Provided is a method for manufacturing a solar cell including: a) forming an electron transport layer on a first electrode; b) forming a light absorber by applying a light absorber solution as a solution for forming a light absorber containing an organic-metal halide having a perovskite structure, the light absorber solution containing an organic halide and a metal halide dissolved therein so as to have a non-stoichiometric ratio based on the organic-metal halide; c) forming a hole conduction layer by applying and drying a hole transport solution in which an organic hole transport material is dissolved; and d) forming a second electrode, which is a counter electrode of the first electrode, on the hole conduction layer.