Effect of preparation temperature of titanium dioxide deposited on FTO glass on the UV photoresponse of photodetectors.

Abstract

In this study, titanium dioxide (TiO₂) nanocomposite membranes were prepared Installation on FTO bases by hydrothermal method and at high temperatures  (150^OC , 160^OC,170^OC and 180^OC )  by holding the titanium dioxide concentration constant at 0.5 ml and time  Constant deposition for 4h. These films were prepared by adding 0.5 ml. Of titanium butoxide (TiO₂), 20 ml of hydrochloric acid, and 20 ml of deionized water. Heat treatment was carried out at 450 ^OC for two hours , UV tests were conducted on FTO samples (T1, T2, T3 and T4) at different temperatures, and the absorbance was studied and the energy gaps of the samples were calculated. XRD examinations also showed the peaks of each model, FESEM images also showed the shapes of nanorods for all models. Using a photoluminescence device, it was found that the photoluminescence value was concentrated at (415 – 405 nm) in the samples prepared with TiO₂ , and its intensity was observed to decrease with increasing temperature. FTO/TiO2 photodetectors prepared at different temperatures, where the sensitivity (140 %, 175%,315.4% and 589%  ) and photoresponse (0.007,0.014, 0.041and 0.171 A/W ) to temperatures (150^OC , 160^OC ,170^OC and 180^OC )  respectively. These parameters were calculated using ultraviolet light with a wavelength of 385 nm and an intensity of 0.05 mw/cm2 at room temperature , applying a bias voltage of )1volt (, an on time of 20 seconds, and an off time of 20 seconds. These rays were shone perpendicularly to the photodetectors at a distance of 5 cm. In this study, we will focus on the best results resulting from the measurements