A modified spray pyrolysis technique is used for preparing α‐MoO₃ thin films after subsequent heat treatment at a relatively low temperature. The spray parameters are selected through a wide variety of elaboration conditions for best photochromic features. Different numbers of spraying and drying cycles are performed to investigate the thickness effect on the structural, morphological, optical, electrical, and photo‐electrical properties of the nanostructured α‐MoO₃ films. These film samples are characterized by X‐ray diffraction (XRD) and scanning electron microscopy (SEM), and thus the film thickness effect is elucidated and correlated to the crystallite shape and size. The SEM micrographs show fibrous‐reticulated morphology for all the film samples investigated here. The photochromic properties of α‐MoO₃ sprayed thin films are investigated by measuring the transmission spectra before and after UV‐light exposure. The changes in the optical transmission of these film samples are monitored for different exposure times. The UV exposure time effect as well as the thickness effect on the photochromic response of the film samples is investigated and discussed based on the particle size analysis. The photosensitivity is evaluated in various illumination levels to elucidate the carrier transport in the α‐MoO₃ films and to determine the type of the recombination processes in these films.

中文翻译：

---

改性喷雾热解法制备纤维网状α-MoO3薄膜的光致变色响应和稳态光电导

一种改进的喷雾热解技术被用于制备α-的MoO _3层以相对低的温度下随后的热处理后的薄膜。喷涂参数可通过多种加工条件进行选择，以获得最佳的光致变色特性。进行喷雾和干燥周期的不同数目来研究在纳米结构化的结构，形态，光，电，和光电特性的厚度影响α-的MoO ₃电影。这些薄膜样品通过X射线衍射（XRD）和扫描电子显微镜（SEM）进行表征，因此可以阐明薄膜厚度效应并将其与微晶形状和尺寸相关。SEM显微照片显示了此处研究的所有薄膜样品的纤维网状形态。α-的MoO的光致变色性质₃通过测量紫外线照射前后的透射光谱来研究喷涂的薄膜。对于不同的曝光时间，对这些薄膜样品的光学透射率的变化进行监测。基于粒径分析，研究并讨论了紫外线对时间的影响以及厚度对膜样品光致变色响应的影响。光敏性在各种照明等级进行评估，以阐明在α的MoO载流子传输_3层薄膜，并确定在这些膜中的重组过程的类型。