Minutea??Scale Rapid Crystallization of a Highly Dichroic 2D Hybrid Perovskite Crystal toward Efficient Polarizationa??Sensitive Photodetector

摘要： 2D hybrid perovskites demonstrate better performances than 3D counterparts in certain optoelectronic devices, whereas their natural attributes cannot be extracted from microcrystalline films, such as the natural dichroism for polarized light detection. Herein, for the first time, unusual minute-scale rapid crystallization is developed to grow bulk crystals of 2D hybrid perovskite, (FPEA)2PbI4 (1, FPEA is p-fluorophenethylammonium), which enables superior carrier transport property (≈64.1 ns) and low trap density (≈1010 cm?3). The rapid growth rate of 27.3 mm3 h?1 is almost two orders of magnitude higher than for other 2D counterparts. Strikingly, its natural quantum-confined motif results in extraordinary dichroism with optical absorption ratio αc/αa ≈ 2.05, revealing great promises for polarized light detection. Consequently, crystal-based photodetectors exhibit large photocurrent dichroic ratio Imax/Imin ≈ 2.1, fast response time (400 μs), and high detectivity (1011 Jones) to the polarized light. This is the record-fast crystallization of highly dichroic 2D hybrid perovskites, which opens a new prospect for their future optoelectronic device applications.