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Demystifying Trion Emission in CdSe Nanoplatelets
Maurizio Riesner1, Farzan Shabani2, Levin Zeylmans van Emmichoven1
1Werkstoffe der Elektrotechnik and CENIDE, University of Duisburg-Essen, Duisburg 47057, Germany.
ACS Nano
|August 19, 2024
Summary
Förster resonant energy transfer in stacked cadmium selenide nanoplatelets (NPLs) and hole traps trigger trion formation. Copper doping enhances trion emission in NPLs, controlling exciton ratios.
Area of Science:
- Materials Science
- Quantum Dots
- Nanotechnology
Background:
- The photoluminescence spectrum of cadmium selenide nanoplatelets (NPLs) at cryogenic temperatures exhibits multiple emission lines.
- The origin of these emission lines, particularly the prominent role of trions, remains under debate.
Purpose of the Study:
- To investigate the mechanisms behind trion formation in CdSe NPLs.
- To understand the influence of NPL stacking and doping on photoluminescence spectra.
Main Methods:
- Fabrication of CdSe NPL stacks.
- Photoluminescence spectroscopy at cryogenic temperatures.
- Introduction of copper (Cu+) dopants as intentional hole traps.
Main Results:
- Förster resonant energy transfer in NPL stacks combined with hole traps induces trion formation.
- Single NPL spectra are dominated by neutral excitonic emission.
- Copper doping strongly enhances trion emission, even in single NPLs, by providing abundant hole traps.
Conclusions:
- Trion formation in CdSe NPLs is triggered by energy transfer and hole trapping.
- The ratio of trion to neutral exciton emission can be controlled via NPL stacking or copper doping.
