Uniaxial‐Oriented Chiral Perovskite for Flexible Full‐Stokes Polarimeter

Abstract Full‐Stokes polarization detection, with high integration and portability, offers an efficient path toward next‐gen multi‐information optoelectronic systems. Nevertheless, current techniques relying on optical filters create rigid and bulky configurations, limiting practicality. Here, a flexible, filter‐less full‐Stokes polarimeter featuring a uniaxial‐oriented chiral perovskite film is first reported. It is found that, the strategic manipulation of the surfactant‐mediated Marangoni effect during blade coating, is crucial for guiding an equilibrious mass transport to achieve oriented crystallization. Through this approach, the obtained uniaxial‐oriented chiral perovskite films inherently possess anisotropy and chirality, and thereby with desired sensitivity to both linearly polarized light and circularly polarized light vectors. The uniaxial‐oriented crystalline structure also improves photodetection, achieving a specific detectivity of 5.23 × 10 13 Jones, surpassing non‐oriented devices by 10×. The as‐fabricated flexible polarimeters enable accurate capture of full‐Stokes polarization without optical filters, exhibiting slight detection errors for the Stokes parameters: Δ S 1 = 9.2%, Δ S 2 = 8.6%, and Δ S 3 = 6.5%, approaching the detection accuracy of optics‐filter polarimeters. This proof of concept also demonstrates applications in matrix polarization imaging.