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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.
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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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