad y el rendimiento de estos materiales híbridos para dispositivos optoelectrónicos.
  • Investigar los efectos sinérgicos del emparejamiento de celosía entre perovskitas y CQD en las propiedades del material.

Principales métodos:

  • Fabricación de materiales híbridos que integran perovskitas de haluro de plomo de cesio y CQD de calogenuro de plomo.
  • Caracterización de la estabilidad del material a temperaturas ambientales y elevadas.
  • Evaluación de la eficiencia cuántica de la fotoluminiscencia y la movilidad del portador de carga.

Principales resultados:

  • El emparejamiento de la red entre las perovskitas y los CQD suprime las transiciones de fase de perovskitas no deseadas.
  • Los materiales híbridos exhiben una mayor estabilidad al aire (mejora de orden de magnitud) y estabilidad térmica (estable durante horas a 200 °C).
  • La matriz de perovskita previene la oxidación de CQD y reduce la aglomeración de nanopartículas, al tiempo que mejora la movilidad del portador de carga.

Conclusiones:

  • Los materiales híbridos anclados en red ofrecen una estabilidad y un rendimiento superiores en comparación con los componentes individuales.
  • Estos nuevos materiales demuestran un potencial significativo para el avance de los dispositivos optoelectrónicos procesados por solución.
  • La integración sinérgica de perovskitas y CQD presenta una estrategia prometedora para las tecnologías de semiconductores de próxima generación.