Synthesis of Extremely Small InP Quantum Dots and Electronic Coupling in Their Disordered Solid Films

Olga I. Mićić, S. P. Ahrenkiel, Arthur J. Nozik

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211 Scopus Citations

Abstract

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.

Original languageAmerican English
Pages (from-to)4022-4024
Number of pages3
JournalApplied Physics Letters
Volume78
Issue number25
DOIs
StatePublished - 2001

NREL Publication Number

  • NREL/JA-590-29896

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