The invention relates to a method for producing a photoconductive flexible thin-film composite material for broadband photodetectors with a variable shape.
The method for producing a flexible photoconductive thin-film composite material based on zinc oxide and nanocellulose includes multiple application of a solution of zinc compounds to a prepared flexible polymer film with drying after each application to form a zinc oxide seed layer. According to the invention, a flexible polyimide film is used as a polymer film. A layer of zinc oxide nanoparticles is deposited on the prepared film with a formed zinc oxide seed layer by the method of sequential adsorption and ionic layer reaction with 100-300 cycles. Vacuum annealing is performed at a temperature of 250-400°C and a transparent layer of nanocellulose from non-woody plant raw materials is applied. The resulting composite is photosensitive in the ultraviolet, visible and near infrared light range, and the maximum photocurrent density is Jph 11±1 μA/cm2.
The invention provides for the production of a flexible photoconductive thin-film composite material, which, with significant flexibility, has reliable adhesion of the film to the layers of the material that generates the photocurrent, is protected from the influence of gases of the external environment and ensures the generation of photocurrent in the visible and adjacent ranges.