Polarization‐sensitive photodetection has drawn a great deal of research interests, which takes advantage of anisotropy from the lattice structure or the morphology of active material. However, no photodetectors combined these two kinds of anisotropy together for linearly polarized photodetection. Here, a photodetector based on cesium lead iodide (β‐CsPbI₃) nanowire array with anisotropic crystal structure is demonstrated. Owing to the crystal structure and morphology anisotropy of the β‐CsPbI₃ nanowires, the device exhibited high sensitivity to linearly polarized light with a photocurrent anisotropy ratio of 2.68 and 2.17 on rigid and flexible substrates, respectively, which was much higher than existing linearly polarized photodetectors. In addition, the photocurrent anisotropy ratio of the device on flexible substrate only dropped by 5% after 500 bending cycles, indicating excellent flexibility and folding endurance of flexible CsPbI₃ device. The application of anisotropic CsPbI₃ nanowires in polarization‐sensitive photodetection might provide new functionalities in novel optoelectronic applications.

中文翻译：

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基于全无机钙钛矿CsPbI3纳米线的柔性线性偏振光电探测器

偏振敏感的光电检测已经引起了很多研究兴趣，它利用了晶格结构或活性材料形态的各向异性。然而，没有光检测器将这两种各向异性结合在一起用于线性偏振光检测。在这里，基于铯光电探测器碘化铅（β-CsPbI ₃）纳米线阵列与各向异性晶体结构是证明。由于晶体结构和形态各向异性β-CsPbI ₃纳米线，该器件对线性偏振光表现出高灵敏度，在刚性和柔性基板上的光电流各向异性比分别为2.68和2.17，远高于现有的线性偏振光电探测器。此外，在500个弯曲周期后，该器件在柔性基板上的光电流各向异性比率仅下降了5％，表明柔性CsPbI ₃器件具有出色的柔性和耐折性。各向异性CsPbI ₃纳米线在偏振敏感光电检测中的应用可能会在新型光电应用中提供新的功能。