Multidirectional Self-Driven Polarization-Sensitive Photodetection Induced by Asymmetric Contact

• • Achieved polarization ratios of 3.3 and 3.1 along the a and b-axes, respectively, demonstrating multidirectional self-driven polarization-sensitive photodetection without requiring alignment with spontaneous polarization. • • Utilized asymmetric Ag/2D perovskite/C contacts to generate a built-in electric field from work function differences, eliminating the need for external bias and enabling self-driven operation in multiple directions. • • The device architecture overcomes the limitation of polar perovskite-based detectors that typically require fabrication along the polarization direction, thus expanding design flexibility for practical applications. • • This approach provides a novel strategy for self-driven polarization-sensitive photodetection, potentially reducing energy consumption and simplifying device integration compared to traditional externally biased detectors.