CdSe Quantum Dot-Fullerene Hybrid Nanocomposite for Solar Energy Conversion: Electron Transfer and Photoelectrochemistry

被引:181
作者
Bang, Jin Ho [1 ]
Kamat, Prashant V. [2 ,3 ]
机构
[1] Hanyang Univ, Dept Chem & Appl Chem, Ansan 426791, Kyeonggi Do, South Korea
[2] Univ Notre Dame, Radiat Lab, Notre Dame, IN 46566 USA
[3] Univ Notre Dame, Dept Chem & Biochem, Notre Dame, IN 46566 USA
关键词
solar cell; quantum dots; fullerene; electron transfer; photoelectrochemistry; GOLD NANOPARTICLES; CELLS; NANOCRYSTALS; SIZE; CDTE; PBS; ARRAYS; NANOARCHITECTURES; PORPHYRIN; INJECTION;
D O I
10.1021/nn204350w
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The development of organic/inorganic hybrid nanocomposite systems that enable efficient solar energy conversion has been important for applications in solar cell research. Nanostructured carbon-based systems, in particular C-60, offer attractive strategies to collect and transport electrons generated in a light harvesting assembly. We have assembled CdSe-C-60 nanocomposites by chemically linking CdSe quantum dots (QDs) with thiol-functionalized C-60. The photoinduced charge separation and collection of electrons in CdSe QD-C-60 nanocomposites have been evaluated using transient absorption spectroscopy and photoelectrochemical measurements. The rate constant for electron transfer between excited CdSe QD and C-60 increased with the decreasing size of the CdSe QD (7.9 x 10(9) s(-1) (4.5 nm), 1.7 x 10(10) s(-1) (3.2 nm), and 9.0 x 10(10) s(-1) (2.6 nm)). Slower hole transfer and faster charge recombination and transport events were found to dominate over the forward electron injection process, thus limiting the deliverance of maximum power in CdSe QD-C-60-based solar cells. The photoinduced charge separation between CdSe QDs and C-60 opens up new design strategies for developing light harvesting assemblies.
引用
收藏
页码:9421 / 9427
页数:7
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