Abstract

Subject of study. The paper considers the results of studies on the influence of the power density of continuous-wave laser emission on the optical and electrical characteristics of ZnO thin films with silver nanoparticles. Aim of study. The aim is improving the photoelectric characteristics of ZnO:Ag films by laser treatment to increase the efficiency of ultraviolet radiation photodetection. Method. The properties of ZnO:Ag films are modified using focused radiation with a wavelength of 405 nm in the scanning mode. The films are examined using optical and electron microscopy. Electrical resistance, dark current, and photocurrent arising from exposure to radiation with a wavelength of 343 nm are measured using a multimeter. Main results. It was deduced that the ratio of the photocurrent to dark current after exposure to radiation with a power density of 16W/cm² increased from 4.8 to 7.4. The plasmon characteristics of the composite film changed, and the plasmon resonance peak shifted between 580 nm and 480 nm with increasing power density. The chemical composition of the film changed insignificantly after laser exposure. In this case, the film acquired a porous structure as the power density increased. Practical significance. The results obtained can be used to improve the efficiency of ultraviolet laser or solar radiation photodetectors based on ZnO:Ag films.

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