Bilayered Dion-Jacobson lead-iodine hybrid perovskite with aromatic spacer for broadband photodetection

Dion-Jacobson (DJ) phase hybrid perovskites have been proven to improve the photovoltaic performance of the devices due to its unique structure. At present, some DJ hybrid perovskites have been reported and used for photodetection filed, but most of them are based on lead-bromide systems, which is not conducive to construct broadband photodetection devices due to the limitation of intrinsic absorption. Herein, we constructed a bilayered DJ hybrid perovskite (3AMPY)(EA)Pb2I7 (3AMPY2+ is 3-(aminomethyl)pyridinium, EA+ is ethylammonium) using an aromatic spacer, which exhibit large current on/off ratios of ∼ 104 under 520 and 637 nm illumination. In particular, the single crystal device based on (3AMPY)(EA)Pb2I7 shows a distinguished detectivity of 7.4 ×1012 Jones and a high responsivity of 0.89 A/W under 637 nm illumination. Such finding not only enriches the quantities of DJ hybrid perovskites, but also provides useful assistance for constructing high-performance optoelectronic device in the future.