NOVELTY - The method for fabricating an electrically active film based on multilayer that is useful in semiconductor device e.g. solar cell, comprises printing a layer of one of the flowable printing compositions onto a substrate, performing an etch (116) on the printed layer, and annealing the printed layer to form a continuous thin film. The semiconductor device is produced by adding electrically conductive superstate and external contacts to the film. Each of the printing compositions comprises a different dispersion of prefabricated nanoparticles of specific elemental composition.    USE - The method is useful for fabricating an electrically active film based on multilayer, which is useful in semiconductor device e.g. solar cell.    ADVANTAGE - The method is capable of effectively and reliably fabricating a high-efficiency electrically active film based on multilayer with improved control over the electrical characteristics thus reducing the cost of the semiconductor device.    DETAILED DESCRIPTION - The method for fabricating an electrically active film based on multilayer that is useful in semiconductor device e.g. solar cell, comprises printing a layer of one of the flowable printing compositions onto a substrate, performing an etch (116) on the printed layer, and annealing the printed layer to form a continuous thin film. The semiconductor device is produced by adding electrically conductive superstate and external contacts to the film. Each of the printing compositions comprises a different dispersion of prefabricated nanoparticles of specific elemental composition, and has an average size of less than 100 nm. A thickness of the printed layer is smaller than 1 mu m. The printing compositions are suspensions and solutions. The printing step is performed by inkjet printing, pneumatic spraying, screen printing, pad printing, laser printing, dot matrix printing, thermal printing, lithography or three dimensional printing. Some of the printing compositions contain the same types of nanoparticles in different proportions. The annealed layer creates a concentration gradient of material through the film. A first set of nanoparticles comprises or consists of CuIn1-xGaxSe2, where 0 less than or equal to x less than or equal to 1 and x varies through the printing compositions. The nanoparticles have a size of less than 20 nm and a low size dispersity. The thin film comprises a semiconductor, and interacts electrically with the substrate. An INDEPENDENT CLAIM is included for a flowable printing composition.    DESCRIPTION OF DRAWING(S) - The diagram shows a flow diagram of a method to fabricate a film by successive printing and annealing.    Method to manufacture a thin film (100)    Choose printing composition (112)    Deposit layer of printing composition (114)    Etch (116)    Anneal. (118)