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

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Groenewegen V, Kuntermann V, Haarer D, Kunz M, Kryschi C
Zeitschrift: Journal of Physical Chemistry C
Verlag: American Chemical Society
Jahr der Veröffentlichung: 2010
Band: 114
Heftnummer: 27
Seitenbereich: 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-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

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


Zusätzliche Organisationseinheit(en)
Lehrstuhl für Elektrische Energiesysteme


Einrichtungen weiterer Autorinnen und Autoren

Universität Bayreuth


Zitierweisen

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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Zuletzt aktualisiert 2019-06-08 um 09:05