Femtosecond studies of interfacial electron‐hole recombination in aqueous CdS colloids
Femtosecond studies of interfacial electron‐hole recombination in aqueous CdS colloids
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DOI：
10.1063/1.111986
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发表时间：
1994-04
影响因子：
4
通讯作者：
J. Zhang;R. O’Neil;T. Roberti
中科院分区：
文献类型：
--
作者：
J. Zhang;R. O’Neil;T. Roberti
我们报道了在飞秒时间尺度上测量CdS胶体水溶液中的电子-空穴复合率。已经观察到快速的2-ps衰减和较慢的45-ps衰减，并且发现衰减动力学对激发激光强度非常敏感。在低激发强度下，导致45-ps衰变的双生电子-空穴复合在衰变过程中占主导地位，而在高激发强度下，导致2-ps衰变的非双生电子-空穴复合变得更加重要。
We report the measurements of the electron‐hole recombination rate in aqueous CdS colloids on the femtosecond time scale. A fast 2‐ps decay and a slower 45‐ps decay have been observed, and the decay dynamics are found to be very sensitive to the excitation laser intensity. Geminate electron‐hole recombination, responsible for the 45‐ps decay, dominates the decay process at low excitation intensities, while nongeminate recombination, accounting for the 2‐ps decay, becomes more important at high excitation intensities.