The method of making a compound semiconductor thin film and the compound semiconductor thin film includes a solar cell

Feature of the present invention includes the steps of: containing 50 mass% of printing ink or coated film of fabricating a compound semiconductor compound as an amorphous nanoparticles, a compound semiconductor film forming step; and the compound the semiconductor film is mechanically applying pressure step; and a step of heat-treating the compound semiconductor film, a compound semiconductor thin film is formed.