Ultrafast Charge Separation at the CdSe/CdS Core/Shell Quantum Dot/Methylviologen Interface: Implications for Nanocrystal Solar Cells

被引：87

作者：

Dworak, Lars ^{[1
]}

Matylitsky, Victor V. ^{[1
]}

Breus, Vladimir V. ^{[2
]}

Braun, Markus ^{[1
]}

Basche, Thomas ^{[2
]}

Wachtveitl, Josef ^{[1
]}

机构：

[1] Goethe Univ Frankfurt, Inst Phys & Theoret Chem, D-60438 Frankfurt, Germany

[2] Johannes Gutenberg Univ Mainz, Inst Phys Chem, D-55099 Mainz, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 10期

关键词：

LIGHT-EMITTING-DIODES; ELECTRON-TRANSFER; SEMICONDUCTOR NANOCRYSTALS; OPTICAL GAIN; DISTANCE DEPENDENCE; CARRIER DYNAMICS; DOTS; NANOPARTICLES; PHOTOISOMERIZATION; RECOMBINATION;

D O I：

10.1021/jp111574w

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：

Exciton separation dynamics in the electron transfer system containing highly photostable CdSe/CdS core/shell nanocrystal quantum dots and adsorbed methylviologen was investigated by means of femtosecond absorption spectroscopy. The experiments revealed that electron extraction from the photoexcited core is possible, and the rate of the ET reaction strongly depends on the CdS shell thickness. A CdS associated exponential decay constant beta of 0.33 angstrom(-1) was obtained reflecting the electronic barrier effect of the shell. These findings show, that core/shell structures are Well suited for the design of optimized QD-based solar cells.

引用

页码：3949 / 3955

页数：7

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