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Time\u2010resolved experiments revealed that the electron transfer (ET) from the photoexcited QD to the molecular acceptor methylviologen (MV<jats:sup>2+<\/jats:sup>) occurs on the fs time scale for large acceptor concentrations and that the ET rate is strongly reduced for low concentrations. The increase in the acceptor concentration is accompanied with a growth in the overlap of donor and acceptor wavefunctions, resulting in a faster reaction until the MV<jats:sup>2+<\/jats:sup> concentration reaches a saturation limit of 0.3\u20130.4 MV<jats:sup>2+<\/jats:sup>\u2009nm<jats:sup>\u22122<\/jats:sup>. Moreover, we found significant QD size dependence of the ET reaction, which is explained by a change of the free energy (\u0394<jats:italic>G<\/jats:italic>).<\/jats:p>","DOI":"10.1002\/cphc.201100120","type":"journal-article","created":{"date-parts":[[2011,7,1]],"date-time":"2011-07-01T12:04:39Z","timestamp":1309521879000},"page":"2255-2259","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":36,"title":["Ultrafast Electron Transfer from Photoexcited CdSe Quantum Dots to Methylviologen"],"prefix":"10.1002","volume":"12","author":[{"given":"Frank","family":"Scholz","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lars","family":"Dworak","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Victor 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