title: Absorption cross-section and related optical properties of colloidal InAs quantum dots.
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 x 10(-16)R(3) cm(2) at 2.76 eV and 3.15 x 10(-16)R(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.
authors.affiliation: Center for Basic Sciences, National Renewable Energy Laboratory, Golden, Colorado 80401, USA. pingrong_yu@nrel.gov
authors.forename: Pingrong
authors.initials: P
authors.lastname: Yu
authors.forename: Matthew C
authors.initials: MC
authors.lastname: Beard
authors.forename: Randy J
authors.initials: RJ
authors.lastname: Ellingson
authors.forename: Suzanne
authors.initials: S
authors.lastname: Ferrere
authors.forename: Calvin
authors.initials: C
authors.lastname: Curtis
authors.forename: John
authors.initials: J
authors.lastname: Drexler
authors.forename: Fred
authors.initials: F
authors.lastname: Luiszer
authors.forename: Arthur J
authors.initials: AJ
authors.lastname: Nozik