Quantum confinement in Si and Ge nanostructures

Photoemission Studies of Si Quantum Dots with Ge Core: Dots formation, Intermixing at Si-clad/Ge-core interface and Quantum Confinement Effect

Spherical Si nanocrystallites with Ge core (~20nm in average dot diameter) have been prepared by controlling selective growth conditions of lowpressure chemical vapor deposition (LPCVD) on ultrathin SiO2 using alternately pure SiH4 and 5% GeH4 diluted with He. XPS results confirm the highly selective growth of Ge on the pregrown Si dots and subsequently complete coverage by Si selective growth ...

Strain relaxation in self-assembled Ge(Si)/Si quantum dots

Three-dimensional Si/Ge quantum dot crystals.

Modern nanotechnology offers routes to create new artificial materials, widening the functionality of devices in physics, chemistry, and biology. Templated self-organization has been recognized as a possible route to achieve exact positioning of quantum dots to create quantum dot arrays, molecules, and crystals. Here we employ extreme ultraviolet interference lithography (EUV-IL) at a wavelengt...

Revealing Quantitative 3D Chemical Arrangement on Ge#Si Nanostructures

The Journal of Physical Chemistry C is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Letter Revealing Quantitative 3D Chemical Arrangement on Ge#Si Nanostructures Luciano A. Montoro, Marina S. Leite, Daniel Biggemann, Fellipe G. Peternella, K. Joost Batenburg, Gilberto Medeiros-Ribeiro, and Antonio J. Ramirez J. Phys. Chem. C, Article ASAP • DOI: 1...

Local structure of Ge/Si nanostructures: Uniqueness of XAFS spectroscopy

A discussion of the limitations of Raman scattering as applied to Ge/Si nanostructures is followed by a summary of our recent efforts to investigate the local structure of various Ge nanostructures, namely, Ge quantum dots MBE grown on bare Si(1 0 0), on Si(1 1 1) with a 0.3 nm SiO2 coverage, and nanocrystals embedded in SiO2, by X-ray absorption fine structure spectroscopy. For the latter case...