Ferroelectric materials have aroused increasing interest in the field of self-powered ultraviolet (UV) photodetectors for their polarization electric field induced photovoltaic (PV) effect. However, the device performance of currently reported ferroelectric-based self-powered UV detectors remains to be improved. Herein, achievement of high-performance ZnO/Pb_0.95La_0.05Zr_0.54Ti_0.46O₃ (PLZT) heterojunction-based self-powered UV photodetectors is demonstrated by coupling the ferroelectric depolarization electric field (E_dp) and built-in electric field (E_ZnO/PLZT) at the ZnO/PLZT interface with a II-type energy band alignment. The ZnO/PLZT heterojunction-based self-powered UV photodetector shows a remarkable responsivity (R = 3.96 mA W⁻¹) and detectivity (D* = 6.6 × 10¹⁰ Jones), which are by two orders of magnitude larger than those of the device that are produced under similar conditions without ZnO layer. Moreover, the ZnO/PLZT heterojunction-based device exhibits a rapid response (rise time τ_r = 0.04 s, decay time τ_d = 0.05 s), which is faster than most of previous reports. The excellent device performance of the ZnO/PLZT heterojunction-based device can be attributed to the efficient separation and transport of photogenerated carriers caused by the constructive coupling of E_dp and E_ZnO/PLZT. This work offers a feasible and effective strategy for the performance improvement of ferroelectric-based self-powered UV detectors.

中文翻译：

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基于耦合铁电去极化场和异质结内置电位的高性能自供电紫外光电探测器

铁电材料因其极化电场诱导光伏 (PV) 效应而在自供电紫外 (UV) 光电探测器领域引起了越来越多的兴趣。然而，目前报道的基于铁电的自供电紫外探测器的器件性能仍有待提高。这里，高性能成就的ZnO /铅_0.95的La _0.05 Zr的_0.54的Ti _0.46 ø ₃（PLZT）异质结的自供电的UV光电探测器是由铁电去极化电场（耦合证明Ë _DP）和内置电场（Ë_{的ZnO / PLZT}) 在具有 II 型能带排列的 ZnO/PLZT 界面。基于 ZnO/PLZT 异质结的自供电紫外光电探测器显示出显着的响应度 ( R  = 3.96 mA W ^-1 ) 和探测率 ( D * = 6.6 × 10 ¹⁰ Jones)，比其高两个数量级在没有 ZnO 层的类似条件下生产的器件。此外，基于 ZnO/PLZT 异质结的器件表现出快速响应（上升时间 τ _r  = 0.04 s，衰减时间 τ _d = 0.05 s)，这比以前的大多数报告都要快。基于 ZnO/PLZT 异质结器件的优异器件性能可归因于由E _dp和E _ZnO/PLZT的建设性耦合引起的光生载流子的有效分离和传输。这项工作为基于铁电的自供电紫外探测器的性能改进提供了一种可行且有效的策略。