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

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Luna E, Wu M, Puustinen J, Guina M, Trampert A
Zeitschrift: Journal of Applied Physics
Verlag: American Institute of Physics Inc.
Jahr der Veröffentlichung: 2015
Band: 117
Heftnummer: 18
ISSN: 1089-7550
Sprache: Englisch


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-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

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


Zusätzliche Organisationseinheit(en)
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


Einrichtungen weiterer Autorinnen und Autoren

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


Zitierweisen

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: 

Zuletzt aktualisiert 2019-29-05 um 15:34