Room temperature excitonic coupling in self-assembled copper - Fullerene hybrid films exposed to ambient air

0587018 - ÚJF 2025 RIV GB eng J - Journal Article
Lavrentiev, Vasyl - Chvostová, Dagmar - Klementová, Mariana - Kuldová, Karla - de Prado, Esther - Vacík, Jiří - Lavrentieva, Inna - Dejneka, Alexandr
Room temperature excitonic coupling in self-assembled copper - Fullerene hybrid films exposed to ambient air.
Carbon. Roč. 226, JUN (2024), č. článku 119230. ISSN 0008-6223. E-ISSN 1873-3891
R&D Projects: GA MŠMT(CZ) EH22_008/0004591; GA MŠMT LM2023051
Institutional support: RVO:68378271 ; RVO:61389005
Keywords : Fullerene * Copper oxide * Hybrid nanostructure * Exciton * Resonant strong coupling
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect); Coating and films (FZU-D)
Impact factor: 10.9, year: 2022
Method of publishing: Open access
https://doi.org/10.1016/j.carbon.2024.119230

Analytically sound combination of organic and inorganic semiconductors in designing functional hybrid nanomaterials promises new advances in nanoscience and in creation of next-generation optoelectronic devices. In this work, we report on combining two contrasting semiconductors (inorganic and organic) possessing attractive optical and electronic properties, namely Cu2O (in form of small single-crystalline nanoparticles, NPs) and C-60-fullerene (as a medium supporting the NP ensemble), which were formed within the well-controlled Cu-x(O-y)C-60 hybrid films through self-assembling and ambient air exposure of the vapour-deposited Cu and C-60 mixture. The controllability of the hybrid film nanostructure was established and verified through systematic study of the films using Rutherford backscattering spectrometry, transmission electron microscopy, X-ray diffraction, Raman spectrometry and spectroscopic ellipsometry. The remarkable coincidence of the optical absorption peaks around 3.5 eV, reported for the Wannier-Mott (WM) excitons in a Cu2O crystal and detected for the Frenkel (F) excitons in the pristine C-60 film, allowed us to observe room temperature polaritons as a product of the F-WM excitonic strong coupling. Quite high coupling energy of the FWM hybrid exciton estimated for the Cu-x(O-y)C-60 films in the x interval of 5 < x < 15 (from 390 meV to 610 meV) implies the mediated effect of nanocavity photons and quantum confinement effect, strongly enhancing the hybrid exciton coupling energy. The implemented study discloses the self-assembled Cu-x(O-y)C-60 hybrid films as promising material for application in optoelectronics and nonlinear optics.
Permanent Link: https://hdl.handle.net/11104/0354336