Combinatorial Sputter Synthesis of Single‐Phase La(XYZ)O3 ± σ Perovskite Thin‐Film Libraries: A New Platform for Materials Discovery

• Published in: Advanced engineering materials 2023-08, Vol.25 (16), p.n/a
• Main Authors: Piotrowiak, Tobias H., Zehl, Rico, Suhr, Ellen, Kohnen, Benedikt, Banko, Lars, Ludwig, Alfred
• Format: Article
• Language: English
• Subjects: catalysts; high‐throughput; perovskites; phase formation; screening
• ISSN: 1438-1656; 1527-2648
• DOI: 10.1002/adem.202300437

Compositionally complex perovskites provide the opportunity to develop stable and active catalysts for electrochemical applications. The challenge lies in the identification of single‐phase perovskites with optimized composition for high electrical conductivity. Leveraging a recently discovered effect of self‐organized thin film growth during reactive sputtering, La–Co–Mn–O and La–Co–Mn–Fe–O perovskite (ABO3) thin‐film materials libraries are synthesized. These show phase‐pure La perovskites over a wide range of chemical composition variation for the B‐site elements for deposition temperatures ≥300 °C. It is demonstrated that this approach enables the discovery and tailoring of chemical compositions for desired optical bandgap and electrical conductivity and thereby opens the path for the targeted development of, for example, new high‐performance electrocatalysts. A new and efficient perovskite screening technique is presented that exploits a recently discovered sputtering phenomenon to synthesize single‐phase La perovskites with continuous substitution of B‐site elements by reactive cosputter deposition. The fabrication of single‐phase perovskites with large compositional ranges can be used to tailor properties and identify composition‐dependent trends, such as electrical resistivity, as demonstrated for La–Co–Mn–(Fe–)O systems.