Charge Transfer in CdSe Nanocrystal Complexes with an Electroactive Polymer

被引：14
|
作者：
Oh, Megan H. J. [1 ,2 ]
Chen, Ming [1 ,2 ,3 ]
Chuang, Chi-Hung [4 ]
Wilson, Gerard J. [3 ]
Burda, Clemens [4 ]
Winnik, Mitchell A. [1 ,2 ]
Scholes, Gregory D. [1 ,2 ]
机构：
[1] Univ Toronto, Inst Opt Sci, Dept Chem, Toronto, ON M5S 3H6, Canada
[2] Univ Toronto, Ctr Quantum Informat & Quantum Control, Toronto, ON M5S 3H6, Canada
[3] CSIRO Mol Sci & Engn, Clayton, Vic 3169, Australia
[4] Case Western Reserve Univ, Dept Chem, Ctr Chem Dynam & Nanomat Res, Cleveland, OH 44106 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 37期
基金：
加拿大自然科学与工程研究理事会;
关键词：
DOT SOLAR-CELLS; QUANTUM DOTS; ELECTRONIC-PROPERTIES; SEMICONDUCTOR NANOCRYSTALS; ABSORPTION-SPECTROSCOPY; FLUORESCENCE-SPECTRA; OPTICAL-PROPERTIES; DIPOLE-MOMENT; STOKES SHIFT; ULTRAFAST;
D O I：
10.1021/jp406196a
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A better understanding of the essential interaction of semiconductor nanocrystals with their adsorbates and surrounding media can be used for controlling and optimizing the energy or charge transfer reactions found in these systems and also for comparing a diverse assortment of photoexcited charge transfer systems found in the latest materials research. In this study, the photoinduced interfacial charge transfer system, a complex of CdSe semiconductor nanocrystals and electroactive polymers containing ruthenium(II)tris(bipyridine), is characterized and then investigated in a comprehensive range of dielectric solvents from toluene to water. The effects of the solvent on the nanocrystal and adsorbate/ligand as well as the charge transfer dynamics of the system are explored through the fluorescence lifetime of the nanocrystal. Through this investigation it was found that fluorescence decays showed the presence of two decay components, which are influenced by solvent dielectric contributions on nanocrystal passivation and surface traps, and charge transfer processes present in the system. The results of the fluorescence decays were put into perspective using Marcus theory, providing some general insight on QD-based charge transfer systems and the effects of solvent polarity.
引用
收藏
页码：18870 / 18884
页数：15
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