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Production of three-dimensional quantum dot lattice of Ge/Si core–shell quantum dots and Si/Ge layers in an alumina glass matrix

Buljan, Maja; Radić, Nikola; Sancho-Parramon, Jordi; Janicki, Vesna; Grenzer, Joerg; Bogdanović Radović, Ivančica; Siketić, Zdravko; Ivanda, Mile; Utrobičić, Antonija; Rene, Huebner; Rene, Weidauer; Vaclav, Valeš; Jan, Endres; Car, Tihomir; Jerčinović, Marko; Roško, Jerko; Bernstorff, Sigrid; Holý, Václav (2015) Production of three-dimensional quantum dot lattice of Ge/Si core–shell quantum dots and Si/Ge layers in an alumina glass matrix. Nanotechnology, 26 (6). 065602-1. ISSN 0957-4484

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Abstract

We report on the formation of Ge/Si quantum dots with core/shell structure that are arranged in a three-dimensional body centered tetragonal quantum dot lattice in an amorphous alumina matrix. The material is prepared by magnetron sputtering deposition of Al2O3/Ge/Si multilayer. The inversion of Ge and Si in the deposition sequence results in the formation of thin Si/Ge layers instead of the dots. Both materials show an atomically sharp interface between the Ge and Si parts of the dots and layers. They have an amorphous internal structure that can be crystallized by an annealing treatment. The light absorption properties of these complex materials are significantly different compared to films that form quantum dot lattices of the pure Ge, Si or a solid solution of GeSi. They show a strong narrow absorption peak that characterizes a type II confinement in accordance with theoretical predictions. The prepared materials are promising for application in quantum dot solar cells.

Item Type: Article
Uncontrolled Keywords: Core/shell; Quantum dots; GISAXS; solar cells
Subjects: NATURAL SCIENCES
NATURAL SCIENCES > Physics
NATURAL SCIENCES > Physics > Condensed Matter Physics
Divisions: Division of Experimental Physics
Division of Laser and Atomic Research and Development
Division of Materials Physics
Projects:
Project titleProject leaderProject codeProject type
Sunčeve ćelije bazirane na samouređenim nanočesticama u stakluMaja BuljanUNSPECIFIEDZaklada Adris
Nano-mreže kvantnih točaka u staklima: Od samouređenja do pretvorbe energije i pohrane vodikaMaja BuljanUIP-11-2013-2334HRZZ
Croatian Centre of Excellence for Advanced Materials and Sensing devicesMilko JakšićUNSPECIFIEDUNSPECIFIED
Depositing User: Maja Buljan
Date Deposited: 02 Jul 2015 11:20
Last Modified: 20 Jan 2016 00:15
URI: http://fulir.irb.hr/id/eprint/2009
DOI: 10.1088/0957-4484/26/6/065602

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