Colloidal suspensions of silicon nanocrystals: from single nanocrystals to photonic structures
2005 (English)In: Optical materials (Amsterdam), ISSN 0925-3467, Vol. 27, no 5, 1046-1049 p.Article in journal (Refereed) Published
Colloidal suspesions of Si nanocrystals (NCs) are prepared from light-emitting porous Si grains obtained by mechanical pulverization of electrochemically etched layers. Sedimented and/or filtered Si NCs sols reveal a green photoluminescence (PL) band around 530nm, which is interpreted as radiative recombination of electron-hole pairs inside Si NCs with diameter about 2nm. These colloidal solutions have multiple advantages for both fundamental investigations and for nanotechnology. In one extreme, single molecule spectroscopy techniques can be applied to investigate PL of single grains of Si NCs dispersed on substrates from highly diluted solutions. On the other hand, concentrated suspensions enable us to fabricate bulk samples with embedded Si NCs or to prepare self-organised nanostructures on surfaces.
Place, publisher, year, edition, pages
2005. Vol. 27, no 5, 1046-1049 p.
porous silicon, blue luminescence, quantum dots, excitation, sio2
IdentifiersURN: urn:nbn:se:kth:diva-14600DOI: 10.1016/j.optmat.2004.08.060ISI: 000227621300062ScopusID: 2-s2.0-13444280320OAI: oai:DiVA.org:kth-14600DiVA: diva2:332641
QC 20100525 QC 20111012. Symposium of the European-Materials-Research-Society on Si-Based Photonics - Towards True Monolithic Integration. Strasbourg, FRANCE. MAY 25-28, 2004 2010-08-052010-08-052011-10-12Bibliographically approved