Spontaneous formation of nanostructures by surface spinodal decomposition in GaAs1-xBix epilayers

Journal article
(Original article)


Publication Details

Author(s): Luna E, Wu M, Puustinen J, Guina M, Trampert A
Journal: Journal of Applied Physics
Publisher: American Institute of Physics Inc.
Publication year: 2015
Volume: 117
Journal issue: 18
ISSN: 1089-7550
Language: English


Abstract


We report on the spontaneous formation of lateral composition modulations (LCMs) in Ga(As,Bi) epilayers grown by low-temperature (<300 °C) molecular beam epitaxy (MBE) on GaAs(001). Both cross-section and plan-view transmission electron microscopy techniques are used to investigate the nature of the LCMs, consisting of Bi-rich cylinder-like nanostructures lying along the [001] growth direction. The observed LCMs are the consequence of a two-dimensional phase separation process occurring at the surface of the growing epilayers, and their columnar nature is consistent with a surface-directed spinodal decomposition process. Although LCMs are thermodynamically driven, we show how they can be kinetically controlled, in particular, through the As/Ga flux ratio and the substrate temperature. This is a result of LCMs developing from surface atomic diffusion processes, since the atomic dimer configurations on the surface alter adatom diffusivity. The significant role of the surface reconstructions is also discussed.







FAU Authors / FAU Editors

Wu, Mingjian Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)


Additional Organisation
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


External institutions with authors

Paul-Drude-Institut für Festkörperelektronik - Leibniz-Institut im Forschungsverbund Berlin e.V.
Tampere University of Technology


How to cite

APA:
Luna, E., Wu, M., Puustinen, J., Guina, M., & Trampert, A. (2015). Spontaneous formation of nanostructures by surface spinodal decomposition in GaAs1-xBix epilayers. Journal of Applied Physics, 117(18). https://dx.doi.org/10.1063/1.4919896

MLA:
Luna, Esperanza, et al. "Spontaneous formation of nanostructures by surface spinodal decomposition in GaAs1-xBix epilayers." Journal of Applied Physics 117.18 (2015).

BibTeX: 

Last updated on 2019-29-05 at 15:34