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  • 标题:Ge/Si core/shell quantum dots in alumina: tuning the optical absorption by the core and shell size
  • 本地全文:下载
  • 作者:Nikolina Nekić ; Jordi Sancho-Parramon ; Ivančica Bogdanović-Radović
  • 期刊名称:Nanophotonics
  • 印刷版ISSN:2192-8606
  • 电子版ISSN:2192-8614
  • 出版年度:2017
  • 卷号:6
  • 期号:5
  • 页码:1055-1062
  • DOI:10.1515/nanoph-2016-0133
  • 出版社:Walter de Gruyter GmbH
  • 摘要: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..
  • 关键词:Ge;Si core;shell quantum dots ; quantum confinement ; absorption ; self;assembly
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