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5 August 2021 Low temperature trion formation in CdSe nanoplatelets
Albert F. Vong
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Proceedings Volume 11799, Physical Chemistry of Semiconductor Materials and Interfaces XX; 117990X (2021) https://doi.org/10.1117/12.2594876
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States
Abstract
Negative trions are exciton-electron quasiparticles that have applications in optical qubits and other quantum protocols. Colloidal cadmium selenide nanoplatelets are candidate trion materials, since trions dominate their low temperature emission spectra; however, trion formation is not understood. We observe the absence of trion absorption and a finite trion formation lifetime, requiring an alternative explanation for trion generation. Using low-temperature transient absorption (TA) and time-resolved photoluminescence, we propose that trions form through biexciton hole trapping. This contrasts the previously assumed mechanism of charged ground state absorption.
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Albert F. Vong "Low temperature trion formation in CdSe nanoplatelets", Proc. SPIE 11799, Physical Chemistry of Semiconductor Materials and Interfaces XX, 117990X (5 August 2021); https://doi.org/10.1117/12.2594876
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KEYWORDS
Nanolithography
Absorption
Excitons
Quantum efficiency
Picosecond phenomena
Quantum communications
Quantum networks
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