Solar cell and method for producing same

A method for producing a solar cell, comprising the steps of:

• (a) forming a first electrode;
• (b) forming at least a perovskite layer on the first electrode by:
• (b1) applying thereon at least one member selected from the group consisting of a metal halide (B1) and an organometal halide (B2), and
• (b2) applying thereon an organohalide (C), which is an alkyl ammonium halide,
• wherein steps (b1) and (b2) may be performed in any order;
• and
• (c) forming a second electrode on the perovskite layer,
• wherein the at least one member selected from the group consisting of the metal halide (B1) and the organometal halide (B2) is applied to overlap a region to which the organohalide (C) is applied, and further protrudes outward from an entire periphery of the region to which the organohalide (C) is applied and forms a side-surface-protecting layer surrounding an entire periphery of the perovskite layer, or
• the organohalide (C) is applied to overlap a region to which the at least one member selected from the group consisting of the metal halide (B1) and the organometal halide (B2) is applied, and further protrudes outward from an entire periphery of the region to which the at least one member selected from the group consisting of the metal halide (B1) and the organometal halide (B2) is applied and forms the side-surface-protecting layer surrounding the entire periphery of the perovskite layer, and
• wherein the side-surface-protecting layer has a width of 0.5 mm or more outside the periphery of the perovskite layer.