Exciton-Phonon Coupling in Single Band-Gap Engineered ZnCdSe-Dot/CdS-Rod Nanocrystals
arxiv(2024)
摘要
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 Zn_1-xCd_xSe/CdS dot-in-rod nanocrystals at cryogenic
temperatures (T≈ 10 K). 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.
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