Ultrafast Charge Separation at CdS Quantum Dot/Rhodamine B Molecule Interface

J. Am. Chem. Soc., 129 (49), 15132 -15133, 2007. 10.1021/ja0773406 S0002-7863(07)07340-4
Web Release Date: November 15, 2007

Ultrafast Charge Separation at CdS Quantum Dot/Rhodamine B Molecule Interface

Abdelaziz Boulesbaa, Abey Issac, Dave Stockwell, Zhuangqun Huang, Jier Huang, Jianchang Guo, and Tianquan Lian*

Department of Chemistry, Emory University, Atlanta, Georgia 30322tlian@emory.edu

Received September 21, 2007; E-mail: tlian@emory.edu

Abstract:

Ultrafast dissociation of excitons in CdS quantum dots via electron transfer to adsorbed rhodamine B (RhB) molecules was demonstrated. The rate of electron transfer can be controlled by the number of adsorbates attached on the nanoparticle and transfer time as fast as 12 picoseconds was observed. The rapid and controllable charge separation in this model quantum dot-adsorbate complex provides a potential approach for separating multiple excitons before the exciton-exciton annihilation process.

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