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Mechanisms for intraband energy relaxation in semiconductor quantum dots: The role of electron-hole interactions
Abstract
To evaluate the role of nonphonon energy relaxation mechanisms in quantum dots and in particular the role of electron-hole (e-h) interactions, we have studied femtosecond carrier dynamics in CdSe colloidal nanoparticles in which the e-h separation (coupling) is controlled using different types of surface ligands. In dots capped with hole accepting molecules, the e-h coupling is strongly reduced after the hole is transferred to a capping group. By re-exciting an electron within the conduction band at different stages of hole transfer and monitoring its relaxation back into the ground state, we observe a more than tenfold increase in the electron relaxation time (from 250 fs to 3 ps) after the completion of the hole transfer to the capping molecule. This strongly indicates that electron relaxation in quantum dots is dominated not by phonon emission but by the e-h energy transfer.
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Cited by
Chemistry and Properties of Nanocrystals of Different Shapes
Burda, C., Chen, X., Narayanan, R., & El-Sayed, M. A. (2005) · Chemical Reviews · doi:10.1021/cr030063a · Cited by 7,230
Kambhampati, P. (2011) · The Journal of Physical Chemistry C · doi:10.1021/jp2058673 · Cited by 391
Metadata
- Authors
- Klimov, V. I., Mikhailovsky, A. A., McBranch, D. W., Leatherdale, C. A., & Bawendi, M. G.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2000-05-15
- Volume
- 61
- Issue
- 20
- Pages
- R13349-R13352
- ISSN
- 0163-1829 (ISSN-L)
- 1095-3795
- OpenAlex
- W2066091879
- Cited by
- 270
- References
- 0
- FWCI
- 9.63
- Type
- journal article
- Language
- en
- Open access
- closed
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- Klimov, V. I., Mikhailovsky, A. A., McBranch, D. W., Leatherdale, C. A., & Bawendi, M. G. (2000). Mechanisms for intraband energy relaxation in semiconductor quantum dots: The role of electron-hole interactions. Physical Review B. https://doi.org/10.1103/physrevb.61.r13349
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