Photoinduced Electron Transfer in CdSe/ZnS Quantum Dot-Fullerene Hybrids

Kirsi Virkki, Sinem Demir, Helge Lemmetyinen, Nikolai V. Tkachenko

    Research output: Contribution to journalArticleScientificpeer-review

    34 Citations (Scopus)


    Photoinduced electron transfer (ET) in CdSe/ZnS core-shell quantum dot (QD) - fullerene (COOH-C<inf>60</inf>) hybrids was studied by the means of time-resolved emission and absorption spectroscopy techniques. A series of four QDs with emission in the range 540-630 nm was employed to investigate the dependence of the electron transfer rate on the QD size. Emission of the QDs is quenched upon hybrid formation, and the quenching mechanism is identified as photoinduced electron transfer from the QD to the fullerene moiety due to the fullerene anion signature observed in transient absorption. In order to obtain quantitative information on the ET reaction, several kinetic data analysis techniques were used, including a conventional multiexponential fitting and a maximum entropy method for emission decay analysis, as well as a distributed decay model based on the Poisson distribution of fullerenes in the hybrids. The latter gradually simplifies the interpretation of the transient absorption spectra and indicates that the spectra of QD cations are essentially similar to those of neutral QDs, differing only by a minor decrease in the intensity and broadening. Furthermore, only a minor decrease in the ET rate with the increasing QD size was observed, the time constants being in the range 100-200 ps for all studied QDs. The charge recombination is extended to 10 ns or longer for all hybrids.

    Original languageEnglish
    Pages (from-to)17561-17572
    Number of pages12
    JournalJournal of Physical Chemistry C
    Issue number31
    Publication statusPublished - 23 Jul 2015
    Publication typeA1 Journal article-refereed

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Electronic, Optical and Magnetic Materials
    • Surfaces, Coatings and Films
    • Energy(all)


    Dive into the research topics of 'Photoinduced Electron Transfer in CdSe/ZnS Quantum Dot-Fullerene Hybrids'. Together they form a unique fingerprint.

    Cite this