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    Aonuma, Osamu Hoshi, Yusuke Tayagaki, Takeshi Novikov, Alexey Yurasov, Dmitry and Usami, Noritaka 2015. Control of surface dip diameter in Si-based photonic nanostructures by changing growth temperature of Ge quantum dot multilayer structures and its impact on their optical properties. Japanese Journal of Applied Physics, Vol. 54, Issue. 8S1, p. 08KA01.


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  • MRS Proceedings, Volume 1510
  • January 2013, mrsf12-1510-dd05-02

Nanostructure and Strain Field in Vertically Aligned Nano-Islands for Si/Ge 2D Photonic Nanocrystals.

  • Takanori Kiguchi (a1), Yusuke Hoshi (a1), Takeshi Tayagaki (a2) (a3) and Noritaka Usami (a1)
  • DOI: http://dx.doi.org/10.1557/opl.2013.446
  • Published online: 22 March 2013
Abstract
Abstract

The local strain field and the intermixing of a Ge nano-islands (NIs)/Si spacer stacked structure in a novel solar cell with a p-i-n type Si single crystal with two-dimensional photonic nanocrystals connecting to the vertically aligned NIs were analyzed using electron microscopy. High-angle annular dark field-scanning transmission electron microscope (HAADF-STEM) images show intermixing between Ge and Si clearly and reveal that the surface segregation of Ge becomes advanced. The average composition of the NIs is Ge0.42Si0.58, which is almost constant in a row of vertically aligned NIs. The local strain analysis results obtained from the high-resolution transmission electron microscope (HRTEM) images show that the strain state is partially relaxed after the elastic relaxation of NIs.

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