The impact of Au-decorated TiO2 nanoparticles on high performance and low 1/f noise in UV photodetector

In this study, a high-performance ultraviolet photodetector (UVPD) was elaborated using Cu/Au/TiO2/InGa structure. The chemically synthesized TiO2 nanoparticles (NPs) decorated with plasmonic Au NPs were prepared using the solvothermal synthesis route. Different characterization techniques in particular X-ray diffraction, transmission electron microscopy, high-resolution TEM, selected area electron diffraction, energy-dispersive X-ray fluorescence, diffuse reflectance, and photoluminescence are employed in this research. The dielectric characteristics have been emphasized the frequency and bias voltage effects on electric responses through dielectric measurement. The results revealed that Au-decorated TiO2 NPs present a giant permittivity and low dielectric loss. It was found that nanocomposites exhibited obvious photocurrent responses under illumination. The performance of our device was investigated by exposing it to a laser illumination wavelength of 375nm and at − 1 V. Under an intensity of 7.6mW, our UVPD exhibited a high responsivity of about 100A/W and a huge detectivity of 3.5 × 1014 Jones leads to a low noise equivalent power of 3.44 × 10–13 W.Hz−1/2. Furthermore, the rise time/the recovery time were 0.96 and 9.6 s, respectively. These results indicate that the Au-decorated TiO2 possesses significant photoelectric properties which can be exploited for the prospective photodetection application.