Two-Dimensional Guanidine-Based Hybrid Perovskites with Strong Dichroism for Multiwavelength Polarization-Sensitive Detection

Two-dimensional (2D) organic-inorganic hybrid perovskites, benefiting from their natural anisotropy of quantum-well motifs and optical properties, have shown remarkable polarization-dependent responses superior to the 3D counterparts. Here, for the first time, multiwavelength polarization-sensitive detectors were fabricated by using single crystals of a guanidine-based 2D hybrid perovskite, (BA)(2)(GA)Pb2I7 (where BA(+) is n-butylammonium and GA(+) is guanidium). Its unique 2D quantum-well structure results in strong crystallographic-dependence of optical absorption. Strikingly, our crystal-based photodetector exhibits a prominent photocurrent dichroic ratio (I-max/I-min) of similar to 2.2 at 520 nm, higher than the typical 2D inorganic materials (GeSe, similar to 1.09, PdSe2, similar to 1.8). In addition, notable dichroic ratios of 1.29 and 1.23 at 405 nm and 637 nm are also created for the multiwavelength polarized-light detection. The prominent detecting performances, including low dark current (1.6x10(-11) A), considerable on/off ratio (similar to 2x10(3)), high photodetectivity (similar to 3.3x10(11) Jones) and responsivity (similar to 12.01 mA W-1), make (BA)(2)(GA)Pb2I7 a promising candidate for polarized-light detection. This work sheds light on the rational engineering of new 2D hybrid perovskites for the high-performance optoelectronic device applications.

Automated summary

Two-dimensional organic-inorganic hybrid perovskites with a guanidine-based crystal structure were used to fabricate multiwavelength polarization-sensitive detectors, showing strong crystallographic-dependent optical absorption and remarkable photocurrent dichroic ratios at different wavelengths, making them promising candidates for polarized-light detection applications in high-performance optoelectronic devices.