Abstract
The formation mechanism of the CuPt-type natural superlattice (NSL), observed in Ga0.5In0.5P grown on (001) GaAs by metalorganic vapor phase epitaxy (MOVPE), is discussed, based mainly on GaAs substrate surface orientation effects on the formation. Reconstruction of steps, extending in the [110] direction, and terraces at the phosphorus rich (001) surface plays an essential role in this model. The structure reconstruction with double periodicity in the [\(\bar 1\)10] direction, observed on the flat (001) As-rich GaAs surface, is assumed to exist as a stable structure even in the (001) P-rich Ga0.5In0.5P surface grown by MOVPE, and to persist still in the presence of steps (step-terrace-reconstruction (STR) model). The STR model, together with the assumptions of preferential sticking of one of the cations (probably In atoms) at step-edges due to a steric effect well explains the NSL formation. An effort for justification of these hypotheses is described. The formation mechanism of CuPt type NSL for III-V-V type alloys is also briefly discussed.
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References
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Suzuki, T., Gomyo, A., Iijima, S. (1992). Natural Superlattice in Ga0.5In0.5P as a Result of Surface Reconstruction. In: Yoshimori, A., Shinjo, T., Watanabe, H. (eds) Ordering at Surfaces and Interfaces. Springer Series in Materials Science, vol 17. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84482-9_41
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DOI: https://doi.org/10.1007/978-3-642-84482-9_41
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