NOVELTY - The method comprises: forming a light absorption precursor layer on a first substrate (102); conducting a thermal process to the light absorption precursor layer to form a light absorption layer (104), where the light absorption layer comprises a first light absorption layer (104a) and a second light absorption layer (104b), and the first absorption layer is formed on the first substrate; forming a second substrate on the second light absorption layer; and removing the first substrate to expose a surface of the first light absorption layer.    USE - The method is useful for fabricating a solar cell (claimed).    ADVANTAGE - The method is capable of economically and simply fabricating the solar cell.    DETAILED DESCRIPTION - The method comprises: forming a light absorption precursor layer on a first substrate (102); conducting a thermal process to the light absorption precursor layer to form a light absorption layer (104), where the light absorption layer comprises a first light absorption layer (104a) and a second light absorption layer (104b), and the first absorption layer is formed on the first substrate; forming a second substrate on the second light absorption layer; removing the first substrate to expose a surface of the first light absorption layer; forming a zinc sulfide (ZnS) layer on the surface of the first light absorption layer; and forming a transparent conducting oxide (TCO) layer on the ZnS layer. The first substrate comprises glass, polymer substrate and/or metal substrate. The step of forming the light absorption layer comprises a spin coating method, bar coating method, dip coating method, roll coating method, spray coating method, gravure coating method, ink jet printing method, slot coating method or blade coating method. The step of conducting the thermal process comprises: placing the first substrate in an atmospheric environment containing Group VIA gas to conduct the thermal process. The thermal process is conducted at a temperature of 450-550 degrees C for 10-60 minutes. An average particle size of the first light absorption layer is 50-500 nm. An average particle size of the second light absorption layer is 1-10 mu m. An energy gap of the second light absorption layer is smaller than that of the first light absorption layer. The second substrate comprises glass, polymer substrate and/or metal substrate. The step of forming the second substrate on the second light absorption layer comprises: coating a conductive glue on the second light absorption layer; and forming the second substrate on the conductive glue.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic cross sectional view of fabricating a solar cell.    First substrate (102)    Light absorption layer (104)    First light absorption layer (104a)    Second light absorption layer. (104b)