Journal
RSC ADVANCES
Volume 5, Issue 113, Pages 92923-92931Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra19114a
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Funding
- Mexican Council for Science and Technology (CONACyT-Mexico) [212453]
- project PAPIIT [UNAM IG100614-2]
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In this paper we show that it is possible to carry out a functional coupling between a thin film of silicon quantum dots embedded in a silicon nitride matrix (SiQDs) and a monolayer of gold nanoparticles by using dry and low temperature techniques, such as those used in microelectronics industry, i.e., Remote Plasma Enhanced Chemical Vapor Deposition (RPECVD) and Sputtering. The coupled structure showed 105% of photoluminescence (PL) enhancement, compared with PL observed from the SiQDs without the gold monolayer. The SiQDs used as light emitters have an average diameter of 3.1 nm, a particle density of 6.04 +/- 10(12) particles per cm(2) and a maximum PL peak at 505 +/- 5 nm. Additionally, the gold nanoparticles were designed with the following characteristics: the particles are embedded in a silicon nitride matrix, show quasi-spherical shapes, an average diameter of 2.9 nm, a particle density of 2.52 x 10(12) particles per cm(2) and their surface plasmon resonance is located at 540 +/- 3 nm. We found that there is an optimum separation distance between SiQDs and the gold monolayer to achieve the maximum photoluminescence enhancement. For our structure, such optimal distance was 10 +/- 1 nm. We consider that there could be two combined physical effects responsible of the enhancement: (a) a plasmonic diffraction-limited coupling and (b) a change of the scattering mechanisms of the primary laser light.
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