Uniaxial‐Oriented Chiral Perovskite for Flexible Full‐Stokes Polarimeter

RESEARCH ARTICLE www.advmat.de Uniaxial-Oriented Chiral Perovskite for Flexible Full-Stokes Polarimeter Quanlin Chen, Zijin Ding, Li Zhang, Di Wang, Cong Geng, Yanxing Feng, Jia Zhang, Miao Ren, Saisai Li, Saif M. H. Qaid, Yuanzhi Jiang, and Mingjian Yuan* 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 × 1013 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: 𝚫S1 = 9.2%, 𝚫S2 = 8.6%, and 𝚫S3 = 6.5%, approaching the detection accuracy of optics-filter polarimeters. This proof of concept also demonstrates applications in matrix polarization imaging. 1. Introduction Full-Stokes polarization detection enables the comprehen- sive description of the polarization states of light, which holds great promise for next-generation multidimensional optoelectronics.[1–5] For practical application, full-Stokes detec- tion requires the polarimeters to possess specific mechani- cal characteristics for diverse working conditions. To date, the Q. Chen, Z. Ding, L. Zhang, D. Wang, C. Geng, J. Zhang, S. Li, Y. Jiang, M. Yuan State Key Laboratory of Advanced Chemical Power Sources Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Frontiers Science Center for New Organic Matter College of Chemistry Nankai University Tianjin 300071, P. R. China E-mail: yuanmj@nankai.edu.cn The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202400493 DOI: 10.1002/adma.202400493 state-of-the-art full-Stokes polarimeters still rely on integrated optic systems. However, the incorporation of multi-optical lenses results in bulky and complicated device con- figurations, which greatly limits their appli- cation. Accordingly, a highly integrated and filter-less full-Stokes detector is urgently needed particularly for the portable and flex- ible next-generation optoelectronics.[6–10] To address the challenge, developing direct full-Stokes polarization detectors using intrinsically polarization-sensitive semiconductors needs to be well-explored. Metal halide perovskites have attracted widespread attention recently in optoelec- tronics applications owing to their appeal- ing semiconducting properties and solu- tion processability.[11–13] Notably, the struc- tural diversity offers the possibility for a perovskite to possess both anisotropy and chirality characteristics, which is essential for realizing both linear polarization light (LPL) and circular polarization light (CPL) detection.[14,15] Consequently, it is feasible to fabricate solution-processed perovskite thin-film full-Stokes polarimeters. However, achieving this goal remains challenging, since the LPL vector detection lags far be- hind the CPL vector detection.[16–18] This is because the rapid crystallization kinetics of perovskite make the resulting film com- posed of random-stacked polycrystals,[19] resulting in a macro- scopically isotropic film that is insensitive to the LPL-vector. I