Preliminary study of As-for-Sb exchange for device applications

The role of the growth conditions in the As-for-Sb exchange reaction is discussed in this paper. Superlattices formed by As exposure of Sb-stabilized GaSb surfaces were grown to compare the resulting anion exchange under different conditions. Statistical experimental design was used to systematically evaluate the effect of different growth conditions. The experiments were performed on GaSb [001] epi-ready substrates in a Varian Gen-II solid source molecular beam epitaxy (MBE) system equipped with both As and Sb crackers. Reflection high-energy electron diffraction (RHEED) was used to monitor the surface reconstruction and to determine the growth rate. High resolution X-ray diffraction (HRXRD) was used to characterize the structures.