In this study, single crystal ZnO microwires (MW) with size of ∼5.4 mm × 30 μm are prepared through a chemical vapor deposition technique at high temperature (1200 °C). Subsequently, p-type conducting polyaniline (PANI) polymers with different conductivities are densely coated on part of the ZnO MW to construct organic/inorganic core-shell heterojunction photodetectors. The hetero-diodes reach an extremely high rectification ratio (I_+3V/I_-3V) of 749230, and a maximum rejection ratio (I_350nm/I_dark) of 3556 (at -3 V), indicating great potential as rectified switches. All the heterojunction devices exhibit strong response to ultraviolet (UV) radiation with high response speed. Moreover, the obvious photovoltaic behavior can also be obtained, allowing the device to operate as an independent and stable unit without externally supplied power. Under 0 V bias voltage, the self-powered photodetector shows a maximum responsivity of 0.56 mA W⁻¹ and a rapid response speed of 0.11 ms/1.45 ms (rise time/decay time). Finally, a finite difference time domain (FDTD) simulation is performed to further demonstrate the interaction mechanism between the incident light field and the hexagonal cavity, which strongly supports the enhancement of the light absorption in whispering-gallery-mode resonator.

在这项研究中，通过化学气相沉积技术在高温（1200°C）下制备了尺寸约为 5.4 mm × 30 μm 的单晶 ZnO 微线（MW）。随后，将具有不同电导率的 p 型导电聚苯胺 (PANI) 聚合物致密涂覆在部分 ZnO MW 上，以构建有机/无机核壳异质结光电探测器。异质二极管达到749230的极高整流比 (I _+3V /I _-3V ) 和最大抑制比 (I _350nm /I_暗) 的 3556（-3 V），表明作为整流开关的潜力很大。所有异质结器件都对紫外线（UV）辐射表现出强烈的响应速度。此外，还可以获得明显的光伏行为，允许设备作为独立稳定的单元运行，无需外部供电。在 0 V 偏置电压下，自供电光电探测器显示出 0.56 mA W ^-1的最大响应度和 0.11 ms/1.45 ms（上升时间/衰减时间）的快速响应速度。最后，进行了有限差分时域 (FDTD) 模拟，以进一步证明入射光场与六边形腔之间的相互作用机制，这有力地支持了回音壁模式谐振器中光吸收的增强。