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Pregled bibliografske jedinice broj: 1045838

Optical absorption in array of Ge/Al-shell nanoparticles in an Alumina matrix


Despoja, Vito; Basioli, Lovro; Parramon, Jordi Sancho; Mičetić, Maja;
Optical absorption in array of Ge/Al-shell nanoparticles in an Alumina matrix // Scientific reports, 10 (2020), 65, 12 doi:10.1038/s41598-019-56673-8 (međunarodna recenzija, članak, znanstveni)


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Naslov
Optical absorption in array of Ge/Al-shell nanoparticles in an Alumina matrix

Autori
Despoja, Vito ; Basioli, Lovro ; Parramon, Jordi Sancho ; Mičetić, Maja ;

Izvornik
Scientific reports (2045-2322) 10 (2020); 65, 12

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Ge/Al ; core/shell ; optical properties

Sažetak
The absorption spectra in array of Ge, Al and Ge/Al-shell nanoparticles immersed in alumina (Al2O3) matrix is calculated in framework of ab initio macroscopic dielectric model. It is demonstrated that absorption is strongly enhanced when germanium nanospheres are encapsulated by Al-shell. Two absorption peaks, appearing in the spectra, correspond to low energy ω+ and high energy ω− plasmons which lie in visible and ultraviolet frequency range, respectively. It is demonstrated that in Ge/Al-shell composite the ω+ plasmon exists only because quantum confinement effect which provides larger Ge band gap (Δ ~ 1.5 eV) and thus prevent decay of ω+ plasmon to continuum of interband electron-hole excitation in semiconducting core. Absorption in visible frequency range enhances additional 3 times when alumina is replaced by large dielectric constant insulator, such as SiC, and additional 6 times when Ge core is replaced by wide band-gap insulator, such as Si3N4. Strong enhancement of optical absorption in visible frequency range make this composites suitable for optoelectronic application, such as solar cells or light emitting devices. The simulated plasmon peaks are brought in connection with peaks appearing in ellipsometry measurements.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
QuantiXLie Centre of Excellence-KK.01.1.1.01.0004
HRZZ-IP-2018-01-3633 - 3D mreže kompleksnih Ge-baziranih nanostruktura u staklima: svojstva i primjene (Maja Buljan, HRZZ)

Ustanove
Institut za fiziku, Zagreb,
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Citiraj ovu publikaciju

Despoja, Vito; Basioli, Lovro; Parramon, Jordi Sancho; Mičetić, Maja;
Optical absorption in array of Ge/Al-shell nanoparticles in an Alumina matrix // Scientific reports, 10 (2020), 65, 12 doi:10.1038/s41598-019-56673-8 (međunarodna recenzija, članak, znanstveni)
Despoja, V., Basioli, L., Parramon, J., Mičetić, M. & (2020) Optical absorption in array of Ge/Al-shell nanoparticles in an Alumina matrix. Scientific reports, 10, 65, 12 doi:10.1038/s41598-019-56673-8.
@article{article, year = {2020}, pages = {12}, DOI = {10.1038/s41598-019-56673-8}, chapter = {65}, keywords = {Ge/Al, core/shell, optical properties}, journal = {Scientific reports}, doi = {10.1038/s41598-019-56673-8}, volume = {10}, issn = {2045-2322}, title = {Optical absorption in array of Ge/Al-shell nanoparticles in an Alumina matrix}, keyword = {Ge/Al, core/shell, optical properties}, chapternumber = {65} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • MEDLINE


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