Self-Assembly of 2D Hybrid Double Perovskites on 3D Cs2AgBiBr6 Crystals towards Ultrasensitive Detection of Weak Polarized Light

We report the self-assembly of 2D double perovskite (BLA)(2)CsAgBiBr7 (BLA=benzylammonium) on 3D Cs2AgBiBr6 crystals, providing the first demonstration of polarization-sensitive photodetection using lead-free double perovskite heterocrystals (HCs). The (BLA)(2)CsAgBiBr7/Cs2AgBiBr6 HC successfully combines the anisotropy of 2D double perovskites with the well-defined interface provided by heterogeneous integration. Driven by the built-in electric field in junction, photodetectors of HCs exhibit unique polarization dependence of zero-bias photocurrent with a large anisotropy ratio up to 9, which is 6 times amplified as compared to the pristine 2D (BLA)(2)CsAgBiBr7. More importantly, the present devices can remain polarization-sensitive with incident light intensity down to the nW cm(-2) level. Our study on lead-free hybrid perovskite HCs marks a step toward establishing robust material foundations for fundamental scientific investigations and the development of optoelectronic devices.