## 1 Introduction  
Recently, UV sensors/photodetectors have drawn growing attention due to their wide applications in environmental safety, biological research, medicine, gas sensors, optical communication, astronomical studies, space exploration, and so forth [1]. Lately, sensory technology has evolved and is constantly growing to improve the quality of life and environmental protection. Hence, ZnO [2], TiO\({}_{2}\)[3], CuO/Cu\({}_{2}\)O [4], SnO/SnO\({}_{2}\)[5], and VO\({}_{2}\)/V\({}_{2}\)O\({}_{5}\)[6] are some examples of metal oxides and have been extensively studied for use as high-performance UV photodetectors [7]. These types of materials can have different structures, from nanowires to nanospheres, which have a direct influence on their performance in detection applications. The literature data present that some characteristics, such as composition, crystal quality, morphology, particle size and distribution, surface area, porosity, and bandwidth have influenced the performances of the catalysts' photoactivity [8]. Among the different metal oxides, TiO\({}_{2}\) is one of the most studied semiconductors because of its interesting properties and promising applications in solar cells [9], gas sensors [10], pharmaceutical applications [11], photocatalysis [12], batteries [13], and UV detectors [14]. UV detectors can be used in a wide range of detection applications, such as emitter calibration, satellite communications, chemical and biological analyses, flame detection and astronomical studies [15]. Recently, TiO\({}_{2}\), which is considered to be highly photoactive and stable under UV irradiation due to its band gap, has been applied to the most commonly used UV sensors. In terms of synthesis, TiO\({}_{2}\) UV photodetectors can be fabricated by many methods such as sol-gel, thermal hydrolysis, thermal decomposition, micro-emulsion, chemical vapor deposition (CVD), potentiostatic anodization or radio-frequency magnetron sputtering techniques [16]. Many researchers have focused on the coupling of semiconductor materials, based on their unique properties, namely that two types of semiconductors with different energy band structures can improve the separating results of charges. The heterojunction of TiO\({}_{2}\) with numerous semiconductors, including CdTe [17], CuI [18], Cu\({}_{2}\)O [19], MoS\({}_{2}\)[20], and ZnO [21], was studied and an enhancement in both the photoelectrochemical properties and the photovoltaic or photocatalytic performance was observed. Lately, the oxides CuMO\({}_{2}\) (M = Al, Ga, Fe, Mn, Cr) have attracted researchers' attention because of their wide band gaps and fast-hole diffusion coefficients. These binary metal oxides have been vastly used in many areas, including the production of hydrogen, storage of oxygen, water splitting, supercapacitors, and sensors. [PERSON] et al. have obtained a CuGaO\({}_{2}\) film that was deposited on a \(\beta\)-Ga\({}_{2}\)O\({}_{3}\) substrate by using a reactive deposition epitaxy technique. The results that were achieved allowed them to more efficiently design a \(\beta\)-Ga\({}_{2}\)O\({}_{3}\)-based wide band gap-oxide heterojunction for advanced UV applications [22]. [PERSON] et al., by using the sputtering deposition method, have developed a heterojunction of thin films comprised of Al-doped ZnO and (Mg, N)-doped CuCrO\({}_{2}\). These materials have a wide band gap that makes them transparent in visible light but also good UV-absorbers [23]. [PERSON] et al. have prepared CuCrO\({}_{2}\) nanoparticle-decorated SnO\({}_{2}\) nanofiber composites as novel \(p\)-\(n\) heterostructured semiconductor photocatalysts for the degradation of organic pollutants in wastewater [24]. Based on the literature data, all photodetectors are made of nanostructures that are more promising for manufacturing and practical applications compared to simple thin \(p\)-\(n\) films [23].