硼酸表面处理对ZnxMg_(1-x)O量子点自驱动光电探测器性能的影响

Performance Enhancement of High-speed Self-driving Photodetectors Based on ZnxMg_(1-x)O Quantum Dots by Boric Acid Solution Treatment

氧化锌材料(ZnO)因其独特的物理和化学性质在自驱动光电探测领域中展现出巨大应用潜力。然而,目前基于ZnO材料的自驱动光电探测器存在结构复杂、响应时间长、响应度低等问题,难以满足实际应用需求。本文构建了一种结构简单、响应速度快的ITO/ZnO量子点(QDs)/Au光电探测器,并提出了一种硼酸(BA)表面处理结合退火的处理工艺,成功降低了ZnO QDs薄膜中的表面态密度,提高了器件光电性能。器件在0 V下响应时间约为1 ms,开/关比达到104,响应度达到8.81 mA/W。将这一工艺应用在Mg2+掺杂ZnO量子点基光电探测器中,同样提高了器件的比探测率和响应度,获得了具有0.93 ms上升时间的高响应速度自驱动光电探测器,Mg2+掺杂量越高,器件的上升时间越短。这项工作证实了BA表面处理结合退火处理工艺对化学合成的ZnO材料性能具有普遍提升作用,有望广泛应用于ZnO基紫外光电探测器的性能优化中。

Zinc oxide nanomaterials(ZnO)hold tremendous potential in the field of self-powered photodetection due to their unique physical and chemical properties.However,self-powered photodetectors based on ZnO nanomate-rials currently face challenges such as complex structures,slow response speed,low responsivity and detectivity etc.,making it difficult to meet practical application requirements.In this study,simple structured ITO/ZnO quan-tum dots(QDs)/Au photodetectors with fast response speed were fabricated.A surface treatment process combining boric acid(BA)surface treatment with annealing was carried out,which successfully reduced the surface state densi-ty in ZnO quantum dot films and increased the device’s detectivity by approximately an order of magnitude.The rise and fall time of the device at 0 V were 1.29 ms and 1.31 ms,respectively,achieving an on/off ratio of 10⁴and a re-sponsivity as high as 8.81 mA/W.Applying this process to bandgap-tunable Mg²⁺-doped quantum dot-based photode-tectors similarly improved the detectivity and responsivity of the devices.A high-response-speed self-powered photo-detector with a rise time of 0.93 ms was obtained,and as the Mg doping concentration increased,the rise time of the device decreased.This work demonstrates that the combined BA surface treatment with annealing process significant-ly enhances the performance of chemically synthesized ZnO materials,with potential widespread application in per-formance optimization of photodetectors based on ZnO nanomaterials.