Solar power generation module and its preparation method, and preparation method for perovskite device

A preparation method for a perovskite device, comprising:

• forming a first electrode layer and a second electrode layer on a substrate;
• wherein the first electrode layer comprises a first bus-electrode layer and a second bus-electrode layer located in a functional region and sequentially arranged at an interval along a first direction, and a first light-absorption electrode layer, multiple second light-absorption electrode layers and a third light-absorption electrode layer located in a light absorption region and sequentially arranged at intervals along the first direction;
• the first light-absorption electrode layer is connected to the first bus-electrode layer, and the third light-absorption electrode layer is connected to the second bus-electrode layer;
• the second electrode layer is configured for forming a positioning structure;
• the first direction is parallel to the substrate;
• forming multiple light absorption units that are sequentially arranged at intervals along the first direction on the first light-absorption electrode layer, the multiple second light-absorption electrode layers and the third light-absorption electrode layer;
• wherein at least one light absorption unit is in contact with a surface of each of two adjacent light-absorption electrode layers facing away from the substrate;
• each of the multiple light absorption units comprises a first sidewall and a second sidewall opposite to each other along the first direction, as well as a third sidewall and a fourth sidewall opposite to each other along a second direction, wherein the second direction is parallel to the substrate and perpendicular to the first direction;
• the light absorption region and the functional region are sequentially arranged along the second direction;
• forming a third electrode layer on a surface of the first bus-electrode layer facing away from the substrate;
• the first bus-electrode layer, the second bus-electrode layer, and the third electrode layer constituting a bus electrode;
• and
• forming multiple fourth electrode layers and multiple fifth electrode layers on surfaces of the multiple light absorption units;
• wherein each light absorption unit corresponds to one fourth electrode layer and one fifth electrode layer, each fourth electrode layer is located on a side of a corresponding light absorption unit facing away from the substrate, each fifth electrode layer covers the first sidewall or the fourth sidewall of the corresponding light absorption unit, and each fourth electrode layer is connected to the second light-absorption electrode layer or the third electrode layer via a corresponding fifth electrode layer.