Stability of monodomain III-V crystals and antiphase boundaries over a Si monoatomic step - Archive ouverte HAL
Article Dans Une Revue Applied Surface Science Année : 2024

Stability of monodomain III-V crystals and antiphase boundaries over a Si monoatomic step

Résumé

Here, we compare the stabilities of different III-V crystals configurations on stepped Si substrates, with or without anti-phase boundaries, for abrupt and compensated interfaces, using density functional theory. Thermodynamic stability of the different heterostructures is analyzed with an atomic scale description of charge densities distribution and mechanical strain. We show that the configuration where a III-V crystal adapts to a Si monoatomic step through change of charge compensation at the hetero-interface is much more stable than the configuration in which an antiphase boundary is formed. This study thus demonstrates that antiphase boundaries commonly observed in III-V/Si samples are not originating from Si monoatomic step edges but from inevitable kinetically driven coalescence of monophase 3D III-V islands.
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hal-04722879 , version 1 (10-10-2024)

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Divishth Gupta, Sreejith Pallikkara Chandrasekharan, Simon Thebaud, Charles Cornet, Laurent Pedesseau. Stability of monodomain III-V crystals and antiphase boundaries over a Si monoatomic step. Applied Surface Science, 2024, 678, pp.161076. ⟨10.1016/j.apsusc.2024.161076⟩. ⟨hal-04722879⟩
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