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Solution-Processed "Silver-Bismuth-Iodine" Ternary Thin Films for Lead-Free Photovoltaic Absorbers
Published on: September 27, 2018
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Dichalcogenidos de bismuto de sodio cultivados en solución: hacia semiconductores biocompatibles abundantes en la
Journal of the American Chemical Society
|February 17, 2018
Resumen
Los investigadores desarrollaron una nueva síntesis de bajo costo para semiconductores ternários abundantes en la Tierra. Estos materiales respetuosos con el medio ambiente presentan espacios de banda ideales para aplicaciones de celdas solares.
Área de la Ciencia:
- Ciencias de los materiales
- Química del estado sólido
- Nanotecnología
Sus antecedentes:
- Muchos semiconductores actuales se basan en elementos tóxicos, escasos o caros como el cadmio (Cd), el plomo (Pb), el arsénico (As), el litio (Li) y el indio (In).
- Los altos costos de fabricación a menudo están asociados con los métodos tradicionales de producción de semiconductores.
Objetivo del estudio:
- Desarrollar una síntesis fácil, general y a baja temperatura para nuevos semiconductores ternales APnE2.
- Explorar el potencial de los elementos abundantes en la Tierra y biocompatibles para aplicaciones de semiconductores.
- Identificar nuevos materiales para tecnologías eficientes de conversión de energía.
Principales métodos:
- Síntesis en fase de solución de semiconductores ternales APnE2 con tamaños ajustables (4-28 nm).
- Utilizando elementos abundantes en la Tierra como el sodio (Na), el bismuto (Bi), el azufre (S) y el selenio (Se).
- Investigación computacional de las estructuras y propiedades del material.
Principales resultados:
- Síntesis exitosa de semiconductores ternales APnE2 con ajuste de tamaño.
- Las brechas de banda experimental observadas oscilan entre 1,20 y 1,45 eV, adecuadas para las células solares.
- El análisis computacional confirmó propiedades estructurales consistentes con materiales conocidos.
Conclusiones:
- Se ha sintetizado una nueva clase de semiconductores ternários de bajo costo y respetuosos con el medio ambiente.
- Estos materiales ofrecen propiedades prometedoras para aplicaciones de conversión de energía, en particular células solares.
- El método de síntesis fácil abre caminos para una mayor exploración de materiales semiconductores sostenibles.
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