Absorption Cross-Section and Related Optical Properties of Colloidal InAs Quantum Dots

Pingrong Yu, Matthew C. Beard, Randy J. Ellingson, Suzanne Fernere, Calvin Curtis, John Drexler, Fred Luiszer, Arthur J. Nozik

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142 Scopus Citations

Abstract

We report the absorption cross-section of colloidal InAs quantum dots of mean radii from 1.6 to 3.45 nm. We find excellent agreement between the measured results and calculated values based on a model of small-particle light absorption. The absorption cross-section per dot is 6.2 × 10 -16R 3 cm 2 at 2.76 eV and 3.15 × 10 -16R 1.28 cm 2 at the first-exciton absorption peak, with the dot radius R in nm. We find that the per-quantum-dot particle oscillator strength of the first-exciton transition is constant for all sizes studied. The radiative lifetime of the first exciton calculated from the oscillator strength increases with dot size and ranges from 4 ns for the smallest dots to 14 ns for the largest ones.

Original languageAmerican English
Pages (from-to)7084-7087
Number of pages4
JournalJournal of Physical Chemistry B
Volume109
Issue number15
DOIs
StatePublished - 2005

NREL Publication Number

  • NREL/JA-590-38431

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