Achieving Efficient Self‐Driven Full‐Stokes Photodetection in Optically Active Ferroelectric

(1, where OA is n-octylammonium, EA is ethylammonium), capable of realizing a self-driven full-Stokes polarization detection. Utilizing the bulk photovoltaic effect in 1, simultaneous detection of both linearly and circularly polarized light can be achieved without requiring an external bias. The in-plane photodetection configuration exhibits a high linear polarization ratio of 2.7 and a circular polarization anisotropy factor of 0.46. More importantly, the full-Stokes polarization detection achieves low average measurement errors for the Stokes parameters of 3.2%-5.3%. This study establishes a new paradigm for the rational design of ferroelectric materials that enable self-driven, filterless full-Stokes polarization detection.