Photo energy transformation catalysts and methods for fabricating the same are provided. The method includes mixing a solution containing a positive valence element of Group IB, a solution containing a positive valence element of Group IIIA, and a solution containing a negative valence element of Group VIA to obtain a composition and forming a film from the composition by liquid phase deposition, wherein the film contains compounds including the elements of Group IB, Group IIIA, and Group VIA.