Journal
ACS NANO
Volume 8, Issue 5, Pages 4239-4247Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn500894p
Keywords
carbon nanomaterials; photophysics; defects; chemical functionalization; exciton; spectroscopy
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Funding
- University of Maryland
- Office of Naval Research [N000141110465]
- National Science Foundation [CAREER CHE-1055514]
- American Recovery and Reinvestment Act of 2009 [DE-AC05-06OR23100]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1055514] Funding Source: National Science Foundation
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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.
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