title: Exciton relaxation in PbSe nanorods.
abstract: Measurements of the picosecond-time-scale dynamics of photoexcited electrons in PbSe nanorods are reported. The intraband (1Π → 1Σ) relaxation occurs with a time constant of ~500 fs, which corresponds to a fast energy-relaxation rate of ~0.6 eV/ps. The biexciton lifetime in PbSe nanorods is significantly (3-4 times) longer than the lifetime of PbSe quantum dots with the same energy gap, roughly as expected considering the increased volume. The multiexciton lifetimes of PbSe nanorods scale as expected for a bimolecular recombination mechanism. Implications of the observed relaxations will be discussed.
authors.affiliation: School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14850, United States.
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.forename: Byung-Ryool
authors.initials: BR
authors.lastname: Hyun
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Basile
authors.forename: Frank W
authors.initials: FW
authors.lastname: Wise
mesh_terms: D004579:Electron Transport; D007854:Lead / Q000737:chemistry*; D008027:Light; D008422:Materials Testing; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012542:Scattering, Radiation; D018036:Selenium Compounds / Q000737:chemistry*
chemical_list: D018036:Selenium Compounds; C088065:lead selenide; D007854:Lead