Photoexcited silicon nanocrystals: mediators for the excitation of organic molecules

Bernhard Goller, Sergej Polisski, Dmitry Kovalev

Research output: Contribution to journalArticlepeer-review


We report on spin-flip activation of organic molecules from the ground state to one of the excited states having different electronic spin configurations. Based on photoexcitations in silicon (Si) nanocrystals, stored electronic energy can be transferred to other substances. The huge hydrogen passivated surface being accessible for acceptor molecules, the tunable confinement energy of excitons and their very long radiative lifetime allow Si nanocrystals to act efficiently as photosensitizers. We demonstrate that the energy transfer is governed by electron exchange mechanism. Therefore a good overlap of the electron wave functions, of donor and acceptor, is crucial for the efficiency of this type of interaction.
Original languageEnglish
Pages (from-to)1295-1298
Number of pages4
JournalPhysica Status Solidi (A)
Issue number6
Publication statusPublished - Jun 2009
EventInternational Workshop on Nitride Semiconductors - Montreux, Switzerland
Duration: 1 Jun 2009 → …


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