Oxide Analogs of Halide Perovskites and the New Semiconductor Ba2AgIO6
- George VolonakisGeorge VolonakisDepartment of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United KingdomMore by George Volonakis
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- Nobuya SakaiNobuya SakaiDepartment of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United KingdomMore by Nobuya Sakai
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- Henry J. SnaithHenry J. SnaithDepartment of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United KingdomMore by Henry J. Snaith
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- Feliciano Giustino*Feliciano Giustino*E-mail: [email protected]. Phone: (+44) 01865 272380.Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United KingdomMore by Feliciano Giustino
Abstract

The past few years witnessed the rise of halide perovskites as prominent materials for a wide range of optoelectronic applications. However, oxide perovskites have a much longer history and are pivotal in many technological applications. As of today, a rational connection between these important materials is missing. Here, we explore this missing link and develop a novel concept of perovskite analogs, which led us to identify a new semiconductor, Ba2AgIO6. It exhibits an electronic band structure remarkably similar to that of our recently discovered halide double perovskite Cs2AgInCl6, but with a band gap in the visible range at 1.9 eV. We show that Ba2AgIO6 and Cs2AgInCl6 are analogs of the well-known transparent conductor BaSnO3. We synthesize Ba2AgIO6 following a low-temperature solution process, and we perform crystallographic and optical characterizations. Ba2AgIO6 is a cubic oxide double perovskite with a direct low gap, opening new opportunities in perovskite-based electronics optoelectronics and energy applications.
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