Solar-blind photodetectors have received increasing attention due to their widely applications in military and civil aspects. However, most of the photodetectors exhibit low detection ability for weak ultraviolet light signal, and the forewarning of weak ultraviolet radiation is important for the immune system of humans. Herein, the self-powered photodetector based on $\beta $ -Ga₂O₃/NiO heterojunction with an ultralow dark current (1.09 nA at −15 V) has been fabricated, and the synthesized platinum (Pt) nanoparticles (NPs) are used for surface modification of the device. The obtained devices with Pt NPs exhibit a large ${I}_{\text {photo}}/{I}_{\text {dark}}$ ratio of 9153, an excellent detectivity of $4.2\times 10^{9}$ Jones, an ultrahigh linear dynamic range of 79 dB, and a high responsivity of 4.27 mA/W, with respective enhancements over 4476%, 2220%, 71.7%, and 2442% compared to the pristine device, respectively. These results indicated that the device has the excellent ability for weak ultraviolet light signal detection, and the enhanced performance can be attributed to the Pt NPs, which can remarkably enhance the generation of photogenerated carriers via the formation of the local electric field and the local surface plasmon resonance effect. The experiment provides an effective method for fabricating high-performance solar-blind photodetector.

中文翻译：

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通过 Pt 纳米粒子的表面等离子体效应改善自供电 β-Ga₂O₃/NiO 异质结紫外光电探测器的光响应性能

日盲光电探测器因其在军事和民用方面的广泛应用而受到越来越多的关注。然而，大多数光电探测器对弱紫外光信号的检测能力较低，对弱紫外辐射的预警对人体免疫系统具有重要意义。在此，自供电光电探测器基于 $\beta $ -Ga ₂ O ₃ /NiO 异质结具有超低暗电流（-15 V 下为 1.09 nA），合成的铂 (Pt) 纳米粒子 (NPs) 用于器件的表面改性。获得的带有 Pt NPs 的器件表现出很大的 ${I}_{\text {photo}}/{I}_{\text {dark}}$ 9153的比率，出色的检测能力 $4.2\乘以 10^{9}$ Jones，具有 79 dB 的超高线性动态范围和 4.27 mA/W 的高响应度，与原始设备相比，分别提高了 4476%、2220%、71.7% 和 2442%。这些结果表明该器件具有优异的弱紫外光信号检测能力，其增强的性能可归因于 Pt NPs，它可以通过局部电场和局部表面的形成显着增强光生载流子的产生。等离子共振效应。该实验为制造高性能日盲光电探测器提供了一种有效的方法。