Projects per year
Abstract
The light emission properties of silicon crystalline nanoparticles (SiNPs) have been investigated using steady-state and time-resolved photoluminescence measurements carried out at 12 K and at room temperature. To enable a comparative study of the role of surface terminal groups on the optical properties, we investigated SiNPs-H ensembles with the same mean NP diameter but differing on the surface termination, namely organic-functionalized with 1-dodecene (SiNPs-C12) and H-terminated (SiNPs-H). We show that although the spectral dependence of the light emission is rather unaffected by surface termination, characterized by a single broad band peaking at ∼1.64 eV, both the exciton recombination lifetimes and quantum yields display a pronounced dependence on the surface termination. Exciton lifetimes and quantum yields are found to be significantly lower in SiNPs-H compared SiNPs-C12. This difference is due to distinct non-radiative recombination probabilities resulting from inter-NP exciton migration, which in SiNPs-C12 is inhibited by the energy barriers imposed by the bulky surface groups. The surface groups of organic-terminated SiPs are responsible for the inhibition of inter-NP exciton transfer, yielding a higher quantum yield compared to SiNPs-H. The surface oxidation of SiNPs-C12 leads to the appearance of a phenomenon of an exciton transference from to the Si core to oxide-related states that contribute to light emission. These excitons recombine radiatively, explaining why the emission quantum of the organic-terminated SiNPs is the same after surface oxidation of SiNPs-C12.
Original language | English (US) |
---|---|
Article number | 325703 |
Journal | Nanotechnology |
Volume | 27 |
Issue number | 32 |
DOIs | |
State | Published - Jun 27 2016 |
Bibliographical note
Publisher Copyright:© 2016 IOP Publishing Ltd.
Keywords
- core-shell silicon nanoparticles
- energy transfer
- exciton migration
- nonthermal plasma reactor
- photoluminescence
- quantum yield
How much support was provided by MRSEC?
- Partial
Reporting period for MRSEC
- Period 3
PubMed: MeSH publication types
- Journal Article
Fingerprint
Dive into the research topics of 'Influence of the surface termination on the light emission of crystalline silicon nanoparticles'. Together they form a unique fingerprint.-
MRSEC IRG-2: Sustainable Nanocrystal Materials
Kortshagen, U. R., Aydil, E. S., Campbell, S. A., Francis, L. F., Haynes, C. L., Hogan, C., Mkhoyan, A., Shklovskii, B. I. & Wang, X.
9/1/98 → …
Project: Research project
-
-