The shell matters: one step synthesis of core-shell silicon nanoparticles with room temperature ultranarrow emission linewidth

Fucikova, AnnaCharles Univ Prague, Fac Math & Phys, Dept Chem Phys & Opt, Ke Karlovu 3, Prague 12116 2, Czech Republic. (author)

The shell matters : one step synthesis of core-shell silicon nanoparticles with room temperature ultranarrow emission linewidth

QC 20200915
Here we present a one-step synthesis that provides silicon nanocrystals with a thin shell composed of a ceramic-like carbonyl based compound, embedded in a porous organosilicon film. The silicon nanocrystals were synthesised from hydrogen silsesquioxane molecules, modified with organic molecules containing carbonyl groups, which were annealed at 1000 degrees C in a slightly reducing 5% H-2 : 95% Ar atmosphere. The organic character of the shell was preserved after annealing due to trapping of organic molecules inside the HSQ-derived oxide matrix that forms during the annealing. The individual silicon nanocrystals, studied by single dot spectroscopy, exhibited a significantly narrower emission peak at room temperature (lowest linewidth similar to 17 meV) compared to silicon nanocrystals embedded in a silicon oxide shell (150 meV). Their emission linewidths are even significantly narrower than those of single CdSe quantum dots (>50 meV). It is hypothesized that the Si-core-thin shell structure of the nanoparticle is responsible for the unique optical properties. Its formation within one synthesis step opens new opportunities for silicon-based quantum dots. The luminescence from the produced nanocrystals covers a broad spectral range from 530-720 nm (1.7-2.3 eV) suggesting strong application potential for solar cells and LEDs, following the development of a suitable mass-fabrication protocol.

Sychugov, IlyaKTH,Fotonik(Swepub:kth)u1cgceze (author)
Linnros, Jan,1953-KTH,Fotonik(Swepub:kth)u1t79mee (author)
Charles Univ Prague, Fac Math & Phys, Dept Chem Phys & Opt, Ke Karlovu 3, Prague 12116 2, Czech Republic.Fotonik (creator_code:org_t)

In:Faraday discussions: Royal Society of Chemistry (RSC)222:0, s. 135-1481359-66401364-5498

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NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Other Chemistry ...

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