Abstract
The dynamics and spectroscopy of silicon nanocrystals that emit at visible wavelengths were analyzed. Size-selective precipitation and size-exclusion chromatography cleanly separate the silicon nanocrystals from larger crystallites and aggregates and provide direct evidence for quantum confinement in luminescence. Measured quantum yields are as high as 50 percent at low temperature, principally as a result of efficient oxide passivation. Despite a 0.9—electron-volt shift of the band gap to higher energy, the nanocrystals behave fundamentally as indirect gap materials with low oscillator strength.
Keywords
NanocrystalQuantum dotPassivationMaterials scienceSiliconPotential wellBand gapOptoelectronicsNanotechnologyPrecipitationSpectroscopyPhotoluminescencePhysics
Affiliated Institutions
Related Publications
Thiol-Capping of CdTe Nanocrystals: An Alternative to Organometallic Synthetic Routes
New approaches to synthesize photostable thiol-capped CdTe nanocrystals are reported. Post-preparative size-selective precipitation and selective photochemical etching have been...
The Electronic Structure of Semiconductor Nanocrystals
▪ Abstract We review the rapid progress made in our understanding of the crystal properties of semiconductors and nanocrystals focussing on theoretical results obtained within t...
A Novel Organometallic Synthesis of Highly Luminescent CdTe Nanocrystals
Highly luminescent CdTe nanocrystals were synthesized by reacting dimethylcadmium with different tellurium sources in mixtures of dodecylamine and trioctylphosphine as the coord...
Silicon quantum wire array fabrication by electrochemical and chemical dissolution of wafers
Indirect evidence is presented that free-standing Si quantum wires can be fabricated without the use of epitaxial deposition or lithography. The novel approach uses electrochemi...
Publication Info
- Year
- 1993
- Type
- article
- Volume
- 262
- Issue
- 5137
- Pages
- 1242-1244
- Citations
- 764
- Access
- Closed
External Links
Social Impact
Altmetric
PlumX Metrics
Social media, news, blog, policy document mentions
Citation Metrics
764
OpenAlex
Cite This
William L. Wilson,
Paul F. Szajowski,
Louis E. Brus
(1993).
Quantum Confinement in Size-Selected, Surface-Oxidized Silicon Nanocrystals.
Science
, 262
(5137)
, 1242-1244.
https://doi.org/10.1126/science.262.5137.1242
Identifiers
- DOI
- 10.1126/science.262.5137.1242