Excited-state relaxation dynamics of 3-vinylthiophene-terminated silicon quantum dots
Groenewegen V, Kuntermann V, Haarer D, Kunz M, Kryschi C (2010)
Publication Type: Journal article, Original article
Publication year: 2010
Journal
Original Authors: Groenewegen V., Kuntermann V., Haarer D., Kunz M., Kryschi C.
Publisher: American Chemical Society
Book Volume: 114
Pages Range: 11693-11698
Journal Issue: 27
DOI: 10.1021/jp100266w
Abstract
In theory, silicon quantum dots (SiQDs) emit enhanced photoluminescence with a size-tunable spectrum in the visible range. In practice, surface states originating from oxide defect structures or organic ligands are strongly involved in exciton relaxation dynamics because the amplitudes of hole and electron wave functions are nonzero at the SiQD surface. In this study, SiQDs with well-defined surface properties were obtained through a wet-chemistry procedure providing SiQDs with adjustable sizes and oxide-free, 3-vinylthiophene-terminated surfaces. The 3-vinylthiophene-terminated SiQDs have a crystalline spherical 2 nm core and were observed to exhibit blue photoluminescence (∼460 nm) with a quantum yield and lifetime of ca. 23% and 1.3 ns, respectively. The interplay between electronically excited molecular states and conduction band states was examined upon direct monitoring of photoexcited carrier dynamics with femtosecond transient absorption spectroscopy. The 3-vinylthiophene ligands were found to act as surface-bound antennae that mediate ultrafast electron transfer or excitation energy transfer across the SiQD interface. © 2010 American Chemical Society.
Authors with CRIS profile
Vincent Groenewegen
Professur für Physikalische Chemie
Carola Kryschi
Professur für Physikalische Chemie
Additional Organisation(s)
Involved external institutions
Germany (DE)How to cite
APA:
Groenewegen, V., Kuntermann, V., Haarer, D., Kunz, M., & Kryschi, C. (2010). Excited-state relaxation dynamics of 3-vinylthiophene-terminated silicon quantum dots. Journal of Physical Chemistry C, 114(27), 11693-11698. https://dx.doi.org/10.1021/jp100266w
MLA:
Groenewegen, Vincent, et al. "Excited-state relaxation dynamics of 3-vinylthiophene-terminated silicon quantum dots." Journal of Physical Chemistry C 114.27 (2010): 11693-11698.
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