Optoelectronic characteristics of transparent CU₂O films spin-coated on glass substrates

Cu₂O nanoparticles-based films are fabricated by spin-coating on glass substrates and their optoelectronic characteristics are investigated in this study. The Cu₂O films are nearly all-transparent as high as 98% in a wavelength range from 400 nm to 900 nm and three exciton peaks associated with the subleveis in the conduction band are observed at the wavelengths shorter than 400 nm in the absorption spectrum. Under the illumination of the 325 nm wavelength light, the photocurrent efficiency of the Cu₂O film is 1.8xl05 μA/W at a voltage of 2.5 V in air.