Ultrafast intraband relaxation in colloidal quantum dots

J. J. H. Pijpers; E. Hendry; M. Bonn

doi:10.1117/12.761665

14 February 2008 Ultrafast intraband relaxation in colloidal quantum dots

J. J. H. Pijpers, E. Hendry, M. Bonn

Proceedings Volume 6892, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII; 68921H (2008) https://doi.org/10.1117/12.761665
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

Abstract

We independently determine the subpicosecond cooling rates for holes and electrons in CdSe quantum dots using time-resolved luminescence and time-resolved TeraHertz spectroscopy. The rate of hole cooling, following photoexcitation of the quantum dots, depends critically on the electron excess energy. This constitutes a direct proof of electron-to-hole energy transfer, the hypothesis behind the Auger cooling mechanism proposed in quantum dots, which is found to occur on a 1 ± 0.15 ps time scale. This is only marginally slower than the timescale of intraband relaxation of electrons in single crystal CdSe. In bulk CdSe, sequential multi-phonon emission allows for cooling rates of (0.4 ps)^-1 at room temperature.

Citation Download Citation

J. J. H. Pijpers, E. Hendry, and M. Bonn "Ultrafast intraband relaxation in colloidal quantum dots", Proc. SPIE 6892, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII, 68921H (14 February 2008); https://doi.org/10.1117/12.761665

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