Optical, Electronic, and Structural Properties of Uncoupled and Close-Packed Arrays of InP Quantum Dots

Olga I. Mićić, Kim M. Jones, Andrew Cahill, Arthur J. Nozik

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223 Scopus Citations

Abstract

Solid films consisting of close-packed arrays of InP quantum dots have been prepared by slowly evaporating colloidal solutions of InP quantum dots. The diameters of the quantum dots were controlled to be between about 30 to 60 Å; size-selective precipitation yielded a size distribution of about 10% about the mean diameter. The arrays show regions of hexagonal order, as well as disordered regions. Oxide layers can form irreversibly on the quantum dot surface and limit the effectiveness of the size-selective precipitation. Photoluminescence spectra obtained from close-packed films of InP quantum dots formed from quantum dots with a single mean diameter and from a mixture of two quantum dot sizes show that energy transfer occurs from the photoexcited smaller quantum dots to the larger quantum dots. The efficiency of this energy transfer process is high.

Original languageAmerican English
Pages (from-to)9791-9796
Number of pages6
JournalJournal of Physical Chemistry B
Volume102
Issue number49
DOIs
StatePublished - 1998

NREL Publication Number

  • NREL/JA-590-24674

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