title: Controlled defects in semiconducting carbon nanotubes promote efficient generation and luminescence of trions.
abstract: We demonstrate efficient creation of defect-bound trions through chemical doping of controlled sp(3) defect sites in semiconducting, single-walled carbon nanotubes. These tricarrier quasi-particles luminesce almost as brightly as their parent excitons, indicating a remarkably efficient conversion of excitons into trions. Substantial populations of trions can be generated at low excitation intensities, even months after a sample has been prepared. Photoluminescence spectroscopy reveals a trion binding energy as high as 262 meV, which is substantially larger than any previously reported values. This discovery may have important ramifications not only for studying the basic physics of trions but also for the application of these species in fields such as photonics, electronics, and bioimaging.
authors.affiliation: Department of Chemistry and Biochemistry, ‡Institute for Physical Science and Technology, §Maryland NanoCenter, and ∥Center for Nanophysics and Applied Materials, University of Maryland , College Park, Maryland 20742, United States.
authors.forename: Alexandra H
authors.initials: AH
authors.lastname: Brozena
authors.forename: Jarrett D
authors.initials: JD
authors.lastname: Leeds
authors.forename: Yin
authors.initials: Y
authors.lastname: Zhang
authors.forename: John T
authors.initials: JT
authors.lastname: Fourkas
authors.forename: YuHuang
authors.initials: Y
authors.lastname: Wang
mesh_terms: D002244:Carbon / Q000737:chemistry; D003952:Diagnostic Imaging; D004581:Electronics; D004583:Electrons; D008027:Light; D049449:Luminescence; D008163:Luminescent Measurements; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D017785:Photons; D011789:Quantum Theory; D012666:Semiconductors; D013053:Spectrophotometry
chemical_list: D037742:Nanotubes, Carbon; D002244:Carbon