%0 Journal Article %1 doi:10.1002/pssr.202000054 %A Jin, Lei %A Zapf, Michael %A Stübinger, Martin %A Kamp, Martin %A Sing, Michael %A Claessen, Ralph %A Jia, Chun-Lin %D 2020 %J Phys. Status Solidi RRL %K a %N 6 %P 2000054 %R 10.1002/pssr.202000054 %T Atomic-scale interface structure in domain matching epitaxial BaBiO$_3$ thin films grown on SrTiO$_2$ substrates %U https://onlinelibrary.wiley.com/doi/abs/10.1002/pssr.202000054 %V 14 %X The electronic structures of $BaBiO_3$ (BBO) thin films grown on $SrTiO_3$ substrates are found to be thickness dependent. The origin of this behavior remains under debate and has been suggested to be attributed to the structural and compositional modifications at the BBO/$SrTiO_3$ interface during the first stage of film growth. Though a wetting layer with thickness of ≈1 nm has been experimentally identified at the interface, details on the microstructures of such a layer and their effect on the subsequent film growth are lacking so far, particularly at the atomic scale. Herein, atomic-resolution scanning transmission electron microscopy is used to study the interface structure of a 30 nm-thick BBO film grown on an Nb-doped $SrTiO_3$ (STO) substrate through domain matching epitaxy. An interfacial δ-$Bi_2O_3$ (BO)-like phase with fluorite structure is identified, showing a layer-by-layer spacing of ≈3.2 Å along the growth direction. The orientation relationship between the BO-like phase and surrounding perovskites (P) is found to be <001>BO||<001>P and <110>BO||<100>P. The presence of the BO-like phase results in two types of interfaces, i.e., a coherent BO/STO and a semicoherent BBO/BO interface. Thickness variations are observed in the BO-like layer, resulting in the formation of antiphase domains in the BBO films.

@article{doi:10.1002/pssr.202000054, abstract = {The electronic structures of $BaBiO_3$ (BBO) thin films grown on $SrTiO_3$ substrates are found to be thickness dependent. The origin of this behavior remains under debate and has been suggested to be attributed to the structural and compositional modifications at the BBO/$SrTiO_3$ interface during the first stage of film growth. Though a wetting layer with thickness of ≈1 nm has been experimentally identified at the interface, details on the microstructures of such a layer and their effect on the subsequent film growth are lacking so far, particularly at the atomic scale. Herein, atomic-resolution scanning transmission electron microscopy is used to study the interface structure of a 30 nm-thick BBO film grown on an Nb-doped $SrTiO_3$ (STO) substrate through domain matching epitaxy. An interfacial δ-$Bi_2O_3$ (BO)-like phase with fluorite structure is identified, showing a layer-by-layer spacing of ≈3.2 Å along the growth direction. The orientation relationship between the BO-like phase and surrounding perovskites (P) is found to be <001>BO||<001>P and <110>BO||<100>P. The presence of the BO-like phase results in two types of interfaces, i.e., a coherent BO/STO and a semicoherent BBO/BO interface. Thickness variations are observed in the BO-like layer, resulting in the formation of antiphase domains in the BBO films.}, added-at = {2020-03-23T11:48:58.000+0100}, author = {Jin, Lei and Zapf, Michael and Stübinger, Martin and Kamp, Martin and Sing, Michael and Claessen, Ralph and Jia, Chun-Lin}, biburl = {https://www.bibsonomy.org/bibtex/2008b9ddfda0741261986ead7fda80254/ctqmat}, day = 11, doi = {10.1002/pssr.202000054}, eprint = {https://onlinelibrary.wiley.com/doi/pdf/10.1002/pssr.202000054}, interhash = {1658f68b5fd9407cc54ccd68b745319b}, intrahash = {008b9ddfda0741261986ead7fda80254}, journal = {Phys. Status Solidi RRL}, keywords = {a}, month = {03}, number = 6, pages = 2000054, timestamp = {2023-10-20T08:01:04.000+0200}, title = {Atomic-scale interface structure in domain matching epitaxial BaBiO$_{\mathbf{3}}$ thin films grown on SrTiO$_{\mathbf{2}}$ substrates}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/pssr.202000054}, volume = 14, year = 2020 }