Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
78 (2001), S. 4022-4024
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Extremely small colloidal InP quantum dots (QDs) with diameters ranging from 15 to 23 Å were synthesized, and the optical properties of close-packed arrays of these dots were studied. The isolated QDs in dilute colloidal solution exhibit pronounced discrete absorption spectra, indicating a narrow size distribution. The absorption spectra of close-packed solids of ∼18 Å diameter QDs with interdot spacings of 9 and 18 Å show that the absorption onsets and excitonic peaks are, respectively, redshifted and broadened in going from dilute solution to close-packed solids. These results can be explained by electron delocalization in disordered close-packed solids; the spacing of electronic levels in the QDs is reduced and produces a redshift in the absorption spectra. © 2001 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1379990
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