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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10420708" target="_blank" >RIV/00216208:11320/20:10420708 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=FuhalTPD44" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=FuhalTPD44</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c9fd00093c" target="_blank" >10.1039/c9fd00093c</a>

Result language

angličtina

Original language name

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

Original language description

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 (&gt;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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/GJ18-07977Y" target="_blank" >GJ18-07977Y: Study of individual nanoparticles properties with micro-spectroscopy combined with atomic force microscopy.</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Faraday Discussions

ISSN

1359-6640

e-ISSN

—

Volume of the periodical

222

Issue of the periodical within the volume

1.11.2019

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

135-148

UT code for WoS article

000547895100008

EID of the result in the Scopus database

2-s2.0-85087096984