title: Size dependence of negative trion Auger recombination in photodoped CdSe nanocrystals.
abstract: We report a systematic investigation of the size dependence of negative trion (T(-)) Auger recombination rates in free-standing colloidal CdSe nanocrystals. Colloidal n-type CdSe nanocrystals of various radii have been prepared photochemically, and their trion decay dynamics have been measured using time-resolved photoluminescence spectroscopy. Trion Auger time constants spanning 3 orders of magnitude are observed, ranging from 57 ps (radius R = 1.4 nm) to 2.2 ns (R = 3.2 nm). The data reveal a substantially stronger size dependence than found for bi- or multiexciton Auger recombination in CdSe or other semiconductor nanocrystals, scaling in proportion to R(4.3).
authors: Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States.
authors: Alicia W
authors: AW
authors: Cohn
authors: Jeffrey D
authors: JD
authors: Rinehart
authors: Alina M
authors: AM
authors: Schimpf
authors: Amanda L
authors: AL
authors: Weaver
authors: Daniel R
authors: DR
authors: Gamelin