Engineering Polar Oxyitrides: Hexagonal Perovskite BaWON2

Judith Oró‐Solé, Ignasi Fina, Carlos Frontera, Jaume Gàzquez, Clemens Ritter, Marina Cunquero, Pablo Loza‐Alvarez, Sergio Conejeros, Pere Alemany, , Enric Canadell, Josep Fontcuberta, Amparo Fuertes;

Angew. Chem. Int. Ed. 2020, 59, 18395–18399;      DOI:10.1002/anie.202006519

In the quest for materials of narrow band gap, oxynitrides are excellent candidates. Aiming at obtaining a polar materials of narrow gap, oxynitides are developed here having an hexagonal structure and anion ordering that leads to a non centrosymmetric structures. As such,  here BaWON2 is synthesized and we demonstrate its polar character and large photo absorptivity.