Solution-processed ultraviolet (UV) photodetectors with high performance have great potential in many practical applications. In this paper, quantum-sized zinc oxide (ZnO) nanoparticles (~ 5.5 nm) were synthesized by a simple and low-cost chemical reflux method. The crystalline structure, morphologies, and optical properties of ZnO nanoparticles were investigated in detail. The results showed that the as-synthesized ZnO nanoparticles were wurtzite-structured (hexagonal) ZnO and had specific surface area as high as 68.3 m²/g, the ZnO nanoparticulate thin films had a strong absorption in UV region and optical bandgap of 3.28 eV. Furthermore, an UV photodetector was fabricated using the as-prepared ZnO nanoparticles, the device revealed stable, rapid and repeatable photoresponse towards 365 nm UV light, the sensitivity (S), responsivity (R), rise time (T_r), and decay time (T_d) of the photodetector was 11.4 at − 0.25 V, 22.1 A/W at 3 V, 1.8 s and 47.2 s, respectively. In addition, the photoresponsive mechanism of this UV photodetector was systematically illuminated according to the adsorption-photodesorption theory of oxygen in ZnO nanoparticles.

在许多实际应用中，具有高性能的固溶处理紫外（UV）光电探测器具有巨大的潜力。在本文中，通过一种简单且低成本的化学回流方法合成了量子尺寸的氧化锌（ZnO）纳米粒子（〜5.5 nm）。详细研究了ZnO纳米粒子的晶体结构，形貌和光学性质。结果表明，合成后的ZnO纳米颗粒为纤锌矿型（六方）ZnO，比表面积高达68.3 m ^2。/ g，ZnO纳米颗粒薄膜在UV区的吸收很强，光学带隙为3.28 eV。此外，使用所制备的ZnO纳米粒子制造了一个紫外线光电探测器，该装置显示出对365 nm紫外线的稳定，快速和可重复的光响应，灵敏度（S），响应度（R），上升时间（T _r）和衰减在-0.25 V时，光电探测器的时间（T _d）分别为11.4，在3 V时为22.1 A / W，1.8 s和47.2 s。此外，根据氧气在ZnO纳米粒子中的吸附-光解吸原理，系统地阐明了该紫外线光电探测器的光响应机理。