Comprehensive Screening of Halogen-Containing Oxide Double Perovskites A₂BXO₆ (X = Cl, Br, and I) for Photovoltaic...

The new halogen-containing oxide double perovskites A₂BXO₆ (X = Cl, Br, and I) have attracted much attention because of their superb electronic properties in halide double perovskites and their high stability in oxide double perovskites. Herein, 408 A₂BXO₆ double perovskites have been systematically screened by high-throughput computation. Refer to the empirical structural factors phase diagram (t-u), which uses large-scale first-principles calculations. Fourteen stable perovskites are finally confirmed; moreover, 11 of them have never been reported before. Our results show that Ba₂AgIO₆ and Sr₂AgIO₆ are the most preferable candidates for photovoltaic applications, of which Sr₂AgIO₆ has balanceable electron and hole effective masses, a quasi-direct band gap, and strong optical absorption. Importantly, Sr₂AgIO₆ was successfully synthesized by the solution method. Our work enriches the family of double perovskites, and the tentative experimental evidence undoubtedly hints at their great potential applications in the near future.