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Pregled bibliografske jedinice broj: 905980

Ge/Si core/shell quantum dots in alumina: tuning the optical absorption by the core and shell size


Nekić, Nikolina; Sancho-Parramon, Jordi; Bogdanović Radović, Ivančica; Grenzer, Joerg; Huebner, Rene; Bernstorff, Sigrid; Ivanda, Mile; Buljan, Maja
Ge/Si core/shell quantum dots in alumina: tuning the optical absorption by the core and shell size // Nanophotonics, 6 (2017), 5; 1055-1062 doi:10.1515/nanoph-2016-0133 (međunarodna recenzija, članak, znanstveni)


Naslov
Ge/Si core/shell quantum dots in alumina: tuning the optical absorption by the core and shell size

Autori
Nekić, Nikolina ; Sancho-Parramon, Jordi ; Bogdanović Radović, Ivančica ; Grenzer, Joerg ; Huebner, Rene ; Bernstorff, Sigrid ; Ivanda, Mile ; Buljan, Maja

Izvornik
Nanophotonics (2192-8606) 6 (2017), 5; 1055-1062

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

Ključne riječi
Ge/Si core/shell quantum dots ; quantum confinement ; absorption ; self-assembly

Sažetak
Ge/Si core/shell quantum dots (QDs) recently received extensive attention due to their specific properties induced by the confinement effects of the core and shell structure. They have a type II confinement resulting in spatially separated charge carriers, the electronic structure strongly dependent on the core and shell size. Herein, the experimental realization of Ge/Si core/shell QDs with strongly tunable optical properties is demonstrated. QDs embedded in an amorphous alumina glass matrix are produced by simple magnetron sputtering deposition. In addition, they are regularly arranged within the matrix due to their self-assembled growth regime. QDs with different Ge core and Si shell sizes are made. These core/shell structures have a significantly stronger absorption compared to pure Ge QDs and a highly tunable absorption peak dependent on the size of the core and shell. The optical properties are in agreement with recent theoretical predictions showing the dramatic influence of the shell size on optical gap, resulting in 0.7 eV blue shift for only 0.4 nm decrease at the shell thickness. Therefore, these materials are very promising for light-harvesting applications.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
HRZZ-UIP-2013-11-2334 - Nano-mreže kvantnih točaka u staklima: Od samouređenja do pretvorbe energije i pohrane vodika (Maja Buljan, )

Ustanove
Institut "Ruđer Bošković", Zagreb

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


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