Self-Assembly of 2D Hybrid Double Perovskites on 3D Cs 2 AgBiBr 6 Crystals towards Ultrasensitive Detection of Weak Polarized Light.

We report the self-assembly of 2D double perovskite (BLA) 2 CsAgBiBr 7 (BLA=benzylammonium) on 3D Cs 2 AgBiBr 6 crystals, providing the first demonstration of polarization-sensitive photodetection using lead-free double perovskite heterocrystals (HCs). The (BLA) 2 CsAgBiBr 7 /Cs 2 AgBiBr 6 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 CsAgBiBr 7 . 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.