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

Despoja, Vito; Basioli, Lovro; Parramon, Jordi Sancho; Mičetić, Maja (2020) Optical absorption in array of Ge/Al-shell nanoparticles in an Alumina matrix. Scientific Reports, 10 . ISSN 2045-2322

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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.

Item Type: Article
Uncontrolled Keywords: Ge/Al ; core/shell ; optical properties
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Materials Physics
Project titleProject leaderProject codeProject type
3D mreže kompleksnih Ge-baziranih nanostruktura u staklima: svojstva i primjene-NetNanoMaja BuljanIP-2018-01-3633HRZZ
Depositing User: Maja Mičetić
Date Deposited: 18 Mar 2020 13:02
DOI: 10.1038/s41598-019-56673-8

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