Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.194
Publication date: 7th February 2022
The spectrum of multiexciton emission from colloidal quantum dots at room temperature is important for their use in high-power applications, but an in-depth characterization has not been possible until now. We present and apply a novel spectroscopic method to quantify the biexciton linewidth and biexciton binding energy of single CdSe/CdS/ZnS colloidal QDs. In our method, we select photons emitted by a biexciton emission cascade and reconstruct their spectrum. We find a biexciton linewidth of 86 meV on the single-QD scale, similar to that of the exciton. Variations in the biexciton energy are correlated with but are more narrowly distributed than variations in the exciton energy. Using a simple quantum-mechanical model, we conclude that inhomogeneous broadening in our sample is primarily due to variations in the CdS shell thickness.
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