2024/04/17 by Florian Johst, Johst, Florian, Jannik Rebmann +17
Engineering · Materials Science · #Advanced Semiconductor Detectors and Materials #Chalcogenide Semiconductor Thin Films #Chemical Physics (physics.chem-ph) #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Dots Synthesis And Properties
paper · pdf · doi:10.48550/arxiv.2404.11516
openalex publication_date 2024/04/17 · openalex created_date 2024/04/19 · openalex updated_date 2026/07/30
Exciton-phonon coupling limits the homogeneous emission linewidth of nanocrystals. Hence, a full understanding of it is crucial. In this work, we statistically investigate exciton-phonon coupling by performing single-particle spectroscopy on Zn1-xCdxSe/CdS dot-in-rod nanocrystals at cryogenic temperatures (T≈ 10~\rmK). In situ cation exchange enables us to analyze different band alignments and thereby different charge-carrier distributions. We find that the relative intensities of the longitudinal optical S- and Se-type phonon replicas correlate with the charge-carrier distribution. Our experimental findings are complemented with quantum mechanical calculations within the effective mass approximation that hint at the relevance of surface charges.