Optics and Photonics Society of Iran

In this work, effect of thermal annealing on optical response of the zinc oxide nanoparticles film is investigated after thermal annealing. The film is deposited using centrifuge coating method from the solution of the zinc oxide nanoparticles dispersed in the deionized water. The samples is characterized by UV-visible absorption spectrometer and X-ray diffraction patterns (XRD). The UV-visible results show that exciton absorption edge has been red shifted. The XRD results relating to films indicate hexagonal crystal structure has stayed intact. The DC current of annealed films shows extreme change under laser irradiation at the wavelength 405 nm. Our results show that the intrinsic defects such as oxygen vacancies play important role in improving the electrical properties of the films under laser illumination. The measured photoelectrical properties of the zinc oxide nanoparticles films makes them good candidate in UV detectors.