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Ultrafast Charge Separation at the CdSe Quantum Dot/Methylviologen Interface: Dependence on Electron Acceptor Concentration
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Lars Dworak
Veröffentlicht/Copyright:
7. April 2011
Abstract
Photoinduced charge transfer dynamics between CdSe semiconductor quantum dots (QDs) and the molecular acceptor methylviologen (MV2+) were investigated by time resolved absorption spectroscopy. Biexponential behavior of the charge separation is observed and explained by different donor states involved in the electron transfer reaction. Furthermore, we found a linear dependence of the amplitude weighted average electron transfer rate <kET> on the electron acceptor concentration until a methylviologen saturation limit is reached.
Keywords: Ultrafast Spectroscopy; Quantum Dot; Charge Separation; Interface; Concentration Dependence
Published Online: 2011-4-7
Published in Print: 2011-5-1
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Schlagwörter für diesen Artikel
Ultrafast Spectroscopy;
Quantum Dot;
Charge Separation;
Interface;
Concentration Dependence
Artikel in diesem Heft
- Editorial
- Reactions between Cold CHx+ and Slow H and H2
- Reactions in Trifluoropropene and Trifluoropropyne Triggered by Low-Energy (0–12 eV) Electrons: From Single Bond Cleavages to Complex Unimolecular Decompositions
- Direct Access to the Dipole-Forbidden nπ∗T1 State of p-Benzoquinone by Photodetachment Photoelectron Spectroscopy
- Quantitative Study of 4He Real Gas Effects Using Supersonic Beams
- Large Amplitude Motions in Cyclopentene and 1-Butene: Quantum Chemical Insights into the Ground- and Excited State Potential Energy Surfaces
- Coherent Excitation Transfer Driven by Torsional Dynamics: a Model Hamiltonian for PPV Type Systems
- H-Bonding Cooperativity Effects in Amyloids: Quantum Mechanical and Molecular Mechanics Study
- Ultrafast Charge Separation at the CdSe Quantum Dot/Methylviologen Interface: Dependence on Electron Acceptor Concentration
- Circular Dichroism in Ion Yields in Multiphoton Ionization of (R)-Propylene Oxide Employing Femtosecond Laser Pulses
- The Interaction of the Dipeptide Carnosine With Alkali Metal Ions Studied by Ion Trap Mass Spectrometry
- Nonequilibrium NMR Methods for Monitoring Protein and RNA Folding
