Direct Observation of Transition from Solid-State to Molecular-Like Optical Properties in Ultrasmall Silicon Carbide Nanoparticles

David Beke, Anna Fučíková, Tibor Z. Jánosi, Gyula Károlyházy, Bálint Somogyi, Sándor Lenk, Olga Krafcsik, Zsolt Czigány, János Erostyák, K. Kamarás, Jan Valenta, A. Gali

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We employ time-dependent photoluminescence (PL) and steady-state PL excitation (PLE) measurements to study the size-dependent optical properties of ultrasmall silicon carbide (SiC) nanoparticles (NPs). We find that the nature of the optical transition transforms from solid-state indirect gap to molecular-like as the diameter of spherical SiC NPs is reduced from 4-6 to 1-3 nm with a smooth transition in between. We deduce the radiative lifetimes of SiC NPs that are well supported by ab initio time-dependent density functional theory calculations on realistically large SiC NPs with realistic surface terminations, including the solvation effects.

Original languageEnglish
Pages (from-to)26713-26721
Number of pages9
JournalJournal of Physical Chemistry C
Volume122
Issue number46
DOIs
Publication statusPublished - Nov 21 2018

Fingerprint

Silicon carbide
silicon carbides
Optical properties
Nanoparticles
solid state
optical properties
nanoparticles
Photoluminescence
photoluminescence
Optical transitions
Solvation
radiative lifetime
optical transition
Density functional theory
solvation
density functional theory
silicon carbide
excitation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Direct Observation of Transition from Solid-State to Molecular-Like Optical Properties in Ultrasmall Silicon Carbide Nanoparticles. / Beke, David; Fučíková, Anna; Jánosi, Tibor Z.; Károlyházy, Gyula; Somogyi, Bálint; Lenk, Sándor; Krafcsik, Olga; Czigány, Zsolt; Erostyák, János; Kamarás, K.; Valenta, Jan; Gali, A.

In: Journal of Physical Chemistry C, Vol. 122, No. 46, 21.11.2018, p. 26713-26721.

Research output: Contribution to journalArticle

Beke, D, Fučíková, A, Jánosi, TZ, Károlyházy, G, Somogyi, B, Lenk, S, Krafcsik, O, Czigány, Z, Erostyák, J, Kamarás, K, Valenta, J & Gali, A 2018, 'Direct Observation of Transition from Solid-State to Molecular-Like Optical Properties in Ultrasmall Silicon Carbide Nanoparticles', Journal of Physical Chemistry C, vol. 122, no. 46, pp. 26713-26721. https://doi.org/10.1021/acs.jpcc.8b07826
Beke, David ; Fučíková, Anna ; Jánosi, Tibor Z. ; Károlyházy, Gyula ; Somogyi, Bálint ; Lenk, Sándor ; Krafcsik, Olga ; Czigány, Zsolt ; Erostyák, János ; Kamarás, K. ; Valenta, Jan ; Gali, A. / Direct Observation of Transition from Solid-State to Molecular-Like Optical Properties in Ultrasmall Silicon Carbide Nanoparticles. In: Journal of Physical Chemistry C. 2018 ; Vol. 122, No. 46. pp. 26713-26721.
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