Multiple Exciton Generation and Dynamics in InP/CdS Colloidal Quantum Dots
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- 作者：Charles T. SmithMarina A. Leontiadou ; Pip C. J. Clark ; Claire Lydon ; Nicky Savjani ; Ben F. Spencer ; Wendy R. Flavell ; Paul O’Brien ; David J. Binks
- 刊名：Journal of Physical Chemistry C
- 出版年：2017
- 出版时间：February 2, 2017
- 年：2017
- 卷：121
- 期：4
- 页码：2099-2107
- 全文大小：521K
- ISSN：1932-7455
文摘
We report measurements of multiple exciton generation and recombination in InP/CdS (core/shell) colloidal quantum dots. Ultrafast transient absorption spectroscopy was used to measure the subnanosecond charge dynamics for a range of pump fluences and for different pump photon energies. Analysis of the resulting transients was used to determine the quantum yield of multiple exciton generation, which was found to be 1.22 ± 0.01 for a pump photon energy equivalent to three times the band gap.