Two Distinct Transitions in CuxInS2 Quantum Dots. Bandgap versus Sub-Bandgap Excitations in Copper-Deficient Structures

Danilo H. Jara, Kevin G. Stamplecoskie, Prashant V. Kamat

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

77 Citas (Scopus)

Resumen

Cu-deficient CuInS2 quantum dots (QDs) synthesized by varying the [Cu]:[In] ratio allow modulation of optical properties as well as identification of the radiative emission pathways. Absorption and emission spectral features showed a strong dependence on the [Cu]:[In] ratio of CuxInS2 QDs, indicating two independent optical transitions. These effects are pronounced in transient absorption spectra. The bleaching of band edge absorption and broad tail absorption bands in the subpicosecond-nanosecond time scale provide further evidence for the dual optical transitions. The recombination process as monitored by photoemission decay indicated the involvement of surface traps in addition to the bandgap and sub-bandgap transitions. Better understanding of the origin of the optical transitions and their influence on the photodynamics will enable utilization of ternary semiconductor quantum dots in display and photovoltaic devices.

Idioma originalInglés
Páginas (desde-hasta)1452-1459
Número de páginas8
PublicaciónJournal of Physical Chemistry Letters
Volumen7
N.º8
DOI
EstadoPublicada - 5 may 2016
Publicado de forma externa

Áreas temáticas de ASJC Scopus

  • Ciencia de los materiales (todo)
  • Química física y teórica

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