Combinatorial substrate epitaxy: a new approach to growth of complex metastable compounds

BiFeO3/La0.7Sr0.3MnO3 heterostructures deposited on spark plasma sintered LaAlO3 substrates

“…The bands of the LaAlO 3 substrate were sharp and intense, while the BiFeO 3 film values are slightly more diffuse than the substrate, which can be attributed to local strains in the epitaxial films or the inhomogeneous strains in the film resulting from relaxation phenomena. 3,9,10,26 Nevertheless, all grains investigated display otherwise similar patterns with good CI values, attesting a good crystalline quality, and confirming the epitaxial perovskite phase formation for the film. The local epitaxial quality was further confirmed by comparing the misorientation angle between the individual local orientations in a given grain to the average orientation of that grain (the average values were plotted in Fig.…”

“…Color variations between the film and substrate (see the purple/pink pair within the white boxes) are usually within a few degrees of each other on the color key shown in Fig. 1(c), and small angular misorientations such as these have been observed previously in CSE grown films 10,12 and are expected to relieve misfit strains in the heterostructures. 23 The in-plane (IP) alignments between the substrate and grain exhibited identical characteristics to the out-of-plane (OP) alignments discussed here.…”

“…Prior work using CSE has focused on understanding growth of non-isostructural film-substrate pairs, 8,9,11,12 engineering phase stability in complex materials, 10 and establishing the role of substrate and film phase/orientation on photochemistry. 13 Complex oxide multilayer (heterostructures) films exhibiting functional properties have not been investigated using CSE.…”

“…Here, we develop further a high-throughput synthesis process (called combinatorial substrate epitaxy, or CSE) where an oxide film is grown epitaxially on a polycrystalline substrate, [8][9][10][11][12] which should allow functional properties to be investigated across the entirety of epitaxial orientation space. Prior work using CSE has focused on understanding growth of non-isostructural film-substrate pairs, 8,9,11,12 engineering phase stability in complex materials, 10 and establishing the role of substrate and film phase/orientation on photochemistry.…”

Computational Approach for Epitaxial Polymorph Stabilization through Substrate Selection

“…7 To broadly explore new functional polymorphs using epitaxy, a more systematic, e cient and rational screening methodology of substrates is desirable. Several recent experimental combinatorial e↵orts 8,9 highlight the need to correctly identify a suitable substrate as well as the experimental conditions for high-throughput epitaxial film growth.…”