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Proceedings Paper

Isocrystalline core/shell synthesis of high-quality II-VI diluted magnetic semiconductor quantum dots: ligand-field spectroscopic studies
Author(s): Pavle V. Radovanovic; Daniel R. Gamelin
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Paper Abstract

Ligand field electronic absorption spectroscopy has been applied as a direct probe of Co2+ dopant ions in II-VI based diluted magnetic semiconductor quantum dots. Synthesis of Co2+-doped CdS (Co2+:CdS) quantum dots by simple coprecipitation in inverted micelle solutions has been found to yield predominantly surface bound dopant ions, which are unstable with respect to solvation in a coordinating solvent (pyridine). The solvation kinetics are biphasic, involving two transient intermediates. In contrast, Co2+ ions are doped much more isotropically in ZnS QDs, and this difference is attributed to the similar ionic radii of Co2+ and Zn2+ ions (0.74 Å), as opposed to Cd2+ ions (0.97 Å). We have developed an isocrystalline core/shell synthetic methodology that enables us to synthesize high quality internally doped Co2+:CdS quantum dots. The effect of Co2+ binding on the surface energies of CdS and ZnS quantum dots is discussed and related to the growth mechanism of diluted magnetic semiconductor quantum dots.

Paper Details

Date Published: 15 November 2002
PDF: 9 pages
Proc. SPIE 4807, Physical Chemistry of Interfaces and Nanomaterials, (15 November 2002); doi: 10.1117/12.452426
Show Author Affiliations
Pavle V. Radovanovic, Univ. of Washington (United States)
Daniel R. Gamelin, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 4807:
Physical Chemistry of Interfaces and Nanomaterials
Jin Z. Zhang; Zhong L. Wang, Editor(s)

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