Excited-state relaxation dynamics of 3-vinylthiophene-terminated silicon quantum dots

Journal article
(Original article)


Publication Details

Author(s): Groenewegen V, Kuntermann V, Haarer D, Kunz M, Kryschi C
Journal: Journal of Physical Chemistry C
Publisher: American Chemical Society
Publication year: 2010
Volume: 114
Journal issue: 27
Pages range: 11693-11698
ISSN: 1932-7447
eISSN: 1932-7455


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.



FAU Authors / FAU Editors

Groenewegen, Vincent
Professur für Physikalische Chemie
Kryschi, Carola Prof. Dr.
Professur für Physikalische Chemie


Additional Organisation
Lehrstuhl für Elektrische Energiesysteme


External institutions with authors

Universität Bayreuth


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.

BibTeX: 

Last updated on 2019-06-08 at 09:05