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

| Request a personal copy from author

Preview

PDF - Accepted Version Download (7MB) | Preview

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 title Project leader Project code Project type Sunčeve ćelije bazirane na samouređenim nanočesticama u staklu Maja Buljan UNSPECIFIED Zaklada Adris Nano-mreže kvantnih točaka u staklima: Od samouređenja do pretvorbe energije i pohrane vodika Maja Buljan UIP-11-2013-2334 HRZZ Croatian Centre of Excellence for Advanced Materials and Sensing devices Milko Jakšić UNSPECIFIED UNSPECIFIED
Depositing User:	Maja Mičetić
Date Deposited:	02 Jul 2015 11:20
URI:	http://fulir.irb.hr/id/eprint/2009
DOI:	10.1088/0957-4484/26/6/065602

Actions (login required)

View Item