Abstract
Highly carbon doped GaAs layers grown by metal organic vapor phase epitaxy (MOVPE) Has been investigated by transmission electron microscopy (TEM). Electron irradiation has been applied to generate point defects interacting with native defects, e.g., substitutional carbon. This irradiation induces periodically arranged striations perpendicular to the growth direction, which were observedin situ by TEM. Furthermore, precipitates (Ø= 10-15nm) were formed containing non-crystalline material, which most likely is gallium. To explain these phenomena a precipitation mechanism is proposed. It involvs small fluctuations of the incorporated C as well as the interaction of irradiation induced point defects, mainly As and C interstitials and As vacancies.
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Werner, P., Gösele, U. & Kohda, H. Electron Beam Enhanced Precipitation in Highly Carbon Doped GaAs Layers. MRS Online Proceedings Library 439, 203–208 (1996). https://doi.org/10.1557/PROC-439-203
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DOI: https://doi.org/10.1557/PROC-439-203