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Probing Trions at Chemically Tailored Trapping Defects.

Hyejin Kwon¹, Mijin Kim¹, Manuel Nutz²

¹Department of Chemistry and Biochemistry, University of Maryland, 8051 Regents Drive, College Park, Maryland 20742, United States.

ACS Central Science

|December 7, 2019

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Chemically engineering quantum defects in carbon nanotubes enables efficient generation and localization of trions (charged excitons). This breakthrough enhances trion brightness and stability, opening new avenues for optoelectronic applications.

Area of Science:

Materials Science
Quantum Physics
Nanotechnology

Background:

Trions, charged excitons, are crucial for applications like energy harvesting and quantum computing.
Their low abundance at room temperature hinders experimental study and application.

Purpose of the Study:

To develop a method for efficient trion generation and localization.
To investigate the photophysics of engineered trions in semiconducting carbon nanotubes.

Main Methods:

Chemical engineering of sp3 quantum defect well depths using alkyl functional groups on carbon nanotubes.
Magnetoluminescence spectroscopy to analyze trion properties.
Photoluminescence lifetime measurements.

Main Results:

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Efficient generation and localization of trions at engineered trapping defects.
Achieved exciton-electron binding energy of 119 meV, more than double that of free trions.
Observed a 7.3-fold increase in trion brightness and a >100-fold increase in photoluminescence lifetime compared to free trions.
Demonstrated efficient conversion of dark excitons to bright trions at defect sites.

Conclusions:

Chemical engineering of quantum defects provides synthetic accessibility to trions.
Enhanced trion properties (binding energy, brightness, lifetime) are achieved.
Potential for broad applications in bioimaging, sensing, energy harvesting, and short-wave infrared light emission.