Synthesis and characterization of strongly luminescing ZnS-capped CdSe nanocrystals

Journal Article · Thu Jan 11 00:00:00 EST 1996 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/jp9530562· OSTI ID:196641

Hines, M A; Guyot-Sionnest, P ^[1]

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1. Univ. of Chicago, IL (United States)

We describe the synthesis of ZnS-capped CdSe semiconductor nanocrystals using organometallic reagents by a two-step single-flask method. X-ray photoelectron spectroscopy, transmission electron microscopy and optical absorption are consistent with nanocrystals containing a core of nearly monodisperse CdSe of 27-30 A diameter with a ZnS capping 6{+-}3 A thick. The ZnS capping with a higher bandgap than CdSe passivates the core crystallite removing the surface traps. The nanocrystals exhibit strong and stable band-edge luminescence with a 50% quantum yield at room temperature. 23 refs., 4 figs.

• OSTI ID: 196641
• Journal Information: Journal of Physical Chemistry, Vol. 100, Issue 2; Other Information: PBD: 11 Jan 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
40 CHEMISTRY
CADMIUM SELENIDES
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
SEMICONDUCTOR MATERIALS
LUMINESCENCE
ZINC SULFIDES
ORGANOMETALLIC COMPOUNDS
X-RAY SPECTRA