CH₃NH₃PbX₃ perovskites: Excellent microwave absorption

Given the remarkable progress in physical and structural performances of organic-inorganic lead halide perovskites as a superstar in the photovoltaic field, the study of some intrinsic properties are still missing. Herein, we report the microwave absorption performance in CH₃NH₃PbX₃ (X = I, Br and Cl) perovskite single crystals in terms of complex permittivity and permeability. We find that the CH₃NH₃PbI₃, CH₃NH₃PbBr₃ and CH₃NH₃PbCl₃ perovskites possess excellent microwave absorbability, and the optimum reflect losses reach -55.2, -54.7 and -46.4 dB at 16.8, 15.5 and 13.5 GHz with a matching thickness of 1.62, 1.76 and 1.95 mm, respectively. We explore the absorption mechanism. The microwave absorption properties are ascribed to the combination of dielectric and magnetic loss, but mainly for dielectric loss. In addition, the stability of microwave absorbability is also investigated, significantly dependent on the decomposition of corresponding perovskites. These results highlight the importance to the discovery of microwave absorbability in organic-inorganic lead halide perovskites. More importantly, our study provides perovskite absorbers as a new variable to consider in the quest for future microwave devices.