NOVELTY - A solar cell comprises two electrodes (11, 21) facing each other, light absorption layer, and lead electrode. The light absorption layer is formed on the first electrode. The light absorption layer has a first edge proceeding in a first direction and a second edge proceeding in a second direction crossing the first direction. The lead electrode is formed on the first electrode in the first direction such that the lead electrode is spaced apart from the light absorption layer.    USE - The solar cell is useful for use in constructing outer wall for buildings or greenhouses.    ADVANTAGE - The solar cell has high energy efficiency, has optimized design for serving to generate excited electrons, and has enhanced photoelectric conversion efficiency of solar cell.    DETAILED DESCRIPTION - The length of the first edge of the light absorption layer proceeding in the first direction divide by the length of the second edge of the light absorption layer proceeding in the second direction crossing the first direction is greater than 1.3-less than 12.5, preferably greater than 1.3-less than 5. An area ratio of the light absorption layer to the first electrode is 0.05-1. The lead electrode is placed adjacent to an edge of the first electrode. The solar cell includes lead electrode formed on the second electrode in the first direction. The light absorption layer comprises a porous film (13) having a dye adsorbed thereon. The porous film comprises metal oxide particles. The light absorption layer includes conductive micro-particles and light-scattering particles. The solar cell includes first substrate supporting the first electrode and a second substrate supporting the second electrode. The second electrode comprises a transparent electrode and catalyst electrode. The solar cell includes electrolyte.    DESCRIPTION OF DRAWING(S) - The figure shows cross sectional view of the solar cell.    Substrates (10, 20)    Two electrodes (11, 21)    Porous film (13)    Adsorbed dye (15)    Adhesive (41)