Direct Observation of Electron-to-Hole Energy Transfer in CdSe Quantum Dots
Copyright policy )Direct Observation of Electron-to-Hole Energy Transfer in CdSe Quantum Dots
We independently determine the subpicosecond cooling rates for holes and electrons in CdSe quantum dots. Time-resolved luminescence and terahertz spectroscopy reveal that the rate of hole cooling, following photoexcitation of the quantum dots, depends critically on the electron excess energy. This constitutes the first direct, quantitative measurement 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.
- University of Amsterdam Netherlands
- Dutch Research Council Netherlands
- Columbia University United States
- Utrecht University Netherlands
- King’s University United States
cadmium compounds, wide band gap semiconductors, electron-hole recombination, time resolved spectra, II-VI semiconductors, photoluminescence, 530, semiconductor quantum dots
cadmium compounds, wide band gap semiconductors, electron-hole recombination, time resolved spectra, II-VI semiconductors, photoluminescence, 530, semiconductor quantum dots
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