Luminescent Colloidal Silicon Nanocrystals Prepared by Nanoseconds Laser Fragmentation and Laser Ablation in Water

V Svrcek, D Mariotti, R Hailstone, H Fujiwara, M Kondo

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)
    6 Downloads (Pure)

    Abstract

    The surface states of silicon nanocrystals (Si-ncs) considerably affect quantum confinement effects and may determinate final nanocrystals properties. Colloidally dispersed Sincs offer larger freedom for surface modification compared to common plasma enhanced chemical vapor deposition or epitaxial synthesis in a solid matrix. The Si-ncs fabrication and elaboration in water by pulsed laser processing is an attractive alternative for controlling and engineering of nanocrystal surface by environmentally compatible way. We report on the possibility of direct silicon surface ablation and Si-ncs fabrication by nanosecond pulsed laser fragmentation of electrochemically etched Si micrograins and by laser ablation of crystalline silicon target immersed in de-ionized water. Two nanosecond pulsed lasers (Nd:YAG, and excimer KrF) are successfully employed to assure fragmentation and ablation in order to produce silicon nanoparticles. Contrary to the fragmentation process, which is more efficient under Nd:YAG irradiation, the laser ablation by both lasers led to the fabrication of fine and room temperature hotoluminescent Si-ncs. The processing that has natural compatibility with the environment and advanced state of fabrication technologies may imply new possibilities and applications.
    Original languageEnglish
    Title of host publicationUnknown Host Publication
    Pages437-442
    Number of pages6
    Publication statusPublished - 28 Mar 2008
    EventAMORPHOUS AND POLYCRYSTALLINE THIN-FILM SILICON SCIENCE AND TECHNOLOGY-2008 -
    Duration: 28 Mar 2008 → …

    Publication series

    NameMATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS

    Conference

    ConferenceAMORPHOUS AND POLYCRYSTALLINE THIN-FILM SILICON SCIENCE AND TECHNOLOGY-2008
    Period28/03/08 → …

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    Cite this

    Svrcek, V., Mariotti, D., Hailstone, R., Fujiwara, H., & Kondo, M. (2008). Luminescent Colloidal Silicon Nanocrystals Prepared by Nanoseconds Laser Fragmentation and Laser Ablation in Water. In Unknown Host Publication (pp. 437-442). (MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS).