Structural transformation for BaBiO_3-δ thin films grown on SrTiO₃-buffered Si(001) induced by an in-situ molecular beam epitaxy cooldown process.

ABSTRACT: Oxygen loss is a common defect type in perovskites which is caused by a low oxygen background pressure during growth. BaBiO3-δ thin films are grown by molecular beam epitaxy on SrTiO3-buffered Si(001) substrates. Although activated oxygen is supplied during growth, large amount of oxygen vacancies is created in the thin film depending on the cooldown process. Perovskite structure is obtained when the cooldown process includes an extended period during which activated oxygen is supplied. Another way for inducing the structural transformation is enabled via an ex-situ anneal at molecular oxygen. The transformation into BaBiO3 is manifested as reconstructed octahedra based on transmission electron microscopy, Raman spectroscopy, and photoluminescence. Additionally, smaller out-of-plane lattic

SUBMITTER: Ahmed I 

PROVIDER: S-EPMC12367523 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature