NOVELTY - The method comprises preparing an ink composition including a metal precursor comprising a chalcogen element and a solvent, applying the ink composition as a precursor phase on a substrate (50) using a solution process, photo-sintering the applied ink composition, and heat-treating the applied ink composition at a temperature of 50-200 degrees C for removing a solvent in the ink composition. The ink composition further comprises a solution stabilizer. The photo-sintering step is performed using a white short pulse. The white short pulse lasts and pauses for 0.1-500 ms.    USE - The method is useful for manufacturing a light-absorption layer for a thin film solar cell (claimed).    ADVANTAGE - The method is capable of effectively manufacturing the light-absorption layer at a low temperature without any damage and with high uniformity and excellent light absorption rate thus improving efficiency of the thin film solar cell.    DETAILED DESCRIPTION - The method comprises preparing an ink composition including a metal precursor comprising a chalcogen element and a solvent, applying the ink composition as a precursor phase on a substrate (50) using a solution process, photo-sintering the applied ink composition, and heat-treating the applied ink composition at a temperature of 50-200 degrees C for removing a solvent in the ink composition. The ink composition further comprises a solution stabilizer. The photo-sintering step is performed using a white short pulse. The white short pulse lasts and pauses for 0.1-500 ms, and has pulse energy of 5-200 J/cm2 and a pulse number of 1-99. The metal precursor including the chalcogen element is an inorganic salt. INDEPENDENT CLAIMS are included for:    (1) a method of manufacturing a thin film solar cell; and    (2) a thin film solar cell.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a thin film solar cell.    Transparent electrode (10)    Buffer layer (20)    Light-absorption layer (30)    Rear electrode (40)    Substrate. (50)