Excellent microwave absorption of lead halide perovskites with high stability

Abstract

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 of their intrinsic properties is still missing. Herein, we report the microwave absorption performance of MAPbX₃ (MA = CH₃NH₃⁺, X = I⁻, Br⁻ or Cl⁻) perovskite crystals in terms of complex permittivity and permeability. We find that the MAPbI₃, MAPbBr₃ and MAPbCl₃ perovskites possess excellent microwave absorbability, and the optimum reflection losses reach −55.23, −54.70 and −46.44 dB at 16.77, 15.46 and 13.54 GHz with a matching thickness of 1.62, 1.76 and 1.95 mm, respectively. Thereafter, we explore the absorption mechanism and find that the microwave absorption properties can be ascribed to the combination of dielectric loss and magnetic loss, but mainly dielectric loss. In addition, the stability of microwave absorbability is also investigated and it is proved to depend significantly on the decomposition of corresponding perovskites. These results highlight the importance of the discovery of microwave absorbability of organic–inorganic lead halide perovskites. More importantly, our study provides perovskite absorbers as a new variable to be considered in the quest for future microwave devices.