Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Revealing Quantitative 3D Chemical Arrangement on Ge-Si Nanostructures

Full text
Montoro, Luciano A. [1] ; Leite, Marina S. [1] ; Biggemann, Daniel [1] ; Peternella, Fellipe G. [1] ; Batenburg, K. Joost [2] ; Medeiros-Ribeiro, Gilberto [1, 3] ; Ramirez, Antonio J. [1]
Total Authors: 7
[1] Brazilian Synchrotron Light Lab, BR-13083970 Campinas, SP - Brazil
[2] Univ Antwerp, B-2610 Antwerp - Belgium
[3] Hewlett Packard Labs, Palo Alto, CA 94303 - USA
Total Affiliations: 3
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 113, n. 21, p. 9018-9022, MAY 28 2009.
Web of Science Citations: 15

The knowledge of composition and strain with atomic resolution is of utmost importance for the understanding of the chemical and electronic properties of alloyed nanostructures, and they can only be extracted in a self-consistent fashion. As an example, several works have addressed the issue of strain and chemical composition on self-assembled epitaxial islands using different techniques such as X-ray diffraction, scanning probe microscopy and transmission electron microscopy (TEM). However, limited information is available on the 3D chemical composition of such nanostructures. Here, we demonstrate the use of a quantitative high-resolution transmission electron microscopy (QHRTEM) technique to obtain two-dimensional (2D) projected chemical maps of epitaxially grown Ge-Si/Si(001) islands, with high spatial resolution, at different crystallographic orientations. Combining these data with iterative simulation, the reconstruction of the three-dimensional (3D) chemical arrangement on the strained Ge-Si/Si(001) islands was realized. This methodology can be applied for a large variety of strained crystalline systems, such as nanowires, epitaxial islands, quantum dots and wells, and partially relaxed heterostructures. (AU)

FAPESP's process: 07/05165-7 - Quantitative transmission electron microscopy (QHRTEM): developments and application to a study of a nanostructured semiconductor
Grantee:Luciano Andrey Montoro
Support type: Scholarships in Brazil - Post-Doctorate