Exciton-Phonon Coupling in Single Band-Gap Engineered ZnCdSe-Dot/CdS-Rod Nanocrystals
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910413899169792 |
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| author | Johst, Florian Rebmann, Jannik Werners, Hans Klemeyer, Lars Kesavan, Jagadesh Kopula Koziej, Dorota Strelow, Christian Bester, Gabriel Mews, Alf Kipp, Tobias |
| author_facet | Johst, Florian Rebmann, Jannik Werners, Hans Klemeyer, Lars Kesavan, Jagadesh Kopula Koziej, Dorota Strelow, Christian Bester, Gabriel Mews, Alf Kipp, Tobias |
| contents | 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$_{1-x}$Cd$_{x}$Se/CdS dot-in-rod nanocrystals at cryogenic temperatures ($T\approx 10~\rm{K}$). 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_11516 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Exciton-Phonon Coupling in Single Band-Gap Engineered ZnCdSe-Dot/CdS-Rod Nanocrystals Johst, Florian Rebmann, Jannik Werners, Hans Klemeyer, Lars Kesavan, Jagadesh Kopula Koziej, Dorota Strelow, Christian Bester, Gabriel Mews, Alf Kipp, Tobias Mesoscale and Nanoscale Physics Materials Science Chemical Physics 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$_{1-x}$Cd$_{x}$Se/CdS dot-in-rod nanocrystals at cryogenic temperatures ($T\approx 10~\rm{K}$). 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. |
| title | Exciton-Phonon Coupling in Single Band-Gap Engineered ZnCdSe-Dot/CdS-Rod Nanocrystals |
| topic | Mesoscale and Nanoscale Physics Materials Science Chemical Physics |
| url | https://arxiv.org/abs/2404.11516 |